dc4b5bc3c38ecc82f3e0ade6caeacf9ce18b64cd
2 * Copyright © 2014 Broadcom
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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.
40 qir_opt_copy_propagation(struct qcompile
*c
)
42 bool progress
= false;
43 struct simple_node
*node
;
45 struct qreg
*movs
= calloc(c
->num_temps
, sizeof(struct qreg
));
47 foreach(node
, &c
->instructions
) {
48 struct qinst
*inst
= (struct qinst
*)node
;
50 for (int i
= 0; i
< qir_get_op_nsrc(inst
->op
); i
++) {
51 int index
= inst
->src
[i
].index
;
52 if (inst
->src
[i
].file
== QFILE_TEMP
&&
53 movs
[index
].file
== QFILE_TEMP
) {
55 fprintf(stderr
, "Copy propagate: ");
57 fprintf(stderr
, "\n");
60 inst
->src
[i
] = movs
[index
];
63 fprintf(stderr
, "to: ");
65 fprintf(stderr
, "\n");
72 if (inst
->op
== QOP_MOV
&& inst
->dst
.file
== QFILE_TEMP
)
73 movs
[inst
->dst
.index
] = inst
->src
[0];