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25 #include "brw_fs_live_variables.h"
28 /** @file brw_fs_saturate_propagation.cpp
32 opt_saturate_propagation_local(fs_visitor
*v
, bblock_t
*block
)
34 bool progress
= false;
35 int ip
= block
->start_ip
;
37 for (fs_inst
*inst
= (fs_inst
*)block
->start
;
38 inst
!= block
->end
->next
;
39 inst
= (fs_inst
*) inst
->next
) {
42 if (inst
->opcode
!= BRW_OPCODE_MOV
||
43 inst
->dst
.file
!= GRF
||
47 int src_var
= v
->live_intervals
->var_from_reg(&inst
->src
[0]);
48 int src_end_ip
= v
->live_intervals
->end
[src_var
];
49 if (src_end_ip
> ip
&& !inst
->dst
.equals(inst
->src
[0]))
53 bool interfered
= false;
54 for (fs_inst
*scan_inst
= (fs_inst
*) inst
->prev
;
55 scan_inst
!= block
->start
->prev
;
56 scan_inst
= (fs_inst
*) scan_inst
->prev
) {
59 if (scan_inst
->dst
.file
== GRF
&&
60 scan_inst
->dst
.reg
== inst
->src
[0].reg
&&
61 scan_inst
->dst
.reg_offset
== inst
->src
[0].reg_offset
) {
62 if (scan_inst
->can_do_saturate()) {
63 scan_inst
->saturate
= true;
64 inst
->saturate
= false;
69 for (int i
= 0; i
< 3; i
++) {
70 if (scan_inst
->src
[i
].file
== GRF
&&
71 scan_inst
->src
[i
].reg
== inst
->src
[0].reg
&&
72 scan_inst
->src
[i
].reg_offset
== inst
->src
[0].reg_offset
) {
87 fs_visitor::opt_saturate_propagation()
89 bool progress
= false;
91 calculate_live_intervals();
93 cfg_t
cfg(&instructions
);
95 for (int b
= 0; b
< cfg
.num_blocks
; b
++) {
96 progress
= opt_saturate_propagation_local(this, cfg
.blocks
[b
])
101 invalidate_live_intervals();