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re PR middle-end/46894 (vector tests fail on powerpc 32-bit) 

PR middle-end/46894
	* explow.c (allocate_dynamic_stack_space): Do not assume more than
	BITS_PER_UNIT alignment if STACK_DYNAMIC_OFFSET or STACK_POINTER_OFFSET
	are defined.

From-SVN: r168968
This commit is contained in:
Eric Botcazou 2011-01-18 21:29:11 +00:00 committed by Eric Botcazou
parent d4f2460a1b
commit 1ecad98e4d
2 changed files with 19 additions and 7 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-01-18 Eric Botcazou <ebotcazou@adacore.com>
PR middle-end/46894
* explow.c (allocate_dynamic_stack_space): Do not assume more than
BITS_PER_UNIT alignment if STACK_DYNAMIC_OFFSET or STACK_POINTER_OFFSET
are defined.
2011-01-18 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
PR tree-optimization/47179

19
gcc/explow.c
View File

@ -1148,6 +1148,7 @@ allocate_dynamic_stack_space (rtx size, unsigned size_align,
{
HOST_WIDE_INT stack_usage_size = -1;
rtx final_label, final_target, target;
unsigned extra_align = 0;
bool must_align;
/* If we're asking for zero bytes, it doesn't matter what we point
@ -1231,21 +1232,25 @@ allocate_dynamic_stack_space (rtx size, unsigned size_align,
that might result from the alignment operation. */
must_align = (crtl->preferred_stack_boundary < required_align);
#if defined (STACK_DYNAMIC_OFFSET) || defined (STACK_POINTER_OFFSET)
must_align = true;
#endif
if (must_align)
{
unsigned extra, extra_align;
if (required_align > PREFERRED_STACK_BOUNDARY)
extra_align = PREFERRED_STACK_BOUNDARY;
else if (required_align > STACK_BOUNDARY)
extra_align = STACK_BOUNDARY;
else
extra_align = BITS_PER_UNIT;
extra = (required_align - extra_align) / BITS_PER_UNIT;
}
/* ??? STACK_POINTER_OFFSET is always defined now. */
#if defined (STACK_DYNAMIC_OFFSET) || defined (STACK_POINTER_OFFSET)
must_align = true;
extra_align = BITS_PER_UNIT;
#endif
if (must_align)
{
unsigned extra = (required_align - extra_align) / BITS_PER_UNIT;
size = plus_constant (size, extra);
size = force_operand (size, NULL_RTX);