diff options
| author | Dominik Vogt <vogt@linux.vnet.ibm.com> | 2016-11-18 14:44:54 +0000 |
|---|---|---|
| committer | Andreas Krebbel <krebbel@gcc.gnu.org> | 2016-11-18 14:44:54 +0000 |
| commit | d79318594936bb80dc5a0b82c70346249c49e5b0 (patch) | |
| tree | bd8a56796bce7c461774d60a3022c45d1aeb7b69 /gcc/explow.c | |
| parent | a7790c7174a016fcea0af852a493479f0dadfdf3 (diff) | |
| download | gcc-d79318594936bb80dc5a0b82c70346249c49e5b0.tar.gz | |
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
Diffstat (limited to 'gcc/explow.c')
| -rw-r--r-- | gcc/explow.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/gcc/explow.c b/gcc/explow.c index 75af333c1c3..6758cca87e7 100644 --- a/gcc/explow.c +++ b/gcc/explow.c @@ -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; |