diff options
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 79 |
1 files changed, 66 insertions, 13 deletions
@@ -925,9 +925,22 @@ move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len, data.to_addr = copy_addr_to_reg (to_addr); } - if (! SLOW_UNALIGNED_ACCESS (word_mode, align) - || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT) - align = MOVE_MAX * BITS_PER_UNIT; + tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1); + if (align >= GET_MODE_ALIGNMENT (tmode)) + align = GET_MODE_ALIGNMENT (tmode); + else + { + enum machine_mode xmode; + + for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode; + tmode != VOIDmode; + xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode)) + if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES + || SLOW_UNALIGNED_ACCESS (tmode, align)) + break; + + align = MAX (align, GET_MODE_ALIGNMENT (xmode)); + } /* First move what we can in the largest integer mode, then go to successively smaller modes. */ @@ -992,14 +1005,28 @@ move_by_pieces_ninsns (unsigned HOST_WIDE_INT l, unsigned int align, unsigned int max_size) { unsigned HOST_WIDE_INT n_insns = 0; + enum machine_mode tmode; - if (! SLOW_UNALIGNED_ACCESS (word_mode, align) - || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT) - align = MOVE_MAX * BITS_PER_UNIT; + tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1); + if (align >= GET_MODE_ALIGNMENT (tmode)) + align = GET_MODE_ALIGNMENT (tmode); + else + { + enum machine_mode tmode, xmode; + + for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode; + tmode != VOIDmode; + xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode)) + if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES + || SLOW_UNALIGNED_ACCESS (tmode, align)) + break; + + align = MAX (align, GET_MODE_ALIGNMENT (xmode)); + } while (max_size > 1) { - enum machine_mode mode = VOIDmode, tmode; + enum machine_mode mode = VOIDmode; enum insn_code icode; for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT); @@ -1999,9 +2026,22 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len, if (! STORE_BY_PIECES_P (len, align)) return 0; - if (! SLOW_UNALIGNED_ACCESS (word_mode, align) - || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT) - align = MOVE_MAX * BITS_PER_UNIT; + tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1); + if (align >= GET_MODE_ALIGNMENT (tmode)) + align = GET_MODE_ALIGNMENT (tmode); + else + { + enum machine_mode xmode; + + for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode; + tmode != VOIDmode; + xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode)) + if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES + || SLOW_UNALIGNED_ACCESS (tmode, align)) + break; + + align = MAX (align, GET_MODE_ALIGNMENT (xmode)); + } /* We would first store what we can in the largest integer mode, then go to successively smaller modes. */ @@ -2201,9 +2241,22 @@ store_by_pieces_1 (struct store_by_pieces *data ATTRIBUTE_UNUSED, data->to_addr = copy_addr_to_reg (to_addr); } - if (! SLOW_UNALIGNED_ACCESS (word_mode, align) - || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT) - align = MOVE_MAX * BITS_PER_UNIT; + tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1); + if (align >= GET_MODE_ALIGNMENT (tmode)) + align = GET_MODE_ALIGNMENT (tmode); + else + { + enum machine_mode xmode; + + for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode; + tmode != VOIDmode; + xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode)) + if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES + || SLOW_UNALIGNED_ACCESS (tmode, align)) + break; + + align = MAX (align, GET_MODE_ALIGNMENT (xmode)); + } /* First store what we can in the largest integer mode, then go to successively smaller modes. */ |