[pypy-commit] pypy cpyext-ext: hg merge default

amauryfa pypy.commits at gmail.com
Tue Dec 29 20:30:34 EST 2015


Author: Amaury Forgeot d'Arc <amauryfa at gmail.com>
Branch: cpyext-ext
Changeset: r81495:270c041cd532
Date: 2015-12-30 00:38 +0100
http://bitbucket.org/pypy/pypy/changeset/270c041cd532/

Log:	hg merge default

diff --git a/pypy/module/_cffi_backend/cglob.py b/pypy/module/_cffi_backend/cglob.py
--- a/pypy/module/_cffi_backend/cglob.py
+++ b/pypy/module/_cffi_backend/cglob.py
@@ -3,6 +3,7 @@
 from pypy.interpreter.typedef import TypeDef
 from pypy.module._cffi_backend.cdataobj import W_CData
 from pypy.module._cffi_backend import newtype
+from rpython.rlib import rgil
 from rpython.rlib.objectmodel import we_are_translated
 from rpython.rtyper.lltypesystem import lltype, rffi
 from rpython.translator.tool.cbuild import ExternalCompilationInfo
@@ -26,7 +27,9 @@
             if not we_are_translated():
                 FNPTR = rffi.CCallback([], rffi.VOIDP)
                 fetch_addr = rffi.cast(FNPTR, self.fetch_addr)
+                rgil.release()
                 result = fetch_addr()
+                rgil.acquire()
             else:
                 # careful in translated versions: we need to call fetch_addr,
                 # but in a GIL-releasing way.  The easiest is to invoke a
diff --git a/pypy/module/_cffi_backend/ctypefunc.py b/pypy/module/_cffi_backend/ctypefunc.py
--- a/pypy/module/_cffi_backend/ctypefunc.py
+++ b/pypy/module/_cffi_backend/ctypefunc.py
@@ -423,7 +423,9 @@
             exchange_offset += rffi.getintfield(self.atypes[i], 'c_size')
 
         # store the exchange data size
-        cif_descr.exchange_size = exchange_offset
+        # we also align it to the next multiple of 8, in an attempt to
+        # work around bugs(?) of libffi (see cffi issue #241)
+        cif_descr.exchange_size = self.align_arg(exchange_offset)
 
     def fb_extra_fields(self, cif_descr):
         cif_descr.abi = self.fabi
diff --git a/pypy/module/cpyext/slotdefs.py b/pypy/module/cpyext/slotdefs.py
--- a/pypy/module/cpyext/slotdefs.py
+++ b/pypy/module/cpyext/slotdefs.py
@@ -4,8 +4,7 @@
 
 from rpython.rtyper.lltypesystem import rffi, lltype
 from pypy.module.cpyext.api import (
-    cpython_api, generic_cpy_call, PyObject, Py_ssize_t, Py_TPFLAGS_CHECKTYPES,
-    CANNOT_FAIL)
+    cpython_api, generic_cpy_call, PyObject, Py_ssize_t, Py_TPFLAGS_CHECKTYPES)
 from pypy.module.cpyext.typeobjectdefs import (
     unaryfunc, wrapperfunc, ternaryfunc, PyTypeObjectPtr, binaryfunc,
     getattrfunc, getattrofunc, setattrofunc, lenfunc, ssizeargfunc, inquiry,
@@ -387,7 +386,7 @@
             return
 
         @cpython_api([PyObject, PyObject], PyObject,
-                     error=CANNOT_FAIL, external=True)
+                     external=True)
         @func_renamer("cpyext_tp_getattro_%s" % (typedef.name,))
         def slot_tp_getattro(space, w_self, w_name):
             return space.call_function(getattr_fn, w_self, w_name)
diff --git a/pypy/module/cpyext/test/test_typeobject.py b/pypy/module/cpyext/test/test_typeobject.py
--- a/pypy/module/cpyext/test/test_typeobject.py
+++ b/pypy/module/cpyext/test/test_typeobject.py
@@ -416,15 +416,26 @@
                      return NULL;
                  }
                  PyObject *name = PyString_FromString("attr1");
-                 PyIntObject *attr1 = obj->ob_type->tp_getattro(obj, name);
-                 if (attr1->ob_ival != value->ob_ival)
+                 PyIntObject *attr = obj->ob_type->tp_getattro(obj, name);
+                 if (attr->ob_ival != value->ob_ival)
                  {
                      PyErr_SetString(PyExc_ValueError,
                                      "tp_getattro returned wrong value");
                      return NULL;
                  }
                  Py_DECREF(name);
-                 Py_DECREF(attr1);
+                 Py_DECREF(attr);
+                 name = PyString_FromString("attr2");
+                 attr = obj->ob_type->tp_getattro(obj, name);
+                 if (attr == NULL && PyErr_ExceptionMatches(PyExc_AttributeError))
+                 {
+                     PyErr_Clear();
+                 } else {
+                     PyErr_SetString(PyExc_ValueError,
+                                     "tp_getattro should have raised");
+                     return NULL;
+                 }
+                 Py_DECREF(name);
                  Py_RETURN_TRUE;
              '''
              )
@@ -647,7 +658,7 @@
                 IntLikeObject *intObj;
                 long intval;
 
-                if (!PyArg_ParseTuple(args, "i", &intval))
+                if (!PyArg_ParseTuple(args, "l", &intval))
                     return NULL;
 
                 IntLike_Type.tp_as_number = &intlike_as_number;
@@ -667,7 +678,7 @@
                 IntLikeObjectNoOp *intObjNoOp;
                 long intval;
 
-                if (!PyArg_ParseTuple(args, "i", &intval))
+                if (!PyArg_ParseTuple(args, "l", &intval))
                     return NULL;
 
                 IntLike_Type_NoOp.tp_flags |= Py_TPFLAGS_CHECKTYPES;
diff --git a/rpython/annotator/signature.py b/rpython/annotator/signature.py
--- a/rpython/annotator/signature.py
+++ b/rpython/annotator/signature.py
@@ -100,6 +100,7 @@
         self.argtypes = argtypes
 
     def __call__(self, funcdesc, inputcells):
+        from rpython.rlib.objectmodel import NOT_CONSTANT
         from rpython.rtyper.lltypesystem import lltype
         args_s = []
         from rpython.annotator import model as annmodel
@@ -115,6 +116,9 @@
                 args_s.append(s_input)
             elif argtype is None:
                 args_s.append(inputcells[i])     # no change
+            elif argtype is NOT_CONSTANT:
+                from rpython.annotator.model import not_const
+                args_s.append(not_const(inputcells[i]))
             else:
                 args_s.append(annotation(argtype, bookkeeper=funcdesc.bookkeeper))
         if len(inputcells) != len(args_s):
diff --git a/rpython/jit/backend/arm/regalloc.py b/rpython/jit/backend/arm/regalloc.py
--- a/rpython/jit/backend/arm/regalloc.py
+++ b/rpython/jit/backend/arm/regalloc.py
@@ -804,7 +804,7 @@
         base_loc = self.make_sure_var_in_reg(boxes[0], boxes)
         ofs = boxes[1].getint()
         value_loc = self.make_sure_var_in_reg(boxes[2], boxes)
-        size = abs(boxes[3].getint())
+        size = boxes[3].getint()
         ofs_size = default_imm_size if size < 8 else VMEM_imm_size
         if check_imm_arg(ofs, size=ofs_size):
             ofs_loc = imm(ofs)
@@ -849,7 +849,7 @@
         index_loc = self.make_sure_var_in_reg(boxes[1], boxes)
         assert boxes[3].getint() == 1    # scale
         ofs = boxes[4].getint()
-        size = abs(boxes[5].getint())
+        size = boxes[5].getint()
         assert check_imm_arg(ofs)
         return [value_loc, base_loc, index_loc, imm(size), imm(ofs)]
 
diff --git a/rpython/jit/backend/llsupport/rewrite.py b/rpython/jit/backend/llsupport/rewrite.py
--- a/rpython/jit/backend/llsupport/rewrite.py
+++ b/rpython/jit/backend/llsupport/rewrite.py
@@ -126,11 +126,11 @@
     def emit_gc_store_or_indexed(self, op, ptr_box, index_box, value_box,
                                  itemsize, factor, offset):
         factor, offset, index_box = \
-                self._emit_mul_add_if_factor_offset_not_supported(index_box,
+                self._emit_mul_if_factor_offset_not_supported(index_box,
                         factor, offset)
         #
-        if factor == 1 and offset == 0:
-            args = [ptr_box, index_box, value_box, ConstInt(itemsize)]
+        if index_box is None:
+            args = [ptr_box, ConstInt(offset), value_box, ConstInt(itemsize)]
             newload = ResOperation(rop.GC_STORE, args)
         else:
             args = [ptr_box, index_box, value_box, ConstInt(factor),
@@ -153,18 +153,15 @@
         index_box = op.getarg(1)
         self.emit_gc_load_or_indexed(op, ptr_box, index_box, itemsize, 1, ofs, sign)
 
