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/*
* Copyright (C) 2008-2009 Nicolai Haehnle.
*
* 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_program_pair.h"
#include "radeon_compiler_util.h"
#include <stdlib.h>
/**
* Return the source slot where we installed the given register access,
* or -1 if no slot was free anymore.
*/
int rc_pair_alloc_source(struct rc_pair_instruction *pair,
unsigned int rgb, unsigned int alpha,
rc_register_file file, unsigned int index)
{
int candidate = -1;
int candidate_quality = -1;
unsigned int alpha_used = 0;
unsigned int rgb_used = 0;
int i;
if ((!rgb && !alpha) || file == RC_FILE_NONE)
return 0;
/* Make sure only one presubtract operation is used per instruction. */
if (file == RC_FILE_PRESUB) {
if (rgb && pair->RGB.Src[RC_PAIR_PRESUB_SRC].Used
&& index != pair->RGB.Src[RC_PAIR_PRESUB_SRC].Index) {
return -1;
}
if (alpha && pair->Alpha.Src[RC_PAIR_PRESUB_SRC].Used
&& index != pair->Alpha.Src[RC_PAIR_PRESUB_SRC].Index) {
return -1;
}
}
for(i = 0; i < 3; ++i) {
int q = 0;
if (rgb) {
if (pair->RGB.Src[i].Used) {
if (pair->RGB.Src[i].File != file ||
pair->RGB.Src[i].Index != index) {
rgb_used++;
continue;
}
q++;
}
}
if (alpha) {
if (pair->Alpha.Src[i].Used) {
if (pair->Alpha.Src[i].File != file ||
pair->Alpha.Src[i].Index != index) {
alpha_used++;
continue;
}
q++;
}
}
if (q > candidate_quality) {
candidate_quality = q;
candidate = i;
}
}
if (file == RC_FILE_PRESUB) {
candidate = RC_PAIR_PRESUB_SRC;
} else if (candidate < 0 || (rgb && rgb_used > 2)
|| (alpha && alpha_used > 2)) {
return -1;
}
/* candidate >= 0 */
if (rgb) {
pair->RGB.Src[candidate].Used = 1;
pair->RGB.Src[candidate].File = file;
pair->RGB.Src[candidate].Index = index;
if (candidate == RC_PAIR_PRESUB_SRC) {
/* For registers with the RC_FILE_PRESUB file,
* the index stores the presubtract op. */
int src_regs = rc_presubtract_src_reg_count(index);
for(i = 0; i < src_regs; i++) {
pair->RGB.Src[i].Used = 1;
}
}
}
if (alpha) {
pair->Alpha.Src[candidate].Used = 1;
pair->Alpha.Src[candidate].File = file;
pair->Alpha.Src[candidate].Index = index;
if (candidate == RC_PAIR_PRESUB_SRC) {
/* For registers with the RC_FILE_PRESUB file,
* the index stores the presubtract op. */
int src_regs = rc_presubtract_src_reg_count(index);
for(i=0; i < src_regs; i++) {
pair->Alpha.Src[i].Used = 1;
}
}
}
return candidate;
}
static void pair_foreach_source_callback(
struct rc_pair_instruction * pair,
void * data,
rc_pair_foreach_src_fn cb,
unsigned int swz,
unsigned int src)
{
/* swz > 3 means that the swizzle is either not used, or a constant
* swizzle (e.g. 0, 1, 0.5). */
if(swz > 3)
return;
if(swz == RC_SWIZZLE_W) {
if (src == RC_PAIR_PRESUB_SRC) {
unsigned int i;
unsigned int src_count = rc_presubtract_src_reg_count(
pair->Alpha.Src[RC_PAIR_PRESUB_SRC].Index);
for(i = 0; i < src_count; i++) {
cb(data, &pair->Alpha.Src[i]);
}
} else {
cb(data, &pair->Alpha.Src[src]);
}
} else {
if (src == RC_PAIR_PRESUB_SRC) {
unsigned int i;
unsigned int src_count = rc_presubtract_src_reg_count(
pair->RGB.Src[RC_PAIR_PRESUB_SRC].Index);
for(i = 0; i < src_count; i++) {
cb(data, &pair->RGB.Src[i]);
}
}
else {
cb(data, &pair->RGB.Src[src]);
}
}
}
void rc_pair_foreach_source_that_alpha_reads(
struct rc_pair_instruction * pair,
void * data,
rc_pair_foreach_src_fn cb)
{
unsigned int i;
const struct rc_opcode_info * info =
rc_get_opcode_info(pair->Alpha.Opcode);
for(i = 0; i < info->NumSrcRegs; i++) {
pair_foreach_source_callback(pair, data, cb,
GET_SWZ(pair->Alpha.Arg[i].Swizzle, 0),
pair->Alpha.Arg[i].Source);
}
}
void rc_pair_foreach_source_that_rgb_reads(
struct rc_pair_instruction * pair,
void * data,
rc_pair_foreach_src_fn cb)
{
unsigned int i;
const struct rc_opcode_info * info =
rc_get_opcode_info(pair->RGB.Opcode);
for(i = 0; i < info->NumSrcRegs; i++) {
unsigned int chan;
unsigned int swz = RC_SWIZZLE_UNUSED;
/* Find a swizzle that is either X,Y,Z,or W. We assume here
* that if one channel swizzles X,Y, or Z, then none of the
* other channels swizzle W, and vice-versa. */
for(chan = 0; chan < 4; chan++) {
swz = GET_SWZ(pair->RGB.Arg[i].Swizzle, chan);
if(swz == RC_SWIZZLE_X || swz == RC_SWIZZLE_Y
|| swz == RC_SWIZZLE_Z || swz == RC_SWIZZLE_W)
continue;
}
pair_foreach_source_callback(pair, data, cb,
swz,
pair->RGB.Arg[i].Source);
}
}
struct rc_pair_instruction_source * rc_pair_get_src(
struct rc_pair_instruction * pair_inst,
struct rc_pair_instruction_arg * arg)
{
unsigned int type;
type = rc_source_type_swz(arg->Swizzle);
if (type & RC_SOURCE_RGB) {
return &pair_inst->RGB.Src[arg->Source];
} else if (type & RC_SOURCE_ALPHA) {
return &pair_inst->Alpha.Src[arg->Source];
} else {
return NULL;
}
}
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