Author: Alex Gaynor <[email protected]>
Branch:
Changeset: r48350:13caa6fd920e
Date: 2011-10-22 17:01 -0700
http://bitbucket.org/pypy/pypy/changeset/13caa6fd920e/
Log: optimize int_floordiv(0, i) to always return 0.
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
@@ -448,6 +448,9 @@
if v2.is_constant() and v2.box.getint() == 1:
self.make_equal_to(op.result, v1)
return
+ elif v1.is_constant() and v1.box.getint() == 0:
+ self.make_constant_int(op.result, 0)
+ return
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
diff --git a/pypy/jit/metainterp/optimizeopt/test/test_optimizebasic.py
b/pypy/jit/metainterp/optimizeopt/test/test_optimizebasic.py
--- a/pypy/jit/metainterp/optimizeopt/test/test_optimizebasic.py
+++ b/pypy/jit/metainterp/optimizeopt/test/test_optimizebasic.py
@@ -2181,6 +2181,17 @@
"""
self.optimize_loop(ops, expected)
+ ops = """
+ [i0]
+ i1 = int_floordiv(0, i0)
+ jump(i1)
+ """
+ expected = """
+ [i0]
+ jump(0)
+ """
+ self.optimize_loop(ops, expected)
+
def test_fold_partially_constant_ops_ovf(self):
ops = """
[i0]
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