diff options
Diffstat (limited to 'gcc/explow.c')
| -rw-r--r-- | gcc/explow.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/gcc/explow.c b/gcc/explow.c index a345690..f97a214 100644 --- a/gcc/explow.c +++ b/gcc/explow.c @@ -1224,9 +1224,15 @@ 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; @@ -1235,7 +1241,7 @@ get_dynamic_stack_size (rtx *psize, unsigned size_align, size_align = BITS_PER_UNIT; /* Round the size to a multiple of the required stack alignment. - Since the stack if presumed to be rounded before this allocation, + Since the stack is presumed to be rounded before this allocation, this will maintain the required alignment. If the stack grows downward, we could save an insn by subtracting |