-    def _emit_mul_add_if_factor_offset_not_supported(self, index_box, factor, offset):
-        orig_factor = factor
-        # factor
-        must_manually_load_const = False # offset != 0 and not self.cpu.load_constant_offset
-        if factor != 1 and (factor not in self.cpu.load_supported_factors or \
-                            (not index_box.is_constant() and must_manually_load_const)):
-            # enter here if the factor is supported by the cpu
-            # OR the index is not constant and a new resop must be emitted
-            # to add the offset
-            if isinstance(index_box, ConstInt):
-                index_box = ConstInt(index_box.value * factor)
-            else:
+    def _emit_mul_if_factor_offset_not_supported(self, index_box,
+                                                 factor, offset):
+        # Returns (factor, offset, index_box) where index_box is either
+        # a non-constant BoxInt or None.
+        if isinstance(index_box, ConstInt):
+            return 1, index_box.value * factor + offset, None
+        else:
+            if factor != 1 and factor not in self.cpu.load_supported_factors:
+                # the factor is supported by the cpu
                 # x & (x - 1) == 0 is a quick test for power of 2
                 assert factor > 0
                 if (factor & (factor - 1)) == 0:
@@ -174,20 +171,13 @@
                     index_box = ResOperation(rop.INT_MUL,
                             [index_box, ConstInt(factor)])
                 self.emit_op(index_box)
-            factor = 1
-        # adjust the constant offset
-        #if must_manually_load_const:
-        #    if isinstance(index_box, ConstInt):
-        #        index_box = ConstInt(index_box.value + offset)
-        #    else:
-        #        index_box = ResOperation(rop.INT_ADD, [index_box, ConstInt(offset)])
-        #        self.emit_op(index_box)
-        #    offset = 0
-        return factor, offset, index_box
+                factor = 1
+            return factor, offset, index_box
 
-    def emit_gc_load_or_indexed(self, op, ptr_box, index_box, itemsize, factor, offset, sign, type='i'):
+    def emit_gc_load_or_indexed(self, op, ptr_box, index_box, itemsize,
+                                factor, offset, sign, type='i'):
         factor, offset, index_box = \
-                self._emit_mul_add_if_factor_offset_not_supported(index_box,
+                self._emit_mul_if_factor_offset_not_supported(index_box,
                         factor, offset)
         #
         if sign:
@@ -197,8 +187,8 @@
         optype = type
         if op is not None:
             optype = op.type
-        if factor == 1 and offset == 0:
-            args = [ptr_box, index_box, ConstInt(itemsize)]
+        if index_box is None:
+            args = [ptr_box, ConstInt(offset), ConstInt(itemsize)]
             newload = ResOperation(OpHelpers.get_gc_load(optype), args)
         else:
             args = [ptr_box, index_box, ConstInt(factor),
@@ -547,9 +537,8 @@
             ofs, size, sign = unpack_fielddescr(descrs.jfi_frame_depth)
             if sign:
                 size = -size
-            args = [ConstInt(frame_info), ConstInt(0), ConstInt(1),
-                    ConstInt(ofs), ConstInt(size)]
-            size = ResOperation(rop.GC_LOAD_INDEXED_I, args)
+            args = [ConstInt(frame_info), ConstInt(ofs), ConstInt(size)]
+            size = ResOperation(rop.GC_LOAD_I, args)
             self.emit_op(size)
             frame = ResOperation(rop.NEW_ARRAY, [size],
                                  descr=descrs.arraydescr)
@@ -560,9 +549,8 @@
             ofs, size, sign = unpack_fielddescr(descrs.jfi_frame_size)
             if sign:
                 size = -size
-            args = [ConstInt(frame_info), ConstInt(0), ConstInt(1),
-                    ConstInt(ofs), ConstInt(size)]
-            size = ResOperation(rop.GC_LOAD_INDEXED_I, args)
+            args = [ConstInt(frame_info), ConstInt(ofs), ConstInt(size)]
+            size = ResOperation(rop.GC_LOAD_I, args)
             self.emit_op(size)
             frame = self.gen_malloc_nursery_varsize_frame(size)
             self.gen_initialize_tid(frame, descrs.arraydescr.tid)
@@ -612,15 +600,12 @@
             descr = self.cpu.getarraydescr_for_frame(arg.type)
             assert self.cpu.JITFRAME_FIXED_SIZE & 1 == 0
             _, itemsize, _ = self.cpu.unpack_arraydescr_size(descr)
-            index = index_list[i] // itemsize # index is in bytes
-            # emit GC_LOAD_INDEXED
-            itemsize, basesize, _ = unpack_arraydescr(descr)
-            factor, offset, index_box = \
-                    self._emit_mul_add_if_factor_offset_not_supported(ConstInt(index),
-                            itemsize, basesize)
-            args = [frame, index_box, arg, ConstInt(factor),
-                    ConstInt(offset), ConstInt(itemsize)]
-            self.emit_op(ResOperation(rop.GC_STORE_INDEXED, args))
+            array_offset = index_list[i]   # index, already measured in bytes
+            # emit GC_STORE
+            _, basesize, _ = unpack_arraydescr(descr)
+            offset = basesize + array_offset
+            args = [frame, ConstInt(offset), arg, ConstInt(itemsize)]
+            self.emit_op(ResOperation(rop.GC_STORE, args))
 
         descr = op.getdescr()
         assert isinstance(descr, JitCellToken)
diff --git a/rpython/jit/backend/llsupport/test/test_rewrite.py b/rpython/jit/backend/llsupport/test/test_rewrite.py
--- a/rpython/jit/backend/llsupport/test/test_rewrite.py
+++ b/rpython/jit/backend/llsupport/test/test_rewrite.py
@@ -30,13 +30,26 @@
 
 class RewriteTests(object):
     def check_rewrite(self, frm_operations, to_operations, **namespace):
-        def trans_getarray_to_load(descr):
-            size = descr.basesize
-            if descr.is_item_signed():
-                size = -size
-            return ','.join([str(n) for n in [descr.itemsize,
-                                              descr.basesize,
-                                              size]])
+        def setfield(baseptr, newvalue, descr):
+            assert isinstance(baseptr, str)
+            assert isinstance(newvalue, (str, int))
+            assert not isinstance(descr, (str, int))
+            return 'gc_store(%s, %d, %s, %d)' % (baseptr, descr.offset,
+                                                 newvalue, descr.field_size)
+        def setarrayitem(baseptr, index, newvalue, descr):
+            assert isinstance(baseptr, str)
+            assert isinstance(index, (str, int))
+            assert isinstance(newvalue, (str, int))
+            assert not isinstance(descr, (str, int))
+            if isinstance(index, int):
+                offset = descr.basesize + index * descr.itemsize
+                return 'gc_store(%s, %d, %s, %d)' % (baseptr, offset,
+                                                     newvalue, descr.itemsize)
+            else:
+                return 'gc_store_indexed(%s, %s, %s, %d, %d, %s)' % (
+                    baseptr, index, newvalue,
+                    descr.itemsize, descr.basesize, descr.itemsize)
+        #
         WORD = globals()['WORD']
         S = lltype.GcStruct('S', ('x', lltype.Signed),
                                  ('y', lltype.Signed))
@@ -376,7 +389,7 @@
             gc_store(p1, 0, 5678, 8)
             p2 = nursery_ptr_increment(p1, %(tdescr.size)d)
             gc_store(p2, 0, 1234, 8)
-            gc_store(p1, %(tdescr.gc_fielddescrs[0].offset)s, 0, %(tdescr.gc_fielddescrs[0].offset)s)
+            %(setfield('p1', 0, tdescr.gc_fielddescrs[0]))s
             jump()
         """)
 
