Author: Armin Rigo <[email protected]>
Branch:
Changeset: r51565:c5d041657831
Date: 2012-01-21 11:37 +0100
http://bitbucket.org/pypy/pypy/changeset/c5d041657831/
Log: Special-case in RPython the case of "x ** 2.0".
diff --git a/pypy/rpython/lltypesystem/module/ll_math.py
b/pypy/rpython/lltypesystem/module/ll_math.py
--- a/pypy/rpython/lltypesystem/module/ll_math.py
+++ b/pypy/rpython/lltypesystem/module/ll_math.py
@@ -292,6 +292,10 @@
# deal directly with IEEE specials, to cope with problems on various
# platforms whose semantics don't exactly match C99
+ if y == 2.0:
+ return x * x # this is always a correct answer, and is relatively
+ # common in user programs.
+
if isnan(y):
if x == 1.0:
return 1.0 # 1**Nan = 1
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