[pypy-issue] [issue851] PyPy does not optimize division into shifts
Amaury Forgeot d Arc
tracker at bugs.pypy.org
Mon Aug 29 15:04:58 CEST 2011
Amaury Forgeot d Arc <amauryfa at gmail.com> added the comment:
What makes you think so? It seems on the contrary that it does.
In pypy/jit/metainterp/optimizeopt/pypy/jit/metainterp/optimizeopt/rewrite.py, in optimize_INT_FLOORDIV():
if v1.intbound.known_ge(IntBound(0, 0)) and v2.is_constant():
val = v2.box.getint()
if val & (val - 1) == 0 and val > 0: # val == 2**shift
op = op.copy_and_change(rop.INT_RSHIFT,
args = [op.getarg(0), ConstInt(highest_bit(val))])
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nosy: +afa
status: unread -> chatting
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