+ if (qir_has_side_effects(c, inst))
+ continue;
+
+ if (inst->sf ||
+ has_nonremovable_reads(c, inst)) {
+ /* If we can't remove the instruction, but we
+ * don't need its destination value, just
+ * remove the destination. The register
+ * allocator would trivially color it and it
+ * wouldn't cause any register pressure, but
+ * it's nicer to read the QIR code without
+ * unused destination regs.
+ */
+ if (inst->dst.file == QFILE_TEMP) {
+ if (debug) {
+ fprintf(stderr,
+ "Removing dst from: ");
+ qir_dump_inst(c, inst);
+ fprintf(stderr, "\n");
+ }
+ c->defs[inst->dst.index] = NULL;
+ inst->dst.file = QFILE_NULL;
+ progress = true;
+ }
+ continue;
+ }
+
+ for (int i = 0; i < qir_get_nsrc(inst); i++) {
+ if (inst->src[i].file != QFILE_VPM)
+ continue;
+ uint32_t attr = inst->src[i].index / 4;
+ uint32_t offset = (inst->src[i].index % 4) * 4;
+
+ if (c->vattr_sizes[attr] == offset + 4) {
+ c->num_inputs--;
+ c->vattr_sizes[attr] -= 4;
+ }
+ }