2 * Copyright © 2013 Intel Corporation
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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25 #include "brw_fs_live_variables.h"
28 /** @file brw_fs_saturate_propagation.cpp
30 * Implements a pass that propagates the SAT modifier from a MOV.SAT into the
31 * instruction that produced the source of the MOV.SAT, thereby allowing the
32 * MOV's src and dst to be coalesced and the MOV removed.
39 * would be transformed into
41 * ADD.SAT tmp, src0, src1
46 opt_saturate_propagation_local(fs_visitor
*v
, bblock_t
*block
)
48 bool progress
= false;
49 int ip
= block
->end_ip
+ 1;
51 foreach_inst_in_block_reverse(fs_inst
, inst
, block
) {
54 if (inst
->opcode
!= BRW_OPCODE_MOV
||
56 inst
->dst
.file
!= VGRF
||
57 inst
->dst
.type
!= inst
->src
[0].type
||
58 inst
->src
[0].file
!= VGRF
||
62 int src_var
= v
->live_intervals
->var_from_reg(inst
->src
[0]);
63 int src_end_ip
= v
->live_intervals
->end
[src_var
];
65 bool interfered
= false;
66 foreach_inst_in_block_reverse_starting_from(fs_inst
, scan_inst
, inst
) {
67 if (regions_overlap(scan_inst
->dst
, scan_inst
->size_written
,
68 inst
->src
[0], inst
->size_read(0))) {
69 if (scan_inst
->is_partial_write() ||
70 (scan_inst
->dst
.type
!= inst
->dst
.type
&&
71 !scan_inst
->can_change_types()))
74 if (scan_inst
->saturate
) {
75 inst
->saturate
= false;
77 } else if (src_end_ip
== ip
|| inst
->dst
.equals(inst
->src
[0])) {
78 if (scan_inst
->can_do_saturate()) {
79 if (scan_inst
->dst
.type
!= inst
->dst
.type
) {
80 scan_inst
->dst
.type
= inst
->dst
.type
;
81 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
82 scan_inst
->src
[i
].type
= inst
->dst
.type
;
86 if (inst
->src
[0].negate
) {
87 if (scan_inst
->opcode
== BRW_OPCODE_MUL
) {
88 scan_inst
->src
[0].negate
= !scan_inst
->src
[0].negate
;
89 inst
->src
[0].negate
= false;
90 } else if (scan_inst
->opcode
== BRW_OPCODE_MAD
) {
91 for (int i
= 0; i
< 2; i
++) {
92 if (scan_inst
->src
[i
].file
== IMM
) {
93 brw_negate_immediate(scan_inst
->src
[i
].type
,
94 &scan_inst
->src
[i
].as_brw_reg());
96 scan_inst
->src
[i
].negate
= !scan_inst
->src
[i
].negate
;
99 inst
->src
[0].negate
= false;
100 } else if (scan_inst
->opcode
== BRW_OPCODE_ADD
) {
101 if (scan_inst
->src
[1].file
== IMM
) {
102 if (!brw_negate_immediate(scan_inst
->src
[1].type
,
103 &scan_inst
->src
[1].as_brw_reg())) {
107 scan_inst
->src
[1].negate
= !scan_inst
->src
[1].negate
;
109 scan_inst
->src
[0].negate
= !scan_inst
->src
[0].negate
;
110 inst
->src
[0].negate
= false;
116 scan_inst
->saturate
= true;
117 inst
->saturate
= false;
123 for (int i
= 0; i
< scan_inst
->sources
; i
++) {
124 if (scan_inst
->src
[i
].file
== VGRF
&&
125 scan_inst
->src
[i
].nr
== inst
->src
[0].nr
&&
126 scan_inst
->src
[i
].offset
/ REG_SIZE
==
127 inst
->src
[0].offset
/ REG_SIZE
) {
128 if (scan_inst
->opcode
!= BRW_OPCODE_MOV
||
129 !scan_inst
->saturate
||
130 scan_inst
->src
[0].abs
||
131 scan_inst
->src
[0].negate
||
132 scan_inst
->src
[0].abs
!= inst
->src
[0].abs
||
133 scan_inst
->src
[0].negate
!= inst
->src
[0].negate
) {
149 fs_visitor::opt_saturate_propagation()
151 bool progress
= false;
153 calculate_live_intervals();
155 foreach_block (block
, cfg
) {
156 progress
= opt_saturate_propagation_local(this, block
) || progress
;
159 /* Live intervals are still valid. */