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/*
* Copyright (C) 2009 Nicolai Haehnle.
* 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.
*
*/
#include "radeon_dataflow.h"
#include "radeon_compiler.h"
#include "radeon_compiler_util.h"
#include "radeon_program.h"
struct read_write_mask_data {
void * UserData;
rc_read_write_mask_fn Cb;
};
static void reads_normal_callback(
void * userdata,
struct rc_instruction * fullinst,
struct rc_src_register * src)
{
struct read_write_mask_data * cb_data = userdata;
unsigned int refmask = 0;
unsigned int chan;
for(chan = 0; chan < 4; chan++) {
refmask |= 1 << GET_SWZ(src->Swizzle, chan);
}
refmask &= RC_MASK_XYZW;
if (refmask) {
cb_data->Cb(cb_data->UserData, fullinst, src->File,
src->Index, refmask);
}
if (refmask && src->RelAddr) {
cb_data->Cb(cb_data->UserData, fullinst, RC_FILE_ADDRESS, 0,
RC_MASK_X);
}
}
static void pair_get_src_refmasks(unsigned int * refmasks,
struct rc_pair_instruction * inst,
unsigned int swz, unsigned int src)
{
if (swz >= 4)
return;
if (swz == RC_SWIZZLE_X || swz == RC_SWIZZLE_Y || swz == RC_SWIZZLE_Z) {
if(src == RC_PAIR_PRESUB_SRC) {
unsigned int i;
int srcp_regs =
rc_presubtract_src_reg_count(
inst->RGB.Src[src].Index);
for(i = 0; i < srcp_regs; i++) {
refmasks[i] |= 1 << swz;
}
}
else {
refmasks[src] |= 1 << swz;
}
}
if (swz == RC_SWIZZLE_W) {
if (src == RC_PAIR_PRESUB_SRC) {
unsigned int i;
int srcp_regs = rc_presubtract_src_reg_count(
inst->Alpha.Src[src].Index);
for(i = 0; i < srcp_regs; i++) {
refmasks[i] |= 1 << swz;
}
}
else {
refmasks[src] |= 1 << swz;
}
}
}
static void reads_pair(struct rc_instruction * fullinst, rc_read_write_mask_fn cb, void * userdata)
{
struct rc_pair_instruction * inst = &fullinst->U.P;
unsigned int refmasks[3] = { 0, 0, 0 };
unsigned int arg;
for(arg = 0; arg < 3; ++arg) {
unsigned int chan;
for(chan = 0; chan < 3; ++chan) {
unsigned int swz_rgb =
GET_SWZ(inst->RGB.Arg[arg].Swizzle, chan);
unsigned int swz_alpha =
GET_SWZ(inst->Alpha.Arg[arg].Swizzle, chan);
pair_get_src_refmasks(refmasks, inst, swz_rgb,
inst->RGB.Arg[arg].Source);
pair_get_src_refmasks(refmasks, inst, swz_alpha,
inst->Alpha.Arg[arg].Source);
}
}
for(unsigned int src = 0; src < 3; ++src) {
if (inst->RGB.Src[src].Used && (refmasks[src] & RC_MASK_XYZ))
cb(userdata, fullinst, inst->RGB.Src[src].File, inst->RGB.Src[src].Index,
refmasks[src] & RC_MASK_XYZ);
if (inst->Alpha.Src[src].Used && (refmasks[src] & RC_MASK_W))
cb(userdata, fullinst, inst->Alpha.Src[src].File, inst->Alpha.Src[src].Index, RC_MASK_W);
}
}
static void pair_sub_for_all_args(
struct rc_instruction * fullinst,
struct rc_pair_sub_instruction * sub,
rc_pair_read_arg_fn cb,
void * userdata)
{
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;
unsigned int channels = 0;
if (&fullinst->U.P.RGB == sub)
channels = 3;
else if (&fullinst->U.P.Alpha == sub)
channels = 1;
assert(channels > 0);
src_type = rc_source_type_swz(sub->Arg[i].Swizzle, channels);
if (src_type == RC_SOURCE_NONE)
continue;
if (sub->Arg[i].Source == RC_PAIR_PRESUB_SRC) {
unsigned int presub_type;
unsigned int presub_src_count;
struct rc_pair_instruction_source * src_array;
unsigned int j;
if (src_type & RC_SOURCE_RGB) {
presub_type = fullinst->
U.P.RGB.Src[RC_PAIR_PRESUB_SRC].Index;
src_array = fullinst->U.P.RGB.Src;
} else {
presub_type = fullinst->
U.P.Alpha.Src[RC_PAIR_PRESUB_SRC].Index;
src_array = fullinst->U.P.Alpha.Src;
}
presub_src_count
= rc_presubtract_src_reg_count(presub_type);
for(j = 0; j < presub_src_count; j++) {
cb(userdata, fullinst, &sub->Arg[i],
&src_array[j]);
}
} else {
struct rc_pair_instruction_source * src =
rc_pair_get_src(&fullinst->U.P, &sub->Arg[i]);
if (src) {
cb(userdata, fullinst, &sub->Arg[i], src);
}
}
}
}
/* This function calls the callback function (cb) for each source used by
* the instruction.
