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From 55ec7e3af4823fc378f78e35b795af1bafcd3542 Mon Sep 17 00:00:00 2001
From: ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 3 May 2011 07:20:30 +0000
Subject: [PATCH] PR target/48723
* config/i386/i386.c (ix86_expand_prologue): Do not probe the stack
for -fstack-check if the size to allocate is negative.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@173289 138bc75d-0d04-0410-961f-82ee72b054a4
index 6e4bb3b..f3a8a0c 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -10566,8 +10566,8 @@ ix86_expand_prologue (void)
}
/* The stack has already been decremented by the instruction calling us
- so we need to probe unconditionally to preserve the protection area. */
- if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
+ so probe if the size is non-negative to preserve the protection area. */
+ if (allocate >= 0 && flag_stack_check == STATIC_BUILTIN_STACK_CHECK)
{
/* We expect the registers to be saved when probes are used. */
gcc_assert (int_registers_saved);
--
1.7.0.4
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