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* Copyright (C) 2008-2009 Nicolai Haehnle.
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#include "radeon_program_pair.h"
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#include "radeon_compiler_util.h"
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* Return the source slot where we installed the given register access,
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* or -1 if no slot was free anymore.
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int rc_pair_alloc_source(struct rc_pair_instruction *pair,
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unsigned int rgb, unsigned int alpha,
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rc_register_file file, unsigned int index)
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int candidate_quality = -1;
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unsigned int alpha_used = 0;
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unsigned int rgb_used = 0;
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if ((!rgb && !alpha) || file == RC_FILE_NONE)
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/* Make sure only one presubtract operation is used per instruction. */
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if (file == RC_FILE_PRESUB) {
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if (rgb && pair->RGB.Src[RC_PAIR_PRESUB_SRC].Used
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&& index != pair->RGB.Src[RC_PAIR_PRESUB_SRC].Index) {
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if (alpha && pair->Alpha.Src[RC_PAIR_PRESUB_SRC].Used
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&& index != pair->Alpha.Src[RC_PAIR_PRESUB_SRC].Index) {
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for(i = 0; i < 3; ++i) {
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if (pair->RGB.Src[i].Used) {
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if (pair->RGB.Src[i].File != file ||
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pair->RGB.Src[i].Index != index) {
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if (pair->Alpha.Src[i].Used) {
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if (pair->Alpha.Src[i].File != file ||
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pair->Alpha.Src[i].Index != index) {
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if (q > candidate_quality) {
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candidate_quality = q;
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if (file == RC_FILE_PRESUB) {
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candidate = RC_PAIR_PRESUB_SRC;
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} else if (candidate < 0 || (rgb && rgb_used > 2)
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|| (alpha && alpha_used > 2)) {
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pair->RGB.Src[candidate].Used = 1;
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pair->RGB.Src[candidate].File = file;
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pair->RGB.Src[candidate].Index = index;
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if (candidate == RC_PAIR_PRESUB_SRC) {
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/* For registers with the RC_FILE_PRESUB file,
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* the index stores the presubtract op. */
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int src_regs = rc_presubtract_src_reg_count(index);
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for(i = 0; i < src_regs; i++) {
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pair->RGB.Src[i].Used = 1;
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pair->Alpha.Src[candidate].Used = 1;
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pair->Alpha.Src[candidate].File = file;
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pair->Alpha.Src[candidate].Index = index;
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if (candidate == RC_PAIR_PRESUB_SRC) {
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/* For registers with the RC_FILE_PRESUB file,
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* the index stores the presubtract op. */
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int src_regs = rc_presubtract_src_reg_count(index);
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for(i=0; i < src_regs; i++) {
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pair->Alpha.Src[i].Used = 1;
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static void pair_foreach_source_callback(
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struct rc_pair_instruction * pair,
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rc_pair_foreach_src_fn cb,
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/* swz > 3 means that the swizzle is either not used, or a constant
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* swizzle (e.g. 0, 1, 0.5). */
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if(swz == RC_SWIZZLE_W) {
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if (src == RC_PAIR_PRESUB_SRC) {
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unsigned int src_count = rc_presubtract_src_reg_count(
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pair->Alpha.Src[RC_PAIR_PRESUB_SRC].Index);
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for(i = 0; i < src_count; i++) {
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cb(data, &pair->Alpha.Src[i]);
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cb(data, &pair->Alpha.Src[src]);
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if (src == RC_PAIR_PRESUB_SRC) {
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unsigned int src_count = rc_presubtract_src_reg_count(
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pair->RGB.Src[RC_PAIR_PRESUB_SRC].Index);
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for(i = 0; i < src_count; i++) {
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cb(data, &pair->RGB.Src[i]);
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cb(data, &pair->RGB.Src[src]);
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void rc_pair_foreach_source_that_alpha_reads(
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struct rc_pair_instruction * pair,
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rc_pair_foreach_src_fn cb)
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const struct rc_opcode_info * info =
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rc_get_opcode_info(pair->Alpha.Opcode);
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for(i = 0; i < info->NumSrcRegs; i++) {
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pair_foreach_source_callback(pair, data, cb,
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GET_SWZ(pair->Alpha.Arg[i].Swizzle, 0),
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pair->Alpha.Arg[i].Source);
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void rc_pair_foreach_source_that_rgb_reads(
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struct rc_pair_instruction * pair,
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rc_pair_foreach_src_fn cb)
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const struct rc_opcode_info * info =
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rc_get_opcode_info(pair->RGB.Opcode);
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for(i = 0; i < info->NumSrcRegs; i++) {
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unsigned int swz = RC_SWIZZLE_UNUSED;
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/* Find a swizzle that is either X,Y,Z,or W. We assume here
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* that if one channel swizzles X,Y, or Z, then none of the
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* other channels swizzle W, and vice-versa. */
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for(chan = 0; chan < 4; chan++) {
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swz = GET_SWZ(pair->RGB.Arg[i].Swizzle, chan);
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if(swz == RC_SWIZZLE_X || swz == RC_SWIZZLE_Y
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|| swz == RC_SWIZZLE_Z || swz == RC_SWIZZLE_W)
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pair_foreach_source_callback(pair, data, cb,
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pair->RGB.Arg[i].Source);
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struct rc_pair_instruction_source * rc_pair_get_src(
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struct rc_pair_instruction * pair_inst,
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struct rc_pair_instruction_arg * arg)
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type = rc_source_type_swz(arg->Swizzle);
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if (type & RC_SOURCE_RGB) {
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return &pair_inst->RGB.Src[arg->Source];
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} else if (type & RC_SOURCE_ALPHA) {
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return &pair_inst->Alpha.Src[arg->Source];
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int rc_pair_get_src_index(
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struct rc_pair_instruction * pair_inst,
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struct rc_pair_instruction_source * src)
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for (i = 0; i < 3; i++) {
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if (&pair_inst->RGB.Src[i] == src
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|| &pair_inst->Alpha.Src[i] == src) {