1259       foreach_inst_in_block_reverse_starting_from(vec4_instruction, scan_inst,  in opt_register_coalesce()
1261          _scan_inst = scan_inst;  in opt_register_coalesce()
1264                              scan_inst->dst, scan_inst->size_written)) {  in opt_register_coalesce()
1268                if (scan_inst->mlen)  in opt_register_coalesce()
1275                   if (scan_inst->is_math()) {  in opt_register_coalesce()
1287                 inst->dst.type != scan_inst->dst.type &&  in opt_register_coalesce()
1288                 !(scan_inst->opcode == BRW_OPCODE_MOV &&  in opt_register_coalesce()
1289                   scan_inst->dst.type == scan_inst->src[0].type))  in opt_register_coalesce()
1296             if (type_sz(inst->src[0].type) != type_sz(scan_inst->src[0].type))  in opt_register_coalesce()
1303             if (scan_inst->size_written != inst->size_written)  in opt_register_coalesce()
1307             if (!scan_inst->can_reswizzle(devinfo, inst->dst.writemask,  in opt_register_coalesce()
1317             if (DIV_ROUND_UP(scan_inst->size_written,  in opt_register_coalesce()
1318                              type_sz(scan_inst->dst.type)) > 8 ||  in opt_register_coalesce()
1319                 scan_inst->dst.offset != inst->src[0].offset)  in opt_register_coalesce()
1323 	    if (!scan_inst->predicate)  in opt_register_coalesce()
1324                chans_remaining &= ~scan_inst->dst.writemask;  in opt_register_coalesce()
1338                                 scan_inst->src[i], scan_inst->size_read(i)))  in opt_register_coalesce()
1348                              scan_inst->dst, scan_inst->size_written) &&  in opt_register_coalesce()
1349              (inst->dst.writemask & scan_inst->dst.writemask) != 0) {  in opt_register_coalesce()
1357          if (to_mrf && scan_inst->mlen > 0) {  in opt_register_coalesce()
1358             if (inst->dst.nr >= scan_inst->base_mrf &&  in opt_register_coalesce()
1359                 inst->dst.nr < scan_inst->base_mrf + scan_inst->mlen) {  in opt_register_coalesce()
1365                                    scan_inst->src[i], scan_inst->size_read(i)))  in opt_register_coalesce()
1379          vec4_instruction *scan_inst = _scan_inst;  in opt_register_coalesce()  local
1380 	 while (scan_inst != inst) {  in opt_register_coalesce()
1381 	    if (scan_inst->dst.file == VGRF &&  in opt_register_coalesce()
1382                 scan_inst->dst.nr == inst->src[0].nr &&  in opt_register_coalesce()
1383 		scan_inst->dst.offset == inst->src[0].offset) {  in opt_register_coalesce()
1384                scan_inst->reswizzle(inst->dst.writemask,  in opt_register_coalesce()
1386 	       scan_inst->dst.file = inst->dst.file;  in opt_register_coalesce()
1387                scan_inst->dst.nr = inst->dst.nr;  in opt_register_coalesce()
1388 	       scan_inst->dst.offset = inst->dst.offset;  in opt_register_coalesce()
1390                    inst->dst.type != scan_inst->dst.type) {  in opt_register_coalesce()
1396                   scan_inst->dst.type = inst->dst.type;  in opt_register_coalesce()
1397                   scan_inst->src[0].type = inst->src[0].type;  in opt_register_coalesce()
1399 	       scan_inst->saturate |= inst->saturate;  in opt_register_coalesce()
1401 	    scan_inst = (vec4_instruction *)scan_inst->next;  in opt_register_coalesce()