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Revert "Drop excess size used for run time allocated stack variables." 

This patch caused a bootstrap failure on AIX.

2016-08-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	Revert
	2016-08-23  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* explow.c (get_dynamic_stack_size): Take known alignment of stack
	pointer + STACK_DYNAMIC_OFFSET into account when calculating the
	size needed.

From-SVN: r239735
This commit is contained in:
Andreas Krebbel 2016-08-24 10:56:37 +00:00 committed by Andreas Krebbel
parent 0630b8ec3d
commit b9553e20ad
2 changed files with 12 additions and 9 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2016-08-24 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
Revert
2016-08-23 Dominik Vogt <vogt@linux.vnet.ibm.com>
* explow.c (get_dynamic_stack_size): Take known alignment of stack
pointer + STACK_DYNAMIC_OFFSET into account when calculating the size
needed.
2016-08-24 Thomas Preud'homme <thomas.preudhomme@arm.com>
* doc/fragments.texi (MULTILIB_REUSE): Mention that only options in

12
gcc/explow.c
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@ -1224,15 +1224,9 @@ get_dynamic_stack_size (rtx *psize, unsigned size_align,
example), so we must preventively align the value. We leave space
in SIZE for the hole that might result from the alignment operation. */
unsigned known_align = REGNO_POINTER_ALIGN (VIRTUAL_STACK_DYNAMIC_REGNUM);
if (known_align == 0)
known_align = BITS_PER_UNIT;
if (required_align > known_align)
{
extra = (required_align - known_align) / BITS_PER_UNIT;
size = plus_constant (Pmode, size, extra);
size = force_operand (size, NULL_RTX);
}
extra = (required_align - BITS_PER_UNIT) / BITS_PER_UNIT;
size = plus_constant (Pmode, size, extra);
size = force_operand (size, NULL_RTX);
if (flag_stack_usage_info && pstack_usage_size)
*pstack_usage_size += extra;