@@ -485,7 +498,7 @@
         """, """
         [i0]
         p0 = call_malloc_nursery_varsize(1, 1, i0, descr=strdescr)
-        gc_store_indexed(p0, 0, i0, 1, %(strlendescr.offset)s, %(strlendescr.field_size)s)
+        gc_store(p0, %(strlendescr.offset)s, i0, %(strlendescr.field_size)s)
         gc_store(p0, 0, 0, %(strlendescr.field_size)s)
         jump(i0)
         """)
@@ -611,19 +624,19 @@
                       %(strdescr.basesize + 16 * strdescr.itemsize + \
                         unicodedescr.basesize + 10 * unicodedescr.itemsize)d)
             gc_store(p0, 0,  %(strdescr.tid)d, %(tiddescr.field_size)s)
-            gc_store_indexed(p0, 0,  14, 1, %(strlendescr.offset)s, %(strlendescr.field_size)s)
+            gc_store(p0, %(strlendescr.offset)s, 14, %(strlendescr.field_size)s)
             gc_store(p0, 0,  0, %(strhashdescr.field_size)s)
             p1 = nursery_ptr_increment(p0, %(strdescr.basesize + 16 * strdescr.itemsize)d)
             gc_store(p1, 0,  %(unicodedescr.tid)d, %(tiddescr.field_size)s)
-            gc_store_indexed(p1, 0,  10, 1, %(unicodelendescr.offset)s, %(unicodelendescr.field_size)s)
+            gc_store(p1, %(unicodelendescr.offset)s, 10, %(unicodelendescr.field_size)s)
             gc_store(p1, 0,  0, %(unicodehashdescr.field_size)s)
             p2 = call_malloc_nursery_varsize(2, %(unicodedescr.itemsize)d, i2,\
                                 descr=unicodedescr)
-            gc_store_indexed(p2, 0,  i2, 1, %(unicodelendescr.offset)s, %(unicodelendescr.field_size)s)
+            gc_store(p2, %(unicodelendescr.offset)s, i2, %(unicodelendescr.field_size)s)
             gc_store(p2, 0,  0, %(unicodehashdescr.field_size)s)
             p3 = call_malloc_nursery_varsize(1, 1, i2, \
                                 descr=strdescr)
-            gc_store_indexed(p3, 0,  i2, 1, %(strlendescr.offset)s, %(strlendescr.field_size)s)
+            gc_store(p3, %(strlendescr.offset)s, i2, %(strlendescr.field_size)s)
             gc_store(p3, 0,  0, %(strhashdescr.field_size)s)
             jump()
         """)
@@ -636,7 +649,7 @@
         """, """
             [p1, p2]
             cond_call_gc_wb(p1, descr=wbdescr)
-            gc_store_indexed(p1, 0,  p2, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
+            gc_store(p1, %(tzdescr.offset)s, p2, %(tzdescr.field_size)s)
             jump()
         """)
 
@@ -650,7 +663,7 @@
         """, """
             [p1, i2, p3]
             cond_call_gc_wb(p1, descr=wbdescr)
-            gc_store_indexed(p1, i2, p3, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p1', 'i2', 'p3', cdescr))s
             jump()
         """)
 
@@ -671,7 +684,7 @@
             zero_array(p1, 0, 129, descr=cdescr)
             call_n(123456)
             cond_call_gc_wb(p1, descr=wbdescr)
-            gc_store_indexed(p1, i2, p3, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p1', 'i2', 'p3', cdescr))s
             jump()
         """)
 
@@ -693,7 +706,7 @@
             zero_array(p1, 0, 130, descr=cdescr)
             call_n(123456)
             cond_call_gc_wb_array(p1, i2, descr=wbdescr)
-            gc_store_indexed(p1, i2, p3, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p1', 'i2', 'p3', cdescr))s
             jump()
         """)
 
@@ -705,7 +718,7 @@
         """, """
             [p1, i2, p3]
             cond_call_gc_wb_array(p1, i2, descr=wbdescr)
-            gc_store_indexed(p1, i2, p3, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p1', 'i2', 'p3', cdescr))s
             jump()
         """)
 
@@ -725,7 +738,7 @@
             zero_array(p1, 0, 5, descr=cdescr)
             label(p1, i2, p3)
             cond_call_gc_wb_array(p1, i2, descr=wbdescr)
-            gc_store_indexed(p1, i2, p3, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p1', 'i2', 'p3', cdescr))s
             jump()
         """)
 
@@ -743,12 +756,12 @@
         size = interiorzdescr.arraydescr.itemsize
         self.check_rewrite("""
             [p1, p2]
-            setinteriorfield_gc(p1, 0, p2, descr=interiorzdescr)
+            setinteriorfield_gc(p1, 7, p2, descr=interiorzdescr)
             jump(p1, p2)
         """, """
             [p1, p2]
-            cond_call_gc_wb_array(p1, 0, descr=wbdescr)
-            gc_store_indexed(p1, 0, p2, %(scale)s, %(offset)s, %(size)s)
+            cond_call_gc_wb_array(p1, 7, descr=wbdescr)
+            gc_store(p1, %(offset + 7 * scale)s, p2, %(size)s)
             jump(p1, p2)
         """, interiorzdescr=interiorzdescr, scale=scale,
              offset=offset, size=size)
@@ -763,7 +776,7 @@
             [p1]
             p0 = call_malloc_nursery(%(tdescr.size)d)
             gc_store(p0, 0,  5678, %(tiddescr.field_size)s)
-            gc_store_indexed(p0, 0,  p1, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
+            gc_store(p0, %(tzdescr.offset)s, p1, %(tzdescr.field_size)s)
             jump()
         """)
 
@@ -781,7 +794,7 @@
             p1 = nursery_ptr_increment(p0, %(tdescr.size)d)
             gc_store(p1, 0,  1234, %(tiddescr.field_size)s)
             # <<<no cond_call_gc_wb here>>>
-            gc_store_indexed(p0, 0,  p1, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
+            gc_store(p0, %(tzdescr.offset)s, p1, %(tzdescr.field_size)s)
             jump()
         """)
 
@@ -798,7 +811,7 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 0, 5, descr=cdescr)
-            gc_store_indexed(p0, i2, p1, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 'i2', 'p1', cdescr))s
             jump()
         """)
 
@@ -816,8 +829,8 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 2, 3, descr=cdescr)
-            gc_store_indexed(p0, 1, p1, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 0, p2, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 1, 'p1', cdescr))s
+            %(setarrayitem('p0', 0, 'p2', cdescr))s
             jump()
         """)
 
@@ -835,8 +848,8 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 0, 3, descr=cdescr)
-            gc_store_indexed(p0, 3, p1, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 4, p2, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 3, 'p1', cdescr))s
+            %(setarrayitem('p0', 4, 'p2', cdescr))s
             jump()
         """)
 
@@ -855,9 +868,9 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 0, 5, descr=cdescr)
-            gc_store_indexed(p0, 3, p1, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 2, p2, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 1, p2, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 3, 'p1', cdescr))s
+            %(setarrayitem('p0', 2, 'p2', cdescr))s
+            %(setarrayitem('p0', 1, 'p2', cdescr))s
             jump()
         """)
 
@@ -878,11 +891,11 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 5, 0, descr=cdescr)
-            gc_store_indexed(p0, 3, p1, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 4, p2, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 0, p1, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 2, p2, %(trans_getarray_to_load(cdescr))s)
-            gc_store_indexed(p0, 1, p2, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 3, 'p1', cdescr))s
+            %(setarrayitem('p0', 4, 'p2', cdescr))s
+            %(setarrayitem('p0', 0, 'p1', cdescr))s
+            %(setarrayitem('p0', 2, 'p2', cdescr))s
+            %(setarrayitem('p0', 1, 'p2', cdescr))s
             jump()
         """)
 
@@ -901,10 +914,10 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 1, 4, descr=cdescr)
-            gc_store_indexed(p0, 0, p1, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 0, 'p1', cdescr))s
             call_n(321321)
             cond_call_gc_wb(p0, descr=wbdescr)
-            gc_store_indexed(p0, 1, p2, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 1, 'p2', cdescr))s
             jump()
         """)
 
