diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/combine.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index efcdea3..3e91601 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -6921,25 +6921,30 @@ nonzero_bits (x, mode) nonzero &= GET_MODE_MASK (ptr_mode); #endif - /* We may know something about the alignment of this register. - But if PUSH_ROUNDING is defined, it is possible for the +#ifdef STACK_BOUNDARY + /* If this is the stack pointer, we may know something about its + alignment. If PUSH_ROUNDING is defined, it is possible for the stack to be momentarily aligned only to that amount, so we pick the least alignment. */ - if (REGNO_POINTER_ALIGN (REGNO (x)) != 0) + if (x == stack_pointer_rtx || x == frame_pointer_rtx + || x == arg_pointer_rtx || x == hard_frame_pointer_rtx + || (REGNO (x) >= FIRST_VIRTUAL_REGISTER + && REGNO (x) <= LAST_VIRTUAL_REGISTER)) { - int alignment = REGNO_POINTER_ALIGN (REGNO (x)); + int sp_alignment = STACK_BOUNDARY / BITS_PER_UNIT; #ifdef PUSH_ROUNDING if (REGNO (x) == STACK_POINTER_REGNUM) - alignment = MIN (PUSH_ROUNDING (1), alignment); + sp_alignment = MIN (PUSH_ROUNDING (1), sp_alignment); #endif /* We must return here, otherwise we may get a worse result from one of the choices below. There is nothing useful below as far as the stack pointer is concerned. */ - return nonzero &= ~ (alignment - 1); + return nonzero &= ~ (sp_alignment - 1); } +#endif /* If X is a register whose nonzero bits value is current, use it. Otherwise, if X is a register whose value we can find, use that |