From: Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Date: Tue, 9 Dec 2014 23:02:06 +0000 (+0000)
Subject: re PR middle-end/64225 (-funsafe-math-optimizations generates call to pow where multi... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c293be1a19d6213249aa9707f75003d83a03962d;p=gcc.git

re PR middle-end/64225 (-funsafe-math-optimizations generates call to pow where multiply instruction would do)

2014-12-09  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR middle-end/64225
	* tree-ssa-reassoc.c (acceptable_pow_call): Disable transformation
	for BUILT_IN_POW when flag_errno_math is present.

From-SVN: r218546
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cbef2f2693a..ce5183523cb 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2014-12-09  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	PR middle-end/64225
+	* tree-ssa-reassoc.c (acceptable_pow_call): Disable transformation
+	for BUILT_IN_POW when flag_errno_math is present.
+
 2014-12-09  Ilya Verbin  <ilya.verbin@intel.com>
 
 	* lto-wrapper.c (compile_offload_image): Start processing in_argv
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c
index 68a67b65f53..4fae8fcad70 100644
--- a/gcc/tree-ssa-reassoc.c
+++ b/gcc/tree-ssa-reassoc.c
@@ -3988,6 +3988,9 @@ acceptable_pow_call (gimple stmt, tree *base, HOST_WIDE_INT *exponent)
   switch (DECL_FUNCTION_CODE (fndecl))
     {
     CASE_FLT_FN (BUILT_IN_POW):
+      if (flag_errno_math)
+	return false;
+
       *base = gimple_call_arg (stmt, 0);
       arg1 = gimple_call_arg (stmt, 1);