@@ -923,10 +936,10 @@
             gc_store(p0, 0,  8111, %(tiddescr.field_size)s)
             gc_store(p0, 0,  5, %(clendescr.field_size)s)
             zero_array(p0, 1, 4, descr=cdescr)
-            gc_store_indexed(p0, 0, p1, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 0, 'p1', cdescr))s
             label(p0, p2)
             cond_call_gc_wb_array(p0, 1, descr=wbdescr)
-            gc_store_indexed(p0, 1, p2, %(trans_getarray_to_load(cdescr))s)
+            %(setarrayitem('p0', 1, 'p2', cdescr))s
             jump()
         """)
 
@@ -955,7 +968,7 @@
             gc_store(p0, 0,  i3, %(blendescr.field_size)s)
             zero_array(p0, 0, i3, descr=bdescr)
             cond_call_gc_wb_array(p0, 0, descr=wbdescr)
-            gc_store_indexed(p0, 0, p1, 1, %(bdescr.basesize)s, 1)
+            %(setarrayitem('p0', 0, 'p1', bdescr))s
             jump()
         """)
 
@@ -991,10 +1004,10 @@
             gc_store(p0, %(tdescr.gc_fielddescrs[0].offset)s, 0, %(tdescr.gc_fielddescrs[0].offset)s)
             p1 = call_malloc_nursery_varsize(1, 1, i0, \
                                 descr=strdescr)
-            gc_store_indexed(p1, 0,  i0, 1, %(strlendescr.offset)s, %(strlendescr.field_size)s)
+            gc_store(p1, %(strlendescr.offset)s, i0, %(strlendescr.field_size)s)
             gc_store(p1, 0,  0, %(strhashdescr.field_size)s)
             cond_call_gc_wb(p0, descr=wbdescr)
-            gc_store_indexed(p0, 0,  p1, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
+            gc_store(p0, %(tzdescr.offset)s, p1, %(tzdescr.field_size)s)
             jump()
         """)
 
@@ -1012,7 +1025,7 @@
             gc_store(p0, %(tdescr.gc_fielddescrs[0].offset)s, 0, %(tdescr.gc_fielddescrs[0].offset)s)
             label(p0, p1)
             cond_call_gc_wb(p0, descr=wbdescr)
-            gc_store_indexed(p0, 0,  p1, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
+            gc_store(p0, %(tzdescr.offset)s, p1, %(tzdescr.field_size)s)
             jump()
         """)
 
@@ -1025,8 +1038,8 @@
         """, """
             [p0, p1, p2]
             cond_call_gc_wb(p0, descr=wbdescr)
-            gc_store_indexed(p0, 0,  p1, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
-            gc_store_indexed(p0, 0,  p2, 1, %(tzdescr.offset)s, %(tzdescr.field_size)s)
+            gc_store(p0, %(tzdescr.offset)s, p1, %(tzdescr.field_size)s)
+            gc_store(p0, %(tzdescr.offset)s, p2, %(tzdescr.field_size)s)
             jump(p1, p2, p0)
         """)
 
@@ -1036,20 +1049,20 @@
         i2 = call_assembler_i(i0, f0, descr=casmdescr)
         """, """
         [i0, f0]
-        i1 = gc_load_indexed_i(ConstClass(frame_info), 0, 1, 1, %(jfi_frame_size.field_size)s)
+        i1 = gc_load_i(ConstClass(frame_info), %(jfi_frame_size.offset)s, %(jfi_frame_size.field_size)s)
         p1 = call_malloc_nursery_varsize_frame(i1)
         gc_store(p1, 0,  0, %(tiddescr.field_size)s)
-        i2 = gc_load_indexed_i(ConstClass(frame_info), 0, 1, 1, %(jfi_frame_depth.field_size)s)
-        gc_store_indexed(p1, 0, 0, 1, 1, %(jf_extra_stack_depth.field_size)s)
-        gc_store_indexed(p1, 0, NULL, 1, 1, %(jf_savedata.field_size)s)
-        gc_store_indexed(p1, 0, NULL, 1, 1, %(jf_force_descr.field_size)s)
-        gc_store_indexed(p1, 0, NULL, 1, 1, %(jf_descr.field_size)s)
-        gc_store_indexed(p1, 0, NULL, 1, 1, %(jf_guard_exc.field_size)s)
-        gc_store_indexed(p1, 0, NULL, 1, 1, %(jf_forward.field_size)s)
+        i2 = gc_load_i(ConstClass(frame_info), %(jfi_frame_depth.offset)s, %(jfi_frame_depth.field_size)s)
+        %(setfield('p1', 0, jf_extra_stack_depth))s
+        %(setfield('p1', 'NULL', jf_savedata))s
+        %(setfield('p1', 'NULL', jf_force_descr))s
+        %(setfield('p1', 'NULL', jf_descr))s
+        %(setfield('p1', 'NULL', jf_guard_exc))s
+        %(setfield('p1', 'NULL', jf_forward))s
         gc_store(p1, 0, i2, %(framelendescr.field_size)s)
-        gc_store_indexed(p1, 0, ConstClass(frame_info), 1, 1, %(jf_frame_info.field_size)s)
-        gc_store_indexed(p1, 0, i0, 8, 3, 8)
-        gc_store_indexed(p1, 1, f0, 8, 5, 8)
+        %(setfield('p1', 'ConstClass(frame_info)', jf_frame_info))s
+        gc_store(p1, 3, i0, 8)
+        gc_store(p1, 13, f0, 8)
         i3 = call_assembler_i(p1, descr=casmdescr)
         """)
 
@@ -1101,7 +1114,7 @@
             p0 = call_malloc_nursery(%(tdescr.size)d)
             gc_store(p0, 0,  5678, %(tiddescr.field_size)s)
             gc_store(p0, %(tdescr.gc_fielddescrs[0].offset)s, 0, %(tdescr.gc_fielddescrs[0].offset)s)
-            p1 = gc_load_indexed_r(p0, 0, 1, %(tzdescr.field_size)s, %(tzdescr.field_size)s)
+            p1 = gc_load_r(p0, %(tzdescr.offset)s, %(tzdescr.field_size)s)
             jump(p1)
         """)
 
@@ -1155,23 +1168,19 @@
         #    'i5 = int_add(i1,%(raw_sfdescr.basesize)s);'
         #    'gc_store(p0,i5,i2,%(raw_sfdescr.itemsize)s)'],
         [True, (1,2,4,8), 'i3 = getfield_gc_f(p0,descr=ydescr)' '->'
-           'i3 = gc_load_indexed_f(p0,0,1,%(ydescr.offset)s,%(ydescr.field_size)s)'],
-        [True, (1,2,4,8), 'i3 = getfield_gc_f(p0,descr=ydescr)' '->'
-           'i3 = gc_load_indexed_f(p0,0,1,%(ydescr.offset)s,%(ydescr.field_size)s)'],
-        [True, (1,2,4,8), 'i3 = setfield_raw(p0,i1,descr=ydescr)' '->'
-           'i3 = gc_store_indexed(p0,0,i1,1,'
-           '%(ydescr.offset)s,%(ydescr.field_size)s)'],
-        [True, (1,2,4,8), 'i3 = setfield_gc(p0,p0,descr=zdescr)' '->'
+           'i3 = gc_load_f(p0,%(ydescr.offset)s,%(ydescr.field_size)s)'],
+        [True, (1,2,4,8), 'setfield_raw(p0,i1,descr=ydescr)' '->'
+           'gc_store(p0,%(ydescr.offset)s,i1,%(ydescr.field_size)s)'],
+        [True, (1,2,4,8), 'setfield_gc(p0,p0,descr=zdescr)' '->'
            'cond_call_gc_wb(p0, descr=wbdescr);'
-           'i3 = gc_store_indexed(p0,0,p0,1,'
-           '%(zdescr.offset)s,%(zdescr.field_size)s)'],
+           'gc_store(p0,%(zdescr.offset)s,p0,%(zdescr.field_size)s)'],
         [False, (1,), 'i3 = arraylen_gc(p0, descr=adescr)' '->'
                       'i3 = gc_load_i(p0,0,%(adescr.itemsize)s)'],
         #[False, (1,),  'i3 = strlen(p0)' '->'
         #               'i3 = gc_load_i(p0,'
         #               '%(strlendescr.offset)s,%(strlendescr.field_size)s)'],
         [True,  (1,),  'i3 = strlen(p0)' '->'
-                       'i3 = gc_load_indexed_i(p0,0,1,'
+                       'i3 = gc_load_i(p0,'
                                  '%(strlendescr.offset)s,'
                                  '%(strlendescr.field_size)s)'],
         #[False, (1,),  'i3 = unicodelen(p0)' '->'
@@ -1179,7 +1188,7 @@
         #                       '%(unicodelendescr.offset)s,'
         #                       '%(unicodelendescr.field_size)s)'],
         [True,  (1,),  'i3 = unicodelen(p0)' '->'
-                       'i3 = gc_load_indexed_i(p0,0,1,'
+                       'i3 = gc_load_i(p0,'
                                '%(unicodelendescr.offset)s,'
                                '%(unicodelendescr.field_size)s)'],
 
