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/*
* Copyright 2011 Tom Stellard <tstellar@gmail.com>
*
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "radeon_compiler.h"
#include "radeon_compiler_util.h"
#include "radeon_opcodes.h"
#include "radeon_program_pair.h"
static void mark_used_presub(struct rc_pair_sub_instruction * sub)
{
if (sub->Src[RC_PAIR_PRESUB_SRC].Used) {
unsigned int presub_reg_count = rc_presubtract_src_reg_count(
sub->Src[RC_PAIR_PRESUB_SRC].Index);
unsigned int i;
for (i = 0; i < presub_reg_count; i++) {
sub->Src[i].Used = 1;
}
}
}
static void mark_used(
struct rc_instruction * inst,
struct rc_pair_sub_instruction * sub)
{
unsigned int i;
const struct rc_opcode_info * info = rc_get_opcode_info(sub->Opcode);
for (i = 0; i < info->NumSrcRegs; i++) {
unsigned int src_type = rc_source_type_swz(sub->Arg[i].Swizzle);
if (src_type & RC_SOURCE_RGB) {
inst->U.P.RGB.Src[sub->Arg[i].Source].Used = 1;
}
if (src_type & RC_SOURCE_ALPHA) {
inst->U.P.Alpha.Src[sub->Arg[i].Source].Used = 1;
}
}
}
/**
* This pass finds sources that are not used by their instruction and marks
* them as unused.
*/
void rc_pair_remove_dead_sources(struct radeon_compiler * c, void *user)
{
struct rc_instruction * inst;
for (inst = c->Program.Instructions.Next;
inst != &c->Program.Instructions;
inst = inst->Next) {
unsigned int i;
if (inst->Type == RC_INSTRUCTION_NORMAL)
continue;
/* Mark all sources as unused */
for (i = 0; i < 4; i++) {
inst->U.P.RGB.Src[i].Used = 0;
inst->U.P.Alpha.Src[i].Used = 0;
}
mark_used(inst, &inst->U.P.RGB);
mark_used(inst, &inst->U.P.Alpha);
mark_used_presub(&inst->U.P.RGB);
mark_used_presub(&inst->U.P.Alpha);
}
}
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