diff options
Diffstat (limited to 'gcc/local-alloc.c')
| -rw-r--r-- | gcc/local-alloc.c | 43 |
1 files changed, 33 insertions, 10 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index ac2183e02f4..62142f04c38 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -804,8 +804,11 @@ update_equiv_regs () rtx insn; int block; int loop_depth; + regset_head cleared_regs; + int clear_regnos = 0; reg_equiv = (struct equivalence *) xcalloc (max_regno, sizeof *reg_equiv); + INIT_REG_SET (&cleared_regs); init_alias_analysis (); @@ -1135,7 +1138,6 @@ update_equiv_regs () INSN. Update the flow information. */ else if (PREV_INSN (insn) != equiv_insn) { - int l; rtx new_insn; new_insn = emit_insn_before (copy_rtx (PATTERN (equiv_insn)), @@ -1156,22 +1158,43 @@ update_equiv_regs () if (block >= 0 && insn == BLOCK_HEAD (block)) BLOCK_HEAD (block) = PREV_INSN (insn); - for (l = 0; l < n_basic_blocks; l++) - { - CLEAR_REGNO_REG_SET ( - BASIC_BLOCK (l)->global_live_at_start, - regno); - CLEAR_REGNO_REG_SET ( - BASIC_BLOCK (l)->global_live_at_end, - regno); - } + /* Remember to clear REGNO from all basic block's live + info. */ + SET_REGNO_REG_SET (&cleared_regs, regno); + clear_regnos++; } } } } + /* Clear all dead REGNOs from all basic block's live info. */ + if (clear_regnos) + { + int j, l; + if (clear_regnos > 8) + { + for (l = 0; l < n_basic_blocks; l++) + { + AND_COMPL_REG_SET (BASIC_BLOCK (l)->global_live_at_start, + &cleared_regs); + AND_COMPL_REG_SET (BASIC_BLOCK (l)->global_live_at_end, + &cleared_regs); + } + } + else + EXECUTE_IF_SET_IN_REG_SET (&cleared_regs, 0, j, + { + for (l = 0; l < n_basic_blocks; l++) + { + CLEAR_REGNO_REG_SET (BASIC_BLOCK (l)->global_live_at_start, j); + CLEAR_REGNO_REG_SET (BASIC_BLOCK (l)->global_live_at_end, j); + } + }); + } + /* Clean up. */ end_alias_analysis (); + CLEAR_REG_SET (&cleared_regs); free (reg_equiv); } |