1294       foreach_inst_in_block_reverse_starting_from(vec4_instruction, scan_inst,  in opt_register_coalesce()
1296          _scan_inst = scan_inst;  in opt_register_coalesce()
1299                              scan_inst->dst, scan_inst->size_written)) {  in opt_register_coalesce()
1303                if (scan_inst->mlen)  in opt_register_coalesce()
1310                   if (scan_inst->is_math()) {  in opt_register_coalesce()
1322             if (scan_inst->opcode == VS_OPCODE_UNPACK_FLAGS_SIMD4X2)  in opt_register_coalesce()
1331                 inst->dst.type != scan_inst->dst.type &&  in opt_register_coalesce()
1332                 !(scan_inst->opcode == BRW_OPCODE_MOV &&  in opt_register_coalesce()
1333                   scan_inst->dst.type == scan_inst->src[0].type))  in opt_register_coalesce()
1340             if (type_sz(inst->src[0].type) != type_sz(scan_inst->src[0].type))  in opt_register_coalesce()
1347             if (scan_inst->size_written != inst->size_written)  in opt_register_coalesce()
1351             if (!scan_inst->can_reswizzle(devinfo, inst->dst.writemask,  in opt_register_coalesce()
1361             if (DIV_ROUND_UP(scan_inst->size_written,  in opt_register_coalesce()
1362                              type_sz(scan_inst->dst.type)) > 8 ||  in opt_register_coalesce()
1363                 scan_inst->dst.offset != inst->src[0].offset)  in opt_register_coalesce()
1367 	    if (!scan_inst->predicate)  in opt_register_coalesce()
1368                chans_remaining &= ~scan_inst->dst.writemask;  in opt_register_coalesce()
1382                                 scan_inst->src[i], scan_inst->size_read(i)))  in opt_register_coalesce()
1392                              scan_inst->dst, scan_inst->size_written) &&  in opt_register_coalesce()
1393              (inst->dst.writemask & scan_inst->dst.writemask) != 0) {  in opt_register_coalesce()
1401          if (to_mrf && scan_inst->mlen > 0) {  in opt_register_coalesce()
1402             unsigned start = scan_inst->base_mrf;  in opt_register_coalesce()
1403             unsigned end = scan_inst->base_mrf + scan_inst->mlen;  in opt_register_coalesce()
1411                                    scan_inst->src[i], scan_inst->size_read(i)))  in opt_register_coalesce()
1425          vec4_instruction *scan_inst = _scan_inst;  in opt_register_coalesce()  local
1426 	 while (scan_inst != inst) {  in opt_register_coalesce()
1427 	    if (scan_inst->dst.file == VGRF &&  in opt_register_coalesce()
1428                 scan_inst->dst.nr == inst->src[0].nr &&  in opt_register_coalesce()
1429 		scan_inst->dst.offset == inst->src[0].offset) {  in opt_register_coalesce()
1430                scan_inst->reswizzle(inst->dst.writemask,  in opt_register_coalesce()
1432 	       scan_inst->dst.file = inst->dst.file;  in opt_register_coalesce()
1433                scan_inst->dst.nr = inst->dst.nr;  in opt_register_coalesce()
1434 	       scan_inst->dst.offset = inst->dst.offset;  in opt_register_coalesce()
1436                    inst->dst.type != scan_inst->dst.type) {  in opt_register_coalesce()
1442                   scan_inst->dst.type = inst->dst.type;  in opt_register_coalesce()
1443                   scan_inst->src[0].type = inst->src[0].type;  in opt_register_coalesce()
1445 	       scan_inst->saturate |= inst->saturate;  in opt_register_coalesce()
1447 	    scan_inst = (vec4_instruction *)scan_inst->next;  in opt_register_coalesce()