f8c49a44bd3b70d3fbf1e0aafcc4a801f3fa4115
2 * Copyright © 2014 Broadcom
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5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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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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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
25 * @file vc4_opt_copy_propagation.c
27 * This implements simple copy propagation for QIR without control flow.
29 * For each temp, it keeps a qreg of which source it was MOVed from, if it
30 * was. If we see that used later, we can just reuse the source value, since
31 * we know we don't have control flow, and we have SSA for our values so
32 * there's no killing to worry about.
38 qir_opt_copy_propagation(struct vc4_compile
*c
)
40 bool progress
= false;
41 struct simple_node
*node
;
43 struct qreg
*movs
= calloc(c
->num_temps
, sizeof(struct qreg
));
44 struct qinst
**defs
= calloc(c
->num_temps
, sizeof(struct qreg
));
46 foreach(node
, &c
->instructions
) {
47 struct qinst
*inst
= (struct qinst
*)node
;
49 if (inst
->dst
.file
== QFILE_TEMP
)
50 defs
[inst
->dst
.index
] = inst
;
52 for (int i
= 0; i
< qir_get_op_nsrc(inst
->op
); i
++) {
53 int index
= inst
->src
[i
].index
;
54 if (inst
->src
[i
].file
== QFILE_TEMP
&&
55 (movs
[index
].file
== QFILE_TEMP
||
56 movs
[index
].file
== QFILE_UNIF
)) {
58 fprintf(stderr
, "Copy propagate: ");
59 qir_dump_inst(c
, inst
);
60 fprintf(stderr
, "\n");
63 inst
->src
[i
] = movs
[index
];
66 fprintf(stderr
, "to: ");
67 qir_dump_inst(c
, inst
);
68 fprintf(stderr
, "\n");
75 if (inst
->op
== QOP_MOV
&&
76 inst
->dst
.file
== QFILE_TEMP
&&
77 inst
->src
[0].file
!= QFILE_VPM
&&
78 !(inst
->src
[0].file
== QFILE_TEMP
&&
79 (defs
[inst
->src
[0].index
]->op
== QOP_TEX_RESULT
||
80 defs
[inst
->src
[0].index
]->op
== QOP_TLB_COLOR_READ
))) {
81 movs
[inst
->dst
.index
] = inst
->src
[0];