diff options
Diffstat (limited to 'gcc/explow.c')
| -rw-r--r-- | gcc/explow.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/gcc/explow.c b/gcc/explow.c index 13736a586d8..638dc5f8f0f 100644 --- a/gcc/explow.c +++ b/gcc/explow.c @@ -1240,15 +1240,20 @@ 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); - - if (flag_stack_usage_info && pstack_usage_size) - *pstack_usage_size += extra; + /* Since the stack is presumed to be aligned before this allocation, + we only need to increase the size of the allocation if the required + alignment is more than the stack alignment. */ + if (required_align > STACK_BOUNDARY) + { + extra = (required_align - STACK_BOUNDARY) / BITS_PER_UNIT; + size = plus_constant (Pmode, size, extra); + size = force_operand (size, NULL_RTX); + if (size_align > STACK_BOUNDARY) + size_align = STACK_BOUNDARY; - if (extra && size_align > BITS_PER_UNIT) - size_align = BITS_PER_UNIT; + if (flag_stack_usage_info && pstack_usage_size) + *pstack_usage_size += extra; + } /* Round the size to a multiple of the required stack alignment. Since the stack is presumed to be rounded before this allocation, |