Author: Carl Friedrich Bolz <cfb...@gmx.de>
Branch:
Changeset: r48196:ba7afb49a544
Date: 2011-10-18 10:48 +0200
http://bitbucket.org/pypy/pypy/changeset/ba7afb49a544/
Log: slightly pointless micro-optimization, but I found the adjective
"quick" in this comment too ironic
diff --git a/pypy/jit/metainterp/optimizeopt/rewrite.py
b/pypy/jit/metainterp/optimizeopt/rewrite.py
--- a/pypy/jit/metainterp/optimizeopt/rewrite.py
+++ b/pypy/jit/metainterp/optimizeopt/rewrite.py
@@ -139,13 +139,13 @@
self.make_constant_int(op.result, 0)
else:
for lhs, rhs in [(v1, v2), (v2, v1)]:
- # x & (x -1) == 0 is a quick test for power of 2
- if (lhs.is_constant() and
- (lhs.box.getint() & (lhs.box.getint() - 1)) == 0):
- new_rhs = ConstInt(highest_bit(lhs.box.getint()))
- op = op.copy_and_change(rop.INT_LSHIFT, args=[rhs.box,
new_rhs])
- break
-
+ if lhs.is_constant():
+ x = lhs.box.getint()
+ # x & (x - 1) == 0 is a quick test for power of 2
+ if x & (x - 1) == 0:
+ new_rhs = ConstInt(highest_bit(lhs.box.getint()))
+ op = op.copy_and_change(rop.INT_LSHIFT, args=[rhs.box,
new_rhs])
+ break
self.emit_operation(op)
def optimize_UINT_FLOORDIV(self, op):
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