From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 28 Mar 2012 14:49:26 +0000 (+0000)
Subject: 	PR middle-end/52691
X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=commitdiff_plain;h=a6534db004d277ab2f3765b688a07a0f78901d07

	PR middle-end/52691
	* tree-ssa-ccp.c (optimize_stdarg_builtin): Optimize
	__builtin_va_start to __builtin_next_arg if the latter is
	builtin_decl_explicit_p rather than when it is not.

	* gcc.dg/pr52691.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_7-branch@185918 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4df376f72c6..ae914dab471 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2012-03-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/52691
+	* tree-ssa-ccp.c (optimize_stdarg_builtin): Optimize
+	__builtin_va_start to __builtin_next_arg if the latter is
+	builtin_decl_explicit_p rather than when it is not.
+
 	PR middle-end/52750
 	* tree-vect-generic.c (vector_element): Perform multiplication
 	for pos in bitsizetype type instead of idx type.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index fecd7827dac..065abbb088f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2012-03-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/52691
+	* gcc.dg/pr52691.c: New test.
+
 	PR middle-end/52750
 	* gcc.c-torture/compile/pr52750.c: New test.
 
diff --git a/gcc/testsuite/gcc.dg/pr52691.c b/gcc/testsuite/gcc.dg/pr52691.c
new file mode 100644
index 00000000000..7a2d7d8ebb1
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr52691.c
@@ -0,0 +1,24 @@
+/* PR middle-end/52691 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+#include <stdarg.h>
+
+int
+foo (int a, ...)
+{
+  int b = 0, c = 0;
+  va_list ap;
+  va_start (ap, a);
+  if (a > 1)
+    b = va_arg (ap, double);
+  if (a > 2)
+    c = va_arg (ap, long long);
+  va_end (ap);
+  return a + b + c;
+}
+
+/* { dg-final { scan-tree-dump "__builtin_next_arg" "optimized" { target { { i?86-*-* x86_64-*-* } && ia32 } } } } */
+/* { dg-final { scan-tree-dump "__builtin_next_arg" "optimized" { target { powerpc*-*-darwin* powerpc*-*-aix* } } } } */
+/* { dg-final { scan-tree-dump "__builtin_next_arg" "optimized" { target { powerpc*-*-linux* && lp64 } } } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c
index 2080c06cce6..c28006a9132 100644
--- a/gcc/tree-ssa-ccp.c
+++ b/gcc/tree-ssa-ccp.c
@@ -2288,7 +2288,7 @@ optimize_stdarg_builtin (gimple call)
     case BUILT_IN_VA_START:
       if (!va_list_simple_ptr
 	  || targetm.expand_builtin_va_start != NULL
-          || builtin_decl_explicit_p (BUILT_IN_NEXT_ARG))
+	  || !builtin_decl_explicit_p (BUILT_IN_NEXT_ARG))
 	return NULL_TREE;
 
       if (gimple_call_num_args (call) != 2)