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Make sure that all variable sized adjustments are multiple of preferred 

stack boundary after stack alignment.
    
gcc/

2010-09-20  H.J. Lu  <hongjiu.lu@intel.com>

	Backport from mainline
	2010-09-17  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/45234
	* calls.c (expand_call): Make sure that all variable sized
	adjustments are multiple of preferred stack boundary after
	stack alignment.

gcc/testsuite/

2010-09-20  H.J. Lu  <hongjiu.lu@intel.com>

	Backport from mainline
	2010-09-17  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/45234
	* gcc.dg/torture/stackalign/alloca-5.c: New.

From-SVN: r164453
This commit is contained in:
H.J. Lu 2010-09-20 20:32:41 +00:00 committed by H.J. Lu
parent f3e61810ac
commit 8d8fc970e8
4 changed files with 63 additions and 0 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2010-09-20 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline
2010-09-17 H.J. Lu <hongjiu.lu@intel.com>
PR middle-end/45234
* calls.c (expand_call): Make sure that all variable sized
adjustments are multiple of preferred stack boundary after
stack alignment.
2010-09-18 Richard Guenther <rguenther@suse.de>
PR tree-optimization/45709

13
gcc/calls.c
View File

@ -2374,6 +2374,19 @@ expand_call (tree exp, rtx target, int ignore)
preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT;
if (SUPPORTS_STACK_ALIGNMENT)
{
/* All variable sized adjustments must be multiple of preferred
stack boundary. Stack alignment may change preferred stack
boundary after variable sized adjustments have been made. We
need to compensate it here. */
unsigned HOST_WIDE_INT delta
= ((stack_pointer_delta - pending_stack_adjust)
% preferred_unit_stack_boundary);
if (delta)
anti_adjust_stack (GEN_INT (preferred_unit_stack_boundary - delta));
}
/* We want to make two insn chains; one for a sibling call, the other
for a normal call. We will select one of the two chains after
initial RTL generation is complete. */

8
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,11 @@
2010-09-20 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline
2010-09-17 H.J. Lu <hongjiu.lu@intel.com>
PR middle-end/45234
* gcc.dg/torture/stackalign/alloca-5.c: New.
2010-09-18 Richard Guenther <rguenther@suse.de>
PR tree-optimization/45709

32
gcc/testsuite/gcc.dg/torture/stackalign/alloca-5.c Normal file
View File

@ -0,0 +1,32 @@
/* PR middle-end/45234 */
/* { dg-do run { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
/* { dg-options "-m32 -mincoming-stack-boundary=2 -mpreferred-stack-boundary=2" } */
#include "check.h"
void
__attribute__ ((noinline))
bar (__float128 f)
{
check (&f, __alignof__(f));
}
int
main (void)
{
char *p = __builtin_alloca (6);
bar (0);
__builtin_strncpy (p, "good", 5);
if (__builtin_strncmp (p, "good", 5) != 0)
{
#ifdef DEBUG
p[size] = '\0';
printf ("Failed: %s != good\n", p);
#endif
abort ();
}
return 0;
}