diff --git a/rpython/jit/backend/ppc/opassembler.py b/rpython/jit/backend/ppc/opassembler.py
--- a/rpython/jit/backend/ppc/opassembler.py
+++ b/rpython/jit/backend/ppc/opassembler.py
@@ -20,7 +20,7 @@
                                                  PPCBuilder, PPCGuardToken)
 from rpython.jit.backend.ppc.regalloc import TempPtr, TempInt
 from rpython.jit.backend.llsupport import symbolic, jitframe
-from rpython.jit.backend.llsupport.descr import InteriorFieldDescr, CallDescr
+from rpython.jit.backend.llsupport.descr import CallDescr
 from rpython.jit.backend.llsupport.gcmap import allocate_gcmap
 from rpython.rtyper.lltypesystem import rstr, rffi, lltype
 from rpython.rtyper.annlowlevel import cast_instance_to_gcref
@@ -706,8 +706,10 @@
 
     _mixin_ = True
 
-    def _write_to_mem(self, value_loc, base_loc, ofs, size):
-        if size.value == 8:
+    def _write_to_mem(self, value_loc, base_loc, ofs, size_loc):
+        assert size_loc.is_imm()
+        size = size_loc.value
+        if size == 8:
             if value_loc.is_fp_reg():
                 if ofs.is_imm():
                     self.mc.stfd(value_loc.value, base_loc.value, ofs.value)
@@ -718,17 +720,17 @@
                     self.mc.std(value_loc.value, base_loc.value, ofs.value)
                 else:
                     self.mc.stdx(value_loc.value, base_loc.value, ofs.value)
-        elif size.value == 4:
+        elif size == 4:
             if ofs.is_imm():
                 self.mc.stw(value_loc.value, base_loc.value, ofs.value)
             else:
                 self.mc.stwx(value_loc.value, base_loc.value, ofs.value)
-        elif size.value == 2:
+        elif size == 2:
             if ofs.is_imm():
                 self.mc.sth(value_loc.value, base_loc.value, ofs.value)
             else:
                 self.mc.sthx(value_loc.value, base_loc.value, ofs.value)
-        elif size.value == 1:
+        elif size == 1:
             if ofs.is_imm():
                 self.mc.stb(value_loc.value, base_loc.value, ofs.value)
             else:
@@ -736,18 +738,35 @@
         else:
             assert 0, "size not supported"
 
-    def emit_setfield_gc(self, op, arglocs, regalloc):
-        value_loc, base_loc, ofs, size = arglocs
-        self._write_to_mem(value_loc, base_loc, ofs, size)
+    def emit_gc_store(self, op, arglocs, regalloc):
+        value_loc, base_loc, ofs_loc, size_loc = arglocs
+        self._write_to_mem(value_loc, base_loc, ofs_loc, size_loc)
 
-    emit_setfield_raw = emit_setfield_gc
-    emit_zero_ptr_field = emit_setfield_gc
+    def _apply_offset(self, index_loc, ofs_loc):
+        # If offset != 0 then we have to add it here.  Note that
+        # mc.addi() would not be valid with operand r0.
+        assert ofs_loc.is_imm()                # must be an immediate...
+        assert _check_imm_arg(ofs_loc.getint())   # ...that fits 16 bits
+        assert index_loc is not r.SCRATCH2
+        # (simplified version of _apply_scale())
+        if ofs_loc.value > 0:
+            self.mc.addi(r.SCRATCH2.value, index_loc.value, ofs_loc.value)
+            index_loc = r.SCRATCH2
+        return index_loc
 
-    def _load_from_mem(self, res, base_loc, ofs, size, signed):
+    def emit_gc_store_indexed(self, op, arglocs, regalloc):
+        base_loc, index_loc, value_loc, ofs_loc, size_loc = arglocs
+        index_loc = self._apply_offset(index_loc, ofs_loc)
+        self._write_to_mem(value_loc, base_loc, index_loc, size_loc)
+
+    def _load_from_mem(self, res, base_loc, ofs, size_loc, sign_loc):
         # res, base_loc, ofs, size and signed are all locations
         assert base_loc is not r.SCRATCH
-        sign = signed.value
-        if size.value == 8:
+        assert size_loc.is_imm()
+        size = size_loc.value
+        assert sign_loc.is_imm()
+        sign = sign_loc.value
+        if size == 8:
             if res.is_fp_reg():
                 if ofs.is_imm():
                     self.mc.lfd(res.value, base_loc.value, ofs.value)
@@ -758,7 +777,7 @@
                     self.mc.ld(res.value, base_loc.value, ofs.value)
                 else:
                     self.mc.ldx(res.value, base_loc.value, ofs.value)
-        elif size.value == 4:
+        elif size == 4:
             if IS_PPC_64 and sign:
                 if ofs.is_imm():
                     self.mc.lwa(res.value, base_loc.value, ofs.value)
@@ -769,7 +788,7 @@
                     self.mc.lwz(res.value, base_loc.value, ofs.value)
                 else:
                     self.mc.lwzx(res.value, base_loc.value, ofs.value)
-        elif size.value == 2:
+        elif size == 2:
             if sign:
                 if ofs.is_imm():
                     self.mc.lha(res.value, base_loc.value, ofs.value)
@@ -780,7 +799,7 @@
                     self.mc.lhz(res.value, base_loc.value, ofs.value)
                 else:
                     self.mc.lhzx(res.value, base_loc.value, ofs.value)
-        elif size.value == 1:
+        elif size == 1:
             if ofs.is_imm():
                 self.mc.lbz(res.value, base_loc.value, ofs.value)
             else:
@@ -790,22 +809,28 @@
         else:
             assert 0, "size not supported"
 
-    def _genop_getfield(self, op, arglocs, regalloc):
-        base_loc, ofs, res, size, sign = arglocs
-        self._load_from_mem(res, base_loc, ofs, size, sign)
+    def _genop_gc_load(self, op, arglocs, regalloc):
+        base_loc, ofs_loc, res_loc, size_loc, sign_loc = arglocs
+        self._load_from_mem(res_loc, base_loc, ofs_loc, size_loc, sign_loc)
 
-    emit_getfield_gc_i = _genop_getfield
-    emit_getfield_gc_r = _genop_getfield
-    emit_getfield_gc_f = _genop_getfield
-    emit_getfield_gc_pure_i = _genop_getfield
-    emit_getfield_gc_pure_r = _genop_getfield
-    emit_getfield_gc_pure_f = _genop_getfield
-    emit_getfield_raw_i = _genop_getfield
-    emit_getfield_raw_f = _genop_getfield
+    emit_gc_load_i = _genop_gc_load
+    emit_gc_load_r = _genop_gc_load
+    emit_gc_load_f = _genop_gc_load
+
+    def _genop_gc_load_indexed(self, op, arglocs, regalloc):
+        base_loc, index_loc, res_loc, ofs_loc, size_loc, sign_loc = arglocs
+        index_loc = self._apply_offset(index_loc, ofs_loc)
+        self._load_from_mem(res_loc, base_loc, index_loc, size_loc, sign_loc)
+
+    emit_gc_load_indexed_i = _genop_gc_load_indexed
+    emit_gc_load_indexed_r = _genop_gc_load_indexed
+    emit_gc_load_indexed_f = _genop_gc_load_indexed
 
