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/*
* Copyright 2010 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.
*
*/
/**
* \file
*/
#include "radeon_compiler_util.h"
#include "radeon_compiler.h"
#include "radeon_dataflow.h"
/**
*/
unsigned int rc_swizzle_to_writemask(unsigned int swz)
{
unsigned int mask = 0;
unsigned int i;
for(i = 0; i < 4; i++) {
mask |= 1 << GET_SWZ(swz, i);
}
mask &= RC_MASK_XYZW;
return mask;
}
unsigned int rc_src_reads_dst_mask(
rc_register_file src_file,
unsigned int src_idx,
unsigned int src_swz,
rc_register_file dst_file,
unsigned int dst_idx,
unsigned int dst_mask)
{
if (src_file != dst_file || src_idx != dst_idx) {
return RC_MASK_NONE;
}
return dst_mask & rc_swizzle_to_writemask(src_swz);
}
unsigned int rc_source_type_swz(unsigned int swizzle, unsigned int channels)
{
unsigned int chan;
unsigned int swz = RC_SWIZZLE_UNUSED;
unsigned int ret = RC_SOURCE_NONE;
for(chan = 0; chan < channels; chan++) {
swz = GET_SWZ(swizzle, chan);
if (swz == RC_SWIZZLE_W) {
ret |= RC_SOURCE_ALPHA;
} else if (swz == RC_SWIZZLE_X || swz == RC_SWIZZLE_Y
|| swz == RC_SWIZZLE_Z) {
ret |= RC_SOURCE_RGB;
}
}
return ret;
}
unsigned int rc_source_type_mask(unsigned int mask)
{
unsigned int ret = RC_SOURCE_NONE;
if (mask & RC_MASK_XYZ)
ret |= RC_SOURCE_RGB;
if (mask & RC_MASK_W)
ret |= RC_SOURCE_ALPHA;
return ret;
}
struct can_use_presub_data {
struct rc_src_register RemoveSrcs[3];
unsigned int RGBCount;
unsigned int AlphaCount;
};
static void can_use_presub_read_cb(
void * userdata,
struct rc_instruction * inst,
rc_register_file file,
unsigned int index,
unsigned int mask)
{
struct can_use_presub_data * d = userdata;
unsigned int src_type = rc_source_type_mask(mask);
unsigned int i;
if (file == RC_FILE_NONE)
return;
for(i = 0; i < 3; i++) {
if (d->RemoveSrcs[i].File == file
&& d->RemoveSrcs[i].Index == index) {
src_type &=
~rc_source_type_swz(d->RemoveSrcs[i].Swizzle, 4);
}
}
if (src_type & RC_SOURCE_RGB)
d->RGBCount++;
if (src_type & RC_SOURCE_ALPHA)
d->AlphaCount++;
}
unsigned int rc_inst_can_use_presub(
struct rc_instruction * inst,
rc_presubtract_op presub_op,
unsigned int presub_writemask,
struct rc_src_register replace_reg,
struct rc_src_register presub_src0,
struct rc_src_register presub_src1)
{
struct can_use_presub_data d;
unsigned int num_presub_srcs;
unsigned int presub_src_type = rc_source_type_mask(presub_writemask);
const struct rc_opcode_info * info =
rc_get_opcode_info(inst->U.I.Opcode);
if (presub_op == RC_PRESUB_NONE) {
return 1;
}
if (info->HasTexture) {
return 0;
}
/* We can't use more than one presubtract value in an
* instruction, unless the two prsubtract operations
* are the same and read from the same registers.
* XXX For now we will limit instructions to only one presubtract
* value.*/
if (inst->U.I.PreSub.Opcode != RC_PRESUB_NONE) {
return 0;
}
memset(&d, 0, sizeof(d));
d.RemoveSrcs[0] = replace_reg;
d.RemoveSrcs[1] = presub_src0;
d.RemoveSrcs[2] = presub_src1;
rc_for_all_reads_mask(inst, can_use_presub_read_cb, &d);
num_presub_srcs = rc_presubtract_src_reg_count(presub_op);
if ((presub_src_type & RC_SOURCE_RGB)
&& d.RGBCount + num_presub_srcs > 3) {
return 0;
}
if ((presub_src_type & RC_SOURCE_ALPHA)
&& d.AlphaCount + num_presub_srcs > 3) {
return 0;
}
return 1;
}
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