diff options
Diffstat (limited to 'gcc/flow.c')
| -rw-r--r-- | gcc/flow.c | 23 |
1 files changed, 11 insertions, 12 deletions
@@ -4028,7 +4028,7 @@ mark_set_1 (needed, dead, x, insn, significant, flags) /* Count (weighted) references, stores, etc. This counts a register twice if it is modified, but that is correct. */ REG_N_SETS (regno)++; - REG_N_REFS (regno) += loop_depth; + REG_N_REFS (regno) += loop_depth + 1; /* The insns where a reg is live are normally counted elsewhere, but we want the count to include the insn @@ -4281,7 +4281,7 @@ find_auto_inc (needed, x, insn) /* Count an extra reference to the reg. When a reg is incremented, spilling it is worse, so we want to make that less likely. */ - REG_N_REFS (regno) += loop_depth; + REG_N_REFS (regno) += loop_depth + 1; /* Count the increment as a setting of the register, even though it isn't a SET in rtl. */ @@ -4502,7 +4502,7 @@ mark_used_regs (needed, live, x, flags, insn) /* Count (weighted) number of uses of each reg. */ - REG_N_REFS (regno) += loop_depth; + REG_N_REFS (regno) += loop_depth + 1; } } @@ -4745,7 +4745,7 @@ try_pre_increment_1 (insn) less likely. */ if (regno >= FIRST_PSEUDO_REGISTER) { - REG_N_REFS (regno) += loop_depth; + REG_N_REFS (regno) += loop_depth + 1; REG_N_SETS (regno)++; } return 1; @@ -5372,8 +5372,7 @@ count_reg_sets_1 (x) /* Count (weighted) references, stores, etc. This counts a register twice if it is modified, but that is correct. */ REG_N_SETS (regno)++; - - REG_N_REFS (regno) += loop_depth; + REG_N_REFS (regno) += loop_depth + 1; } } } @@ -5452,7 +5451,7 @@ count_reg_references (x) case REG: if (REGNO (x) >= FIRST_PSEUDO_REGISTER) - REG_N_REFS (REGNO (x)) += loop_depth; + REG_N_REFS (REGNO (x)) += loop_depth + 1; return; case SET: @@ -5551,9 +5550,10 @@ count_reg_references (x) More accurate reference counts generally lead to better register allocation. F is the first insn to be scanned. + LOOP_STEP denotes how much loop_depth should be incremented per - loop nesting level in order to increase the ref count more for references - in a loop. + loop nesting level in order to increase the ref count more for + references in a loop. It might be worthwhile to update REG_LIVE_LENGTH, REG_BASIC_BLOCK and possibly other information which is used by the register allocators. */ @@ -5577,7 +5577,6 @@ recompute_reg_usage (f, loop_step) /* Scan each insn in the chain and count how many times each register is set/used. */ - loop_depth = 1; for (index = 0; index < n_basic_blocks; index++) { basic_block bb = BASIC_BLOCK (index); @@ -6819,7 +6818,7 @@ static int flow_loops_level_compute (loops) struct loops *loops; { - return flow_loop_level_compute (loops->tree, 0); + return flow_loop_level_compute (loops->tree, 1); } @@ -6862,7 +6861,7 @@ flow_loops_find (loops) num_loops = 0; for (b = 0; b < n_basic_blocks; b++) { - BASIC_BLOCK (b)->loop_depth = 1; + BASIC_BLOCK (b)->loop_depth = 0; for (e = BASIC_BLOCK (b)->pred; e; e = e->pred_next) { basic_block latch = e->src; |