     SIZE2SCALE = dict([(1<<_i, _i) for _i in range(32)])
 
     def _multiply_by_constant(self, loc, multiply_by, scratch_loc):
+        # XXX should die together with _apply_scale() but can't because
+        # of emit_zero_array() and malloc_cond_varsize() at the moment
         assert loc.is_reg()
         if multiply_by == 1:
             return loc
@@ -827,6 +852,9 @@
         return scratch_loc
 
     def _apply_scale(self, ofs, index_loc, itemsize):
+        # XXX should die now that getarrayitem and getinteriorfield are gone
+        # but can't because of emit_zero_array() at the moment
+
         # For arrayitem and interiorfield reads and writes: this returns an
         # offset suitable for use in ld/ldx or similar instructions.
         # The result will be either the register r2 or a 16-bit immediate.
@@ -857,44 +885,6 @@
                 index_loc = r.SCRATCH2
             return index_loc
 
-    def _genop_getarray_or_interiorfield(self, op, arglocs, regalloc):
-        (base_loc, index_loc, res_loc, ofs_loc,
-            itemsize, fieldsize, fieldsign) = arglocs
-        ofs_loc = self._apply_scale(ofs_loc, index_loc, itemsize)
-        self._load_from_mem(res_loc, base_loc, ofs_loc, fieldsize, fieldsign)
-
-    emit_getinteriorfield_gc_i = _genop_getarray_or_interiorfield
-    emit_getinteriorfield_gc_r = _genop_getarray_or_interiorfield
-    emit_getinteriorfield_gc_f = _genop_getarray_or_interiorfield
-
-    def emit_setinteriorfield_gc(self, op, arglocs, regalloc):
-        (base_loc, index_loc, value_loc, ofs_loc,
-            itemsize, fieldsize) = arglocs
-        ofs_loc = self._apply_scale(ofs_loc, index_loc, itemsize)
-        self._write_to_mem(value_loc, base_loc, ofs_loc, fieldsize)
-
-    emit_setinteriorfield_raw = emit_setinteriorfield_gc
-
-    def emit_arraylen_gc(self, op, arglocs, regalloc):
-        res, base_loc, ofs = arglocs
-        self.mc.load(res.value, base_loc.value, ofs.value)
-
-    emit_setarrayitem_gc = emit_setinteriorfield_gc
-    emit_setarrayitem_raw = emit_setarrayitem_gc
-
-    emit_getarrayitem_gc_i = _genop_getarray_or_interiorfield
-    emit_getarrayitem_gc_r = _genop_getarray_or_interiorfield
-    emit_getarrayitem_gc_f = _genop_getarray_or_interiorfield
-    emit_getarrayitem_gc_pure_i = _genop_getarray_or_interiorfield
-    emit_getarrayitem_gc_pure_r = _genop_getarray_or_interiorfield
-    emit_getarrayitem_gc_pure_f = _genop_getarray_or_interiorfield
-    emit_getarrayitem_raw_i = _genop_getarray_or_interiorfield
-    emit_getarrayitem_raw_f = _genop_getarray_or_interiorfield
-
-    emit_raw_store = emit_setarrayitem_gc
-    emit_raw_load_i = _genop_getarray_or_interiorfield
-    emit_raw_load_f = _genop_getarray_or_interiorfield
-
     def _copy_in_scratch2(self, loc):
         if loc.is_imm():
             self.mc.li(r.SCRATCH2.value, loc.value)
@@ -998,10 +988,6 @@
 
     _mixin_ = True
 
-    emit_strlen = FieldOpAssembler._genop_getfield
-    emit_strgetitem = FieldOpAssembler._genop_getarray_or_interiorfield
-    emit_strsetitem = FieldOpAssembler.emit_setarrayitem_gc
-
     def emit_copystrcontent(self, op, arglocs, regalloc):
         self._emit_copycontent(arglocs, is_unicode=False)
 
@@ -1059,12 +1045,8 @@
 
 
 class UnicodeOpAssembler(object):
-
     _mixin_ = True
-
-    emit_unicodelen = FieldOpAssembler._genop_getfield
-    emit_unicodegetitem = FieldOpAssembler._genop_getarray_or_interiorfield
-    emit_unicodesetitem = FieldOpAssembler.emit_setarrayitem_gc
+    # empty!
 
 
 class AllocOpAssembler(object):
diff --git a/rpython/jit/backend/ppc/regalloc.py b/rpython/jit/backend/ppc/regalloc.py
--- a/rpython/jit/backend/ppc/regalloc.py
+++ b/rpython/jit/backend/ppc/regalloc.py
@@ -17,12 +17,9 @@
 from rpython.rtyper.lltypesystem.lloperation import llop
 from rpython.rtyper.annlowlevel import cast_instance_to_gcref
 from rpython.jit.backend.llsupport import symbolic
-from rpython.jit.backend.llsupport.descr import ArrayDescr
+from rpython.jit.backend.llsupport.descr import unpack_arraydescr
 import rpython.jit.backend.ppc.register as r
 import rpython.jit.backend.ppc.condition as c
-from rpython.jit.backend.llsupport.descr import unpack_arraydescr
-from rpython.jit.backend.llsupport.descr import unpack_fielddescr
-from rpython.jit.backend.llsupport.descr import unpack_interiorfielddescr
 from rpython.jit.backend.llsupport.gcmap import allocate_gcmap
 from rpython.rlib.objectmodel import we_are_translated
 from rpython.rlib.debug import debug_print
@@ -691,159 +688,69 @@
                                  src_locations2, dst_locations2, fptmploc)
         return []
 
-    def prepare_setfield_gc(self, op):
-        ofs, size, _ = unpack_fielddescr(op.getdescr())
+    def prepare_gc_store(self, op):
         base_loc = self.ensure_reg(op.getarg(0))
-        value_loc = self.ensure_reg(op.getarg(1))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        return [value_loc, base_loc, ofs_loc, imm(size)]
+        ofs_loc = self.ensure_reg_or_16bit_imm(op.getarg(1))
+        value_loc = self.ensure_reg(op.getarg(2))
+        size_loc = self.ensure_reg_or_any_imm(op.getarg(3))
+        return [value_loc, base_loc, ofs_loc, size_loc]
 
-    prepare_setfield_raw = prepare_setfield_gc
+    def _prepare_gc_load(self, op):
+        base_loc = self.ensure_reg(op.getarg(0))
+        ofs_loc = self.ensure_reg_or_16bit_imm(op.getarg(1))
+        self.free_op_vars()
+        res_loc = self.force_allocate_reg(op)
+        size_box = op.getarg(2)
+        assert isinstance(size_box, ConstInt)
+        nsize = size_box.value      # negative for "signed"
+        size_loc = imm(abs(nsize))
+        if nsize < 0:
+            sign = 1
+        else:
+            sign = 0
+        return [base_loc, ofs_loc, res_loc, size_loc, imm(sign)]
 
-    def _prepare_getfield(self, op):
-        ofs, size, sign = unpack_fielddescr(op.getdescr())
+    prepare_gc_load_i = _prepare_gc_load
+    prepare_gc_load_r = _prepare_gc_load
+    prepare_gc_load_f = _prepare_gc_load
+
+    def prepare_gc_store_indexed(self, op):
         base_loc = self.ensure_reg(op.getarg(0))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
+        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
+        value_loc = self.ensure_reg(op.getarg(2))
+        assert op.getarg(3).getint() == 1    # scale
+        ofs_loc = self.ensure_reg_or_16bit_imm(op.getarg(4))
+        assert ofs_loc.is_imm()  # the arg(4) should always be a small constant
+        size_loc = self.ensure_reg_or_any_imm(op.getarg(5))
+        return [base_loc, index_loc, value_loc, ofs_loc, size_loc]
+
+    def _prepare_gc_load_indexed(self, op):
+        base_loc = self.ensure_reg(op.getarg(0))
+        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
+        assert op.getarg(2).getint() == 1    # scale
+        ofs_loc = self.ensure_reg_or_16bit_imm(op.getarg(3))
+        assert ofs_loc.is_imm()  # the arg(3) should always be a small constant
         self.free_op_vars()
-        res = self.force_allocate_reg(op)
-        return [base_loc, ofs_loc, res, imm(size), imm(sign)]
+        res_loc = self.force_allocate_reg(op)
+        size_box = op.getarg(4)
+        assert isinstance(size_box, ConstInt)
+        nsize = size_box.value      # negative for "signed"
+        size_loc = imm(abs(nsize))
+        if nsize < 0:
+            sign = 1
+        else:
+            sign = 0
+        return [base_loc, index_loc, res_loc, ofs_loc, size_loc, imm(sign)]
 
