diff options
Diffstat (limited to 'gcc/avoid-store-forwarding.cc')
| -rw-r--r-- | gcc/avoid-store-forwarding.cc | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/gcc/avoid-store-forwarding.cc b/gcc/avoid-store-forwarding.cc index 37e0953..785efd2 100644 --- a/gcc/avoid-store-forwarding.cc +++ b/gcc/avoid-store-forwarding.cc @@ -119,17 +119,6 @@ generate_bit_insert_sequence (store_fwd_info *store_info, rtx dest) unsigned HOST_WIDE_INT bitsize = store_size * BITS_PER_UNIT; unsigned HOST_WIDE_INT start = store_info->offset * BITS_PER_UNIT; - /* Adjust START for machines with BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN. - Given that the bytes will be reversed in this case, we need to - calculate the starting position from the end of the destination - register. */ - if (BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN) - { - unsigned HOST_WIDE_INT load_mode_bitsize - = (GET_MODE_BITSIZE (GET_MODE (dest))).to_constant (); - start = load_mode_bitsize - bitsize - start; - } - rtx mov_reg = store_info->mov_reg; store_bit_field (dest, bitsize, start, 0, 0, GET_MODE (mov_reg), mov_reg, false, false); @@ -248,11 +237,14 @@ process_store_forwarding (vec<store_fwd_info> &stores, rtx_insn *load_insn, { it->mov_reg = gen_reg_rtx (GET_MODE (it->store_mem)); rtx_insn *insns = NULL; - const bool has_zero_offset = it->offset == 0; + const bool has_base_offset + = known_eq (poly_uint64 (it->offset), + subreg_size_lowpart_offset (MEM_SIZE (it->store_mem), + load_size)); /* If we're eliminating the load then find the store with zero offset and use it as the base register to avoid a bit insert if possible. */ - if (load_elim && has_zero_offset) + if (load_elim && has_base_offset) { start_sequence (); |