From: Jan Hubicka <jh@suse.cz>
Date: Fri, 16 Jan 2004 19:01:06 +0000 (+0100)
Subject: re PR target/13608 (Incorrect code with -O3 -ffast-math)
X-Git-Tag: releases/gcc-3.3.3~85
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8088c8254318ef408b865bd9a64e39f9620c51b9;p=thirdparty%2Fgcc.git

re PR target/13608 (Incorrect code with -O3 -ffast-math)


	PR opt/13608
	* i386.c (ix86_compute_frame_layout): Fix for alloca on leaf function.

From-SVN: r75990
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2ae63a75de50..0e6aee8c5ca0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2004-01-16  Jan Hubicka  <jh@suse.cz>
+
+	PR opt/13608
+	* i386.c (ix86_compute_frame_layout): Fix for alloca on leaf function.
+
 2004-01-16  Segher Boessenkool  <boessen@de.ibm.com>
 
         PR target/11793
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 0661d0a59a30..a3e00e58f9b1 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -4567,8 +4567,12 @@ ix86_compute_frame_layout (frame)
   offset += size;
 
   /* Add outgoing arguments area.  Can be skipped if we eliminated
-     all the function calls as dead code.  */
-  if (ACCUMULATE_OUTGOING_ARGS && !current_function_is_leaf)
+     all the function calls as dead code.
+     Skipping is however impossible when function calls alloca.  Alloca
+     expander assumes that last current_function_outgoing_args_size
+     of stack frame are unused.  */
+  if (ACCUMULATE_OUTGOING_ARGS
+      && (!current_function_is_leaf || current_function_calls_alloca))
     {
       offset += current_function_outgoing_args_size;
       frame->outgoing_arguments_size = current_function_outgoing_args_size;