-    prepare_getfield_gc_i = _prepare_getfield
-    prepare_getfield_gc_r = _prepare_getfield
-    prepare_getfield_gc_f = _prepare_getfield
-    prepare_getfield_raw_i = _prepare_getfield
-    prepare_getfield_raw_f = _prepare_getfield
-    prepare_getfield_gc_pure_i = _prepare_getfield
-    prepare_getfield_gc_pure_r = _prepare_getfield
-    prepare_getfield_gc_pure_f = _prepare_getfield
+    prepare_gc_load_indexed_i = _prepare_gc_load_indexed
+    prepare_gc_load_indexed_r = _prepare_gc_load_indexed
+    prepare_gc_load_indexed_f = _prepare_gc_load_indexed
 
     def prepare_increment_debug_counter(self, op):
         base_loc = self.ensure_reg(op.getarg(0))
         temp_loc = r.SCRATCH2
         return [base_loc, temp_loc]
 
-    def _prepare_getinteriorfield(self, op):
-        t = unpack_interiorfielddescr(op.getdescr())
-        ofs, itemsize, fieldsize, sign = t
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        return [base_loc, index_loc, result_loc, ofs_loc,
-                imm(itemsize), imm(fieldsize), imm(sign)]
-
-    prepare_getinteriorfield_gc_i = _prepare_getinteriorfield
-    prepare_getinteriorfield_gc_r = _prepare_getinteriorfield
-    prepare_getinteriorfield_gc_f = _prepare_getinteriorfield
-
-    def prepare_setinteriorfield_gc(self, op):
-        t = unpack_interiorfielddescr(op.getdescr())
-        ofs, itemsize, fieldsize, _ = t
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        value_loc = self.ensure_reg(op.getarg(2))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        return [base_loc, index_loc, value_loc, ofs_loc,
-                imm(itemsize), imm(fieldsize)]
-
-    prepare_setinteriorfield_raw = prepare_setinteriorfield_gc
-
-    def prepare_arraylen_gc(self, op):
-        arraydescr = op.getdescr()
-        assert isinstance(arraydescr, ArrayDescr)
-        ofs = arraydescr.lendescr.offset
-        assert _check_imm_arg(ofs)
-        base_loc = self.ensure_reg(op.getarg(0))
-        self.free_op_vars()
-        res = self.force_allocate_reg(op)
-        return [res, base_loc, imm(ofs)]
-
-    def prepare_setarrayitem_gc(self, op):
-        size, ofs, _ = unpack_arraydescr(op.getdescr())
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        value_loc = self.ensure_reg(op.getarg(2))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        imm_size = imm(size)
-        return [base_loc, index_loc, value_loc, ofs_loc,
-                imm_size, imm_size]
-
-    prepare_setarrayitem_raw = prepare_setarrayitem_gc
-
-    def prepare_raw_store(self, op):
-        size, ofs, _ = unpack_arraydescr(op.getdescr())
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        value_loc = self.ensure_reg(op.getarg(2))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        return [base_loc, index_loc, value_loc, ofs_loc,
-                imm(1), imm(size)]
-
-    def _prepare_getarrayitem(self, op):
-        size, ofs, sign = unpack_arraydescr(op.getdescr())
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        imm_size = imm(size)
-        return [base_loc, index_loc, result_loc, ofs_loc,
-                imm_size, imm_size, imm(sign)]
-
-    prepare_getarrayitem_gc_i = _prepare_getarrayitem
-    prepare_getarrayitem_gc_r = _prepare_getarrayitem
-    prepare_getarrayitem_gc_f = _prepare_getarrayitem
-    prepare_getarrayitem_raw_i = _prepare_getarrayitem
-    prepare_getarrayitem_raw_f = _prepare_getarrayitem
-    prepare_getarrayitem_gc_pure_i = _prepare_getarrayitem
-    prepare_getarrayitem_gc_pure_r = _prepare_getarrayitem
-    prepare_getarrayitem_gc_pure_f = _prepare_getarrayitem
-
-    def _prepare_raw_load(self, op):
-        size, ofs, sign = unpack_arraydescr(op.getdescr())
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(ofs))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        return [base_loc, index_loc, result_loc, ofs_loc,
-                imm(1), imm(size), imm(sign)]
-
-    prepare_raw_load_i = _prepare_raw_load
-    prepare_raw_load_f = _prepare_raw_load
-
-    def prepare_strlen(self, op):
-        basesize, itemsize, ofs_length = symbolic.get_array_token(rstr.STR,
-                                             self.cpu.translate_support_code)
-        base_loc = self.ensure_reg(op.getarg(0))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        return [base_loc, imm(ofs_length), result_loc, imm(WORD), imm(0)]
-
-    def prepare_strgetitem(self, op):
-        basesize, itemsize, _ = symbolic.get_array_token(rstr.STR,
-                                    self.cpu.translate_support_code)
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(basesize))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        imm_size = imm(itemsize)
-        return [base_loc, index_loc, result_loc, ofs_loc,
-                imm_size, imm_size, imm(0)]
-
-    def prepare_strsetitem(self, op):
-        basesize, itemsize, _ = symbolic.get_array_token(rstr.STR,
-                                    self.cpu.translate_support_code)
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        value_loc = self.ensure_reg(op.getarg(2))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(basesize))
-        imm_size = imm(itemsize)
-        return [base_loc, index_loc, value_loc, ofs_loc,
-                imm_size, imm_size]
-
     def prepare_copystrcontent(self, op):
         src_ptr_loc = self.ensure_reg(op.getarg(0))
         dst_ptr_loc = self.ensure_reg(op.getarg(1))
@@ -856,37 +763,6 @@
 
     prepare_copyunicodecontent = prepare_copystrcontent
 
-    def prepare_unicodelen(self, op):
-        basesize, itemsize, ofs_length = symbolic.get_array_token(rstr.UNICODE,
-                                             self.cpu.translate_support_code)
-        base_loc = self.ensure_reg(op.getarg(0))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        return [base_loc, imm(ofs_length), result_loc, imm(WORD), imm(0)]
-
-    def prepare_unicodegetitem(self, op):
-        basesize, itemsize, _ = symbolic.get_array_token(rstr.UNICODE,
-                                    self.cpu.translate_support_code)
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(basesize))
-        self.free_op_vars()
-        result_loc = self.force_allocate_reg(op)
-        imm_size = imm(itemsize)
-        return [base_loc, index_loc, result_loc, ofs_loc,
-                imm_size, imm_size, imm(0)]
-
-    def prepare_unicodesetitem(self, op):
-        basesize, itemsize, _ = symbolic.get_array_token(rstr.UNICODE,
-                                    self.cpu.translate_support_code)
-        base_loc = self.ensure_reg(op.getarg(0))
-        index_loc = self.ensure_reg_or_any_imm(op.getarg(1))
-        value_loc = self.ensure_reg(op.getarg(2))
-        ofs_loc = self.ensure_reg_or_16bit_imm(ConstInt(basesize))
-        imm_size = imm(itemsize)
-        return [base_loc, index_loc, value_loc, ofs_loc,
-                imm_size, imm_size]
-
     prepare_same_as_i = helper.prepare_unary_op
     prepare_same_as_r = helper.prepare_unary_op
     prepare_same_as_f = helper.prepare_unary_op
@@ -1078,12 +954,6 @@
         arglocs = self._prepare_guard(op)
         return arglocs
 
