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Re-apply: Drop excess size used for run time allocated stack variables. 

The patch got reverted after hitting PR77359 which turned out to be a
rs6000 backend problem.  Reapplying after the PR got fixed.

gcc/ChangeLog:

2016-11-18  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	Re-apply after PR bootstrap/77359 is fixed:
	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.

--This line, and those below, will be
ignored--

M    gcc/ChangeLog
M    gcc/explow.c

From-SVN: r242590
This commit is contained in:
Dominik Vogt 2016-11-18 14:44:54 +00:00 committed by Andreas Krebbel
parent a7790c7174
commit d793185949
2 changed files with 18 additions and 3 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2016-11-18 Dominik Vogt <vogt@linux.vnet.ibm.com>
Re-apply after PR bootstrap/77359 is fixed:
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.
2016-11-18 Dominik Vogt <vogt@linux.vnet.ibm.com>
PR bootstrap/77359

12
gcc/explow.c
View File

@ -1233,9 +1233,15 @@ 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. */
extra = (required_align - BITS_PER_UNIT) / BITS_PER_UNIT;
size = plus_constant (Pmode, size, extra);
size = force_operand (size, NULL_RTX);
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);
}
if (flag_stack_usage_info && pstack_usage_size)
*pstack_usage_size += extra;