diff options
Diffstat (limited to 'gcc/lra-constraints.cc')
| -rw-r--r-- | gcc/lra-constraints.cc | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gcc/lra-constraints.cc b/gcc/lra-constraints.cc index 82cf0a829bf..d843226c8c8 100644 --- a/gcc/lra-constraints.cc +++ b/gcc/lra-constraints.cc @@ -4960,7 +4960,47 @@ curr_insn_transform (bool check_only_p) } lra_assert (done_p); } + int const_regno = -1; + rtx set; + rtx_insn *prev, *const_insn = NULL; + if (before != NULL_RTX && (prev = PREV_INSN (curr_insn)) != NULL_RTX + && (set = single_set (prev)) != NULL_RTX && CONSTANT_P (SET_SRC (set))) + { + rtx reg = SET_DEST (set); + if (GET_CODE (reg) == SUBREG) + reg = SUBREG_REG (reg); + /* Consider only reload insns as we don't want to change the order + created by previous optimizations. */ + if (REG_P (reg) && (int) REGNO (reg) >= lra_new_regno_start + && bitmap_bit_p (&lra_reg_info[REGNO (reg)].insn_bitmap, + INSN_UID (curr_insn))) + { + const_regno = REGNO (reg); + const_insn = prev; + } + } lra_process_new_insns (curr_insn, before, after, "Inserting insn reload"); + if (const_regno >= 0) { + bool move_p = true; + for (rtx_insn *insn = before; insn != curr_insn; insn = NEXT_INSN (insn)) + if (bitmap_bit_p (&lra_reg_info[const_regno].insn_bitmap, + INSN_UID (insn))) + { + move_p = false; + break; + } + if (move_p) + { + reorder_insns_nobb (const_insn, const_insn, PREV_INSN (curr_insn)); + if (lra_dump_file != NULL) + { + dump_insn_slim (lra_dump_file, const_insn); + fprintf (lra_dump_file, + " to decrease reg pressure, it is moved before:\n"); + dump_insn_slim (lra_dump_file, curr_insn); + } + } + } return change_p; } |