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Avoid bitset clearing and copying

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This commit is contained in:
Dmitry Stogov 2022-11-15 22:52:27 +03:00
parent f72bb45e07
commit f72e6dc388
1 changed files with 12 additions and 8 deletions
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20
ir_ra.c
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@ -349,7 +349,7 @@ int ir_compute_live_ranges(ir_ctx *ctx)
#ifdef IR_DEBUG
ir_bitset visited;
#endif
ir_bitset live;
ir_bitset live, bb_live;
ir_bitset loops = NULL;
ir_bitqueue queue;
ir_reg reg;
@ -364,7 +364,7 @@ int ir_compute_live_ranges(ir_ctx *ctx)
visited = ir_bitset_malloc(ctx->cfg_blocks_count + 1);
#endif
len = ir_bitset_len(ctx->vregs_count + 1);
live = ir_bitset_malloc((ctx->cfg_blocks_count + 1) * len * 8 * sizeof(*live));
bb_live = ir_mem_malloc((ctx->cfg_blocks_count + 1) * len * sizeof(ir_bitset_base_t));
ctx->live_intervals = ir_mem_calloc(ctx->vregs_count + 1 + IR_REG_NUM + 1, sizeof(ir_live_interval*));
for (b = ctx->cfg_blocks_count; b > 0; b--) {
bb = &ctx->cfg_blocks[b];
@ -375,6 +375,7 @@ int ir_compute_live_ranges(ir_ctx *ctx)
#ifdef IR_DEBUG
ir_bitset_incl(visited, b);
#endif
live = bb_live + (len * b);
if (bb->successors_count == 0) {
ir_bitset_clear(live, len);
}
@ -386,9 +387,15 @@ int ir_compute_live_ranges(ir_ctx *ctx)
#endif
/* live = union of successors.liveIn */
if (i == 0) {
ir_bitset_copy(live, live + (len * succ), len);
if (EXPECTED(succ > b)) {
ir_bitset_copy(live, bb_live + (len * succ), len);
} else {
IR_ASSERT(ctx->cfg_blocks[succ].flags & IR_BB_LOOP_HEADER);
ir_bitset_clear(live, len);
}
} else {
ir_bitset_union(live, live + (len * succ), len);
IR_ASSERT(succ > b);
ir_bitset_union(live, bb_live + (len * succ), len);
}
/* for each phi function phi of successor */
succ_bb = &ctx->cfg_blocks[succ];
@ -637,9 +644,6 @@ int ir_compute_live_ranges(ir_ctx *ctx)
}
} while ((child = ir_bitqueue_pop(&queue)) >= 0);
}
/* b.liveIn = live */
ir_bitset_copy(live + (len * b), live, len);
}
if (unused) {
@ -651,7 +655,7 @@ int ir_compute_live_ranges(ir_ctx *ctx)
ir_bitqueue_free(&queue);
}
ir_mem_free(live);
ir_mem_free(bb_live);
#ifdef IR_DEBUG
ir_mem_free(visited);
#endif