try_eliminate_instruction(vec4_instruction *inst, int new_writemask,
const struct brw_context *brw)
{
+ if (inst->has_side_effects())
+ return false;
+
if (new_writemask == 0) {
/* Don't dead code eliminate instructions that write to the
* accumulator as a side-effect. Instead just set the destination
seen_control_flow = inst->is_control_flow() || seen_control_flow;
- if (inst->has_side_effects())
- continue;
-
bool inst_writes_flag = false;
if (inst->dst.file != GRF) {
if (inst->dst.is_null() && inst->writes_flag()) {
node = prev, prev = prev->prev) {
vec4_instruction *scan_inst = (vec4_instruction *)node;
- if (scan_inst->has_side_effects())
- continue;
-
if (inst_writes_flag) {
if (scan_inst->dst.is_null() && scan_inst->writes_flag()) {
scan_inst->remove();
progress = true;
+ continue;
} else if (scan_inst->reads_flag()) {
- dead_channels = 0;
+ break;
}
- continue;
- } else if (scan_inst->dst.file != GRF) {
- continue;
}
- if (inst->dst.reg == scan_inst->dst.reg) {
+ if (inst->dst.file == scan_inst->dst.file &&
+ inst->dst.reg == scan_inst->dst.reg) {
int new_writemask = scan_inst->dst.writemask & ~dead_channels;
progress = try_eliminate_instruction(scan_inst, new_writemask, brw) ||
}
for (int i = 0; i < 3; i++) {
- if (scan_inst->src[i].file != GRF ||
+ if (scan_inst->src[i].file != inst->dst.file ||
scan_inst->src[i].reg != inst->dst.reg)
continue;