[pypy-svn] r34576 - pypy/dist/pypy/jit/codegen/ppc

[mwh at codespeak.net]

Author: mwh
Date: Mon Nov 13 17:21:22 2006
New Revision: 34576

Modified:
   pypy/dist/pypy/jit/codegen/ppc/rgenop.py
Log:
waste a little bit less stack, and expand a docstring.


Modified: pypy/dist/pypy/jit/codegen/ppc/rgenop.py
==============================================================================
--- pypy/dist/pypy/jit/codegen/ppc/rgenop.py	(original)
+++ pypy/dist/pypy/jit/codegen/ppc/rgenop.py	Mon Nov 13 17:21:22 2006
@@ -361,8 +361,9 @@
         """ Returns the required stack size to store all data, assuming
         that there are 'param' bytes of parameters for callee functions and
         'lv' is the largest (wrt to abs() :) rFP-relative byte offset of
-        any variable on the stack."""
-        return ((24 + param - lv + 15) & ~15)
+        any variable on the stack.  Plus 4 because the rFP actually points
+        into our caller's linkage area."""
+        return ((4 + param - lv + 15) & ~15)
 
     def _close(self):
         self.rgenop.close_mc(self.asm.mc)