PR 42694: Optimize pow (x, 0.25), pow (x, 0.75), pow (x, 1./6.)

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@158346 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 63827c2..ab72289 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2010-04-14  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+       PR middle-end/42694
+       * builtins.c (expand_builtin_pow_root): New function to expand pow
+       calls with exponents 0.25, 0.50, 0.75, 1./3., and 1./6. into a
+       series of sqrt and cbrt calls under -ffast-math.
+       (expand_builtin_pow): Call it.
+
 2010-04-14  Michael Matz  <matz@suse.de>
 
        PR tree-optimization/42963