diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.cpp | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 22e6e2e7368..35bce0f397c 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -2929,10 +2929,35 @@ bool fs_visitor::register_coalesce() { bool progress = false; + int if_depth = 0; + int loop_depth = 0; foreach_iter(exec_list_iterator, iter, this->instructions) { fs_inst *inst = (fs_inst *)iter.get(); + /* Make sure that we dominate the instructions we're going to + * scan for interfering with our coalescing, or we won't have + * scanned enough to see if anything interferes with our + * coalescing. We don't dominate the following instructions if + * we're in a loop or an if block. + */ + switch (inst->opcode) { + case BRW_OPCODE_DO: + loop_depth++; + break; + case BRW_OPCODE_WHILE: + loop_depth--; + break; + case BRW_OPCODE_IF: + if_depth++; + break; + case BRW_OPCODE_ENDIF: + if_depth--; + break; + } + if (loop_depth || if_depth) + continue; + if (inst->opcode != BRW_OPCODE_MOV || inst->predicated || inst->saturate || @@ -2950,14 +2975,6 @@ fs_visitor::register_coalesce() for (; scan_iter.has_next(); scan_iter.next()) { fs_inst *scan_inst = (fs_inst *)scan_iter.get(); - if (scan_inst->opcode == BRW_OPCODE_DO || - scan_inst->opcode == BRW_OPCODE_WHILE || - scan_inst->opcode == BRW_OPCODE_ENDIF) { - interfered = true; - iter = scan_iter; - break; - } - if (scan_inst->dst.file == GRF) { if (scan_inst->dst.reg == inst->dst.reg && (scan_inst->dst.reg_offset == inst->dst.reg_offset || @@ -2977,10 +2994,6 @@ fs_visitor::register_coalesce() continue; } - /* Update live interval so we don't have to recalculate. */ - this->virtual_grf_use[inst->src[0].reg] = MAX2(virtual_grf_use[inst->src[0].reg], - virtual_grf_use[inst->dst.reg]); - /* Rewrite the later usage to point at the source of the move to * be removed. */ @@ -3617,6 +3630,7 @@ brw_wm_fs_emit(struct brw_context *brw, struct brw_wm_compile *c) v.calculate_live_intervals(); progress = v.propagate_constants() || progress; progress = v.register_coalesce() || progress; + v.calculate_live_intervals(); progress = v.compute_to_mrf() || progress; progress = v.dead_code_eliminate() || progress; } while (progress); |