1
2#include "radeon_compiler.h"
3#include "radeon_compiler_util.h"
4#include "radeon_opcodes.h"
5#include "radeon_program_pair.h"
6
7static void mark_used_presub(struct rc_pair_sub_instruction * sub)
8{
9	if (sub->Src[RC_PAIR_PRESUB_SRC].Used) {
10		unsigned int presub_reg_count = rc_presubtract_src_reg_count(
11					sub->Src[RC_PAIR_PRESUB_SRC].Index);
12		unsigned int i;
13		for (i = 0; i < presub_reg_count; i++) {
14			sub->Src[i].Used = 1;
15		}
16	}
17}
18
19static void mark_used(
20	struct rc_instruction * inst,
21	struct rc_pair_sub_instruction * sub)
22{
23	unsigned int i;
24	const struct rc_opcode_info * info = rc_get_opcode_info(sub->Opcode);
25	for (i = 0; i < info->NumSrcRegs; i++) {
26		unsigned int src_type = rc_source_type_swz(sub->Arg[i].Swizzle);
27		if (src_type & RC_SOURCE_RGB) {
28			inst->U.P.RGB.Src[sub->Arg[i].Source].Used = 1;
29		}
30
31		if (src_type & RC_SOURCE_ALPHA) {
32			inst->U.P.Alpha.Src[sub->Arg[i].Source].Used = 1;
33		}
34	}
35}
36
37/**
38 * This pass finds sources that are not used by their instruction and marks
39 * them as unused.
40 */
41void rc_pair_remove_dead_sources(struct radeon_compiler * c, void *user)
42{
43	struct rc_instruction * inst;
44	for (inst = c->Program.Instructions.Next;
45					inst != &c->Program.Instructions;
46					inst = inst->Next) {
47		unsigned int i;
48		if (inst->Type == RC_INSTRUCTION_NORMAL)
49			continue;
50
51		/* Mark all sources as unused */
52		for (i = 0; i < 4; i++) {
53			inst->U.P.RGB.Src[i].Used = 0;
54			inst->U.P.Alpha.Src[i].Used = 0;
55		}
56		mark_used(inst, &inst->U.P.RGB);
57		mark_used(inst, &inst->U.P.Alpha);
58
59		mark_used_presub(&inst->U.P.RGB);
60		mark_used_presub(&inst->U.P.Alpha);
61	}
62}
63