[PATCH, i386]: Fix PR target/48723

[Uros Bizjak]

Hello!

Attached one-liner fixes PR target/48723, ICE in
ix86_expand_prologue() with -fstack-check + function returning struct,
on corei7-avx. The problem was, that we forgot to update accounting
info when ix86_adjust_stack_and_probe adjusted stack pointer (in this
particular case, m->fs.sp_offset was set by stack realignment code for
AVX 32byte stack alignment.

2011-04-22  Uros Bizjak  <ubiz...@gmail.com>

        PR target/48723
        * config/i386/i386.c (ix86_expand_prologue): Update m->fs.sp_offset
        after the call to ix86_adjust_stack_and_probe.

testsuite/ChangeLog:

2011-04-22  Uros Bizjak  <ubiz...@gmail.com>

        PR target/48723
        * gcc.target/i386/pr48723.c: New test.

Tested on x86_64-pc-linux-gnu {,-m32} AVX target.

Patch was committed to mainline and 4.6 branch.

Uros.

Index: config/i386/i386.c
===================================================================
--- config/i386/i386.c  (revision 172860)
+++ config/i386/i386.c  (working copy)
@@ -10628,6 +10628,7 @@ ix86_expand_prologue (void)
       if (STACK_CHECK_MOVING_SP)
        {
          ix86_adjust_stack_and_probe (allocate);
+         m->fs.sp_offset += allocate;
          allocate = 0;
        }
       else
Index: testsuite/gcc.target/i386/pr48723.c
===================================================================
--- testsuite/gcc.target/i386/pr48723.c (revision 0)
+++ testsuite/gcc.target/i386/pr48723.c (revision 0)
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-fstack-check -mavx" } */
+
+struct S0
+{
+  int f0, f1, f2, f3;
+} g_106;
+
+struct S0
+func_99 ()
+{
+  return (g_106);
+}