-    def prepare_zero_ptr_field(self, op):
-        base_loc = self.ensure_reg(op.getarg(0))
-        ofs_loc = self.ensure_reg_or_16bit_imm(op.getarg(1))
-        value_loc = self.ensure_reg(ConstInt(0))
-        return [value_loc, base_loc, ofs_loc, imm(WORD)]
-
     def prepare_zero_array(self, op):
         itemsize, ofs, _ = unpack_arraydescr(op.getdescr())
         base_loc = self.ensure_reg(op.getarg(0))
diff --git a/rpython/jit/backend/ppc/runner.py b/rpython/jit/backend/ppc/runner.py
--- a/rpython/jit/backend/ppc/runner.py
+++ b/rpython/jit/backend/ppc/runner.py
@@ -21,6 +21,9 @@
     IS_64_BIT = True
     backend_name = 'ppc64'
 
+    # can an ISA instruction handle a factor to the offset?
+    load_supported_factors = (1,)
+
     from rpython.jit.backend.ppc.register import JITFRAME_FIXED_SIZE
     frame_reg = r.SP
     all_reg_indexes = [-1] * 32
diff --git a/rpython/jit/backend/x86/regalloc.py b/rpython/jit/backend/x86/regalloc.py
--- a/rpython/jit/backend/x86/regalloc.py
+++ b/rpython/jit/backend/x86/regalloc.py
@@ -4,8 +4,7 @@
 
 import os, sys
 from rpython.jit.backend.llsupport import symbolic
-from rpython.jit.backend.llsupport.descr import (ArrayDescr, CallDescr,
-    unpack_arraydescr, unpack_fielddescr, unpack_interiorfielddescr)
+from rpython.jit.backend.llsupport.descr import CallDescr, unpack_arraydescr
 from rpython.jit.backend.llsupport.gcmap import allocate_gcmap
 from rpython.jit.backend.llsupport.regalloc import (FrameManager, BaseRegalloc,
      RegisterManager, TempVar, compute_vars_longevity, is_comparison_or_ovf_op,
@@ -1039,7 +1038,8 @@
         base_loc = self.rm.make_sure_var_in_reg(op.getarg(0), args)
         size_box = op.getarg(3)
         assert isinstance(size_box, ConstInt)
-        size = abs(size_box.value)
+        size = size_box.value
+        assert size >= 1
         if size == 1:
             need_lower_byte = True
         else:
@@ -1061,7 +1061,8 @@
         assert isinstance(size_box, ConstInt)
         factor = scale_box.value
         offset = offset_box.value
-        size = abs(size_box.value)
+        size = size_box.value
+        assert size >= 1
         if size == 1:
             need_lower_byte = True
         else:
@@ -1083,9 +1084,9 @@
         result_loc = self.force_allocate_reg(op)
         size_box = op.getarg(2)
         assert isinstance(size_box, ConstInt)
-        size = size_box.value
-        size_loc = imm(abs(size))
-        if size < 0:
+        nsize = size_box.value      # negative for "signed"
+        size_loc = imm(abs(nsize))
+        if nsize < 0:
             sign_loc = imm1
         else:
             sign_loc = imm0
@@ -1108,9 +1109,9 @@
         assert isinstance(size_box, ConstInt)
         scale = scale_box.value
         offset = offset_box.value
-        size = size_box.value
-        size_loc = imm(abs(size))
-        if size < 0:
+        nsize = size_box.value      # negative for "signed"
+        size_loc = imm(abs(nsize))
+        if nsize < 0:
             sign_loc = imm1
         else:
             sign_loc = imm0
diff --git a/rpython/jit/metainterp/history.py b/rpython/jit/metainterp/history.py
--- a/rpython/jit/metainterp/history.py
+++ b/rpython/jit/metainterp/history.py
@@ -68,8 +68,8 @@
         return box.value
 
 def repr_rpython(box, typechars):
-    return '%s/%s%d' % (box._get_hash_(), typechars,
-                        compute_unique_id(box))
+    return '%s/%s' % (box._get_hash_(), typechars,
+                        ) #compute_unique_id(box))
 
 
 class XxxAbstractValue(object):
diff --git a/rpython/jit/metainterp/resoperation.py b/rpython/jit/metainterp/resoperation.py
--- a/rpython/jit/metainterp/resoperation.py
+++ b/rpython/jit/metainterp/resoperation.py
@@ -1204,8 +1204,12 @@
     '_NOSIDEEFFECT_LAST', # ----- end of no_side_effect operations -----
 
     # same paramters as GC_LOAD, but one additional for the value to store
-    # note that the itemsize is not signed!
+    # note that the itemsize is not signed (always > 0)
     # (gcptr, index, value, [scale, base_offset,] itemsize)
+    # invariants for GC_STORE: index is constant, but can be large
+    # invariants for GC_STORE_INDEXED: index is a non-constant box;
+    #                                  scale is a constant;
+    #                                  base_offset is a small constant
     'GC_STORE/4d/n',
     'GC_STORE_INDEXED/6d/n',
 
diff --git a/rpython/rlib/objectmodel.py b/rpython/rlib/objectmodel.py
--- a/rpython/rlib/objectmodel.py
+++ b/rpython/rlib/objectmodel.py
@@ -114,6 +114,8 @@
 
 specialize = _Specialize()
 
+NOT_CONSTANT = object()      # to use in enforceargs()
+
 def enforceargs(*types_, **kwds):
     """ Decorate a function with forcing of RPython-level types on arguments.
     None means no enforcing.
diff --git a/rpython/rlib/rposix.py b/rpython/rlib/rposix.py
--- a/rpython/rlib/rposix.py
+++ b/rpython/rlib/rposix.py
@@ -9,7 +9,7 @@
 from rpython.translator.tool.cbuild import ExternalCompilationInfo
 from rpython.rlib.rarithmetic import intmask, widen
 from rpython.rlib.objectmodel import (
-    specialize, enforceargs, register_replacement_for)
+    specialize, enforceargs, register_replacement_for, NOT_CONSTANT)
 from rpython.rlib.signature import signature
 from rpython.rlib import types
 from rpython.annotator.model import s_Str0
@@ -415,7 +415,7 @@
 
 @replace_os_function('open')
 @specialize.argtype(0)
- at enforceargs(None, int, int, typecheck=False)
+ at enforceargs(NOT_CONSTANT, int, int, typecheck=False)
 def open(path, flags, mode):
     if _prefer_unicode(path):
         fd = c_wopen(_as_unicode0(path), flags, mode)
diff --git a/rpython/rlib/test/test_objectmodel.py b/rpython/rlib/test/test_objectmodel.py
--- a/rpython/rlib/test/test_objectmodel.py
+++ b/rpython/rlib/test/test_objectmodel.py
@@ -4,7 +4,7 @@
     r_dict, UnboxedValue, Symbolic, compute_hash, compute_identity_hash,
     compute_unique_id, current_object_addr_as_int, we_are_translated,
     prepare_dict_update, reversed_dict, specialize, enforceargs, newlist_hint,
-    resizelist_hint, is_annotation_constant, always_inline,
+    resizelist_hint, is_annotation_constant, always_inline, NOT_CONSTANT,
     iterkeys_with_hash, iteritems_with_hash, contains_with_hash,
     setitem_with_hash, getitem_with_hash, delitem_with_hash, import_from_mixin)
 from rpython.translator.translator import TranslationContext, graphof
@@ -529,6 +529,18 @@
     TYPES = [v.concretetype for v in graph.getargs()]
     assert TYPES == [lltype.Signed, lltype.Float]
 
+def test_enforceargs_not_constant():
+    from rpython.translator.translator import TranslationContext, graphof
+    @enforceargs(NOT_CONSTANT)
+    def f(a):
+        return a
+    def f42():
+        return f(42)
+    t = TranslationContext()
+    a = t.buildannotator()
+    s = a.build_types(f42, [])
+    assert not hasattr(s, 'const')
+
 
 def getgraph(f, argtypes):
     from rpython.translator.translator import TranslationContext, graphof
diff --git a/rpython/tool/runsubprocess.py b/rpython/tool/runsubprocess.py
--- a/rpython/tool/runsubprocess.py
+++ b/rpython/tool/runsubprocess.py
@@ -9,6 +9,8 @@
 from subprocess import PIPE, Popen
 
 def run_subprocess(executable, args, env=None, cwd=None):
+    if isinstance(args, list):
+        args = [a.encode('latin1') for a in args]
     return _run(executable, args, env, cwd)
 
 shell_default = False


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