diff options
Diffstat (limited to 'gcc/avoid-store-forwarding.cc')
| -rw-r--r-- | gcc/avoid-store-forwarding.cc | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/avoid-store-forwarding.cc b/gcc/avoid-store-forwarding.cc index 1de6fd6..78ed736 100644 --- a/gcc/avoid-store-forwarding.cc +++ b/gcc/avoid-store-forwarding.cc @@ -145,11 +145,18 @@ is_store_forwarding (rtx store_mem, rtx load_mem, HOST_WIDE_INT *off_val) poly_int64 load_offset, store_offset; rtx load_base = strip_offset (XEXP (load_mem, 0), &load_offset); rtx store_base = strip_offset (XEXP (store_mem, 0), &store_offset); + poly_int64 off_diff = store_offset - load_offset; + + HOST_WIDE_INT off_val_tmp = 0; + bool is_off_diff_constant = off_diff.is_constant (&off_val_tmp); + if (off_val) + *off_val = off_val_tmp; + return (MEM_SIZE (load_mem).is_constant () && rtx_equal_p (load_base, store_base) && known_subrange_p (store_offset, MEM_SIZE (store_mem), load_offset, MEM_SIZE (load_mem)) - && (store_offset - load_offset).is_constant (off_val)); + && is_off_diff_constant); } /* Given a list of small stores that are forwarded to LOAD_INSN, try to |