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25 * @file vc4_opt_constant_folding.c
27 * Simple constant folding pass to clean up operations on only constants,
28 * which we might have generated within vc4_program.c.
32 #include "util/u_math.h"
37 dump_from(struct vc4_compile
*c
, struct qinst
*inst
)
42 fprintf(stderr
, "optimizing: ");
43 qir_dump_inst(c
, inst
);
44 fprintf(stderr
, "\n");
48 dump_to(struct vc4_compile
*c
, struct qinst
*inst
)
53 fprintf(stderr
, "to: ");
54 qir_dump_inst(c
, inst
);
55 fprintf(stderr
, "\n");
59 constant_fold(struct vc4_compile
*c
, struct qinst
*inst
)
61 int nsrc
= qir_get_op_nsrc(inst
->op
);
64 for (int i
= 0; i
< nsrc
; i
++) {
65 struct qreg reg
= inst
->src
[i
];
66 if (reg
.file
== QFILE_UNIF
&&
67 c
->uniform_contents
[reg
.index
] == QUNIFORM_CONSTANT
) {
68 ui
[i
] = c
->uniform_data
[reg
.index
];
69 } else if (reg
.file
== QFILE_SMALL_IMM
) {
79 result
= ui
[0] >> ui
[1];
88 inst
->src
[0] = qir_uniform_ui(c
, result
);
89 for (int i
= 1; i
< nsrc
; i
++)
90 inst
->src
[i
] = c
->undef
;
98 qir_opt_constant_folding(struct vc4_compile
*c
)
100 bool progress
= false;
102 list_for_each_entry(struct qinst
, inst
, &c
->instructions
, link
) {
103 if (constant_fold(c
, inst
))