* */
void rc_for_all_reads_src(
struct rc_instruction * inst,
rc_read_src_fn cb,
void * userdata)
{
const struct rc_opcode_info * opcode =
rc_get_opcode_info(inst->U.I.Opcode);
/* This function only works with normal instructions. */
if (inst->Type != RC_INSTRUCTION_NORMAL) {
assert(0);
return;
}
for(unsigned int src = 0; src < opcode->NumSrcRegs; ++src) {
if (inst->U.I.SrcReg[src].File == RC_FILE_NONE)
continue;
if (inst->U.I.SrcReg[src].File == RC_FILE_PRESUB) {
unsigned int i;
unsigned int srcp_regs = rc_presubtract_src_reg_count(
inst->U.I.PreSub.Opcode);
for( i = 0; i < srcp_regs; i++) {
cb(userdata, inst, &inst->U.I.PreSub.SrcReg[i]);
}
} else {
cb(userdata, inst, &inst->U.I.SrcReg[src]);
}
}
}
/**
* This function calls the callback function (cb) for each arg of the RGB and
* alpha components.
*/
void rc_pair_for_all_reads_arg(
struct rc_instruction * inst,
rc_pair_read_arg_fn cb,
void * userdata)
{
/* This function only works with pair instructions. */
if (inst->Type != RC_INSTRUCTION_PAIR) {
assert(0);
return;
}
pair_sub_for_all_args(inst, &inst->U.P.RGB, cb, userdata);
pair_sub_for_all_args(inst, &inst->U.P.Alpha, cb, userdata);
}
/**
* Calls a callback function for all register reads.
*
* This is conservative, i.e. if the same register is referenced multiple times,
* the callback may also be called multiple times.
* Also, the writemask of the instruction is not taken into account.
*/
void rc_for_all_reads_mask(struct rc_instruction * inst, rc_read_write_mask_fn cb, void * userdata)
{
if (inst->Type == RC_INSTRUCTION_NORMAL) {
struct read_write_mask_data cb_data;
cb_data.UserData = userdata;
cb_data.Cb = cb;
rc_for_all_reads_src(inst, reads_normal_callback, &cb_data);
} else {
reads_pair(inst, cb, userdata);
}
}
static void writes_normal(struct rc_instruction * fullinst, rc_read_write_mask_fn cb, void * userdata)
{
struct rc_sub_instruction * inst = &fullinst->U.I;
const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->Opcode);
if (opcode->HasDstReg && inst->DstReg.WriteMask)
cb(userdata, fullinst, inst->DstReg.File, inst->DstReg.Index, inst->DstReg.WriteMask);
if (inst->WriteALUResult)
cb(userdata, fullinst, RC_FILE_SPECIAL, RC_SPECIAL_ALU_RESULT, RC_MASK_X);
}
static void writes_pair(struct rc_instruction * fullinst, rc_read_write_mask_fn cb, void * userdata)
{
struct rc_pair_instruction * inst = &fullinst->U.P;
if (inst->RGB.WriteMask)
cb(userdata, fullinst, RC_FILE_TEMPORARY, inst->RGB.DestIndex, inst->RGB.WriteMask);
if (inst->Alpha.WriteMask)
cb(userdata, fullinst, RC_FILE_TEMPORARY, inst->Alpha.DestIndex, RC_MASK_W);
if (inst->WriteALUResult)
cb(userdata, fullinst, RC_FILE_SPECIAL, RC_SPECIAL_ALU_RESULT, RC_MASK_X);
}
/**
* Calls a callback function for all register writes in the instruction,
* reporting writemasks to the callback function.
*
* \warning Does not report output registers for paired instructions!
*/
void rc_for_all_writes_mask(struct rc_instruction * inst, rc_read_write_mask_fn cb, void * userdata)
{
if (inst->Type == RC_INSTRUCTION_NORMAL) {
writes_normal(inst, cb, userdata);
} else {
writes_pair(inst, cb, userdata);
}
}
struct mask_to_chan_data {
void * UserData;
rc_read_write_chan_fn Fn;
};
static void mask_to_chan_cb(void * data, struct rc_instruction * inst,
rc_register_file file, unsigned int index, unsigned int mask)
{
struct mask_to_chan_data * d = data;
for(unsigned int chan = 0; chan < 4; ++chan) {
if (GET_BIT(mask, chan))
d->Fn(d->UserData, inst, file, index, chan);
}
}
/**
* Calls a callback function for all sourced register channels.
*
* This is conservative, i.e. channels may be called multiple times,
* and the writemask of the instruction is not taken into account.
*/
void rc_for_all_reads_chan(struct rc_instruction * inst, rc_read_write_chan_fn cb, void * userdata)
{
struct mask_to_chan_data d;
d.UserData = userdata;
d.Fn = cb;
rc_for_all_reads_mask(inst, &mask_to_chan_cb, &d);
}
/**
* Calls a callback function for all written register channels.
*
* \warning Does not report output registers for paired instructions!
*/
void rc_for_all_writes_chan(struct rc_instruction * inst, rc_read_write_chan_fn cb, void * userdata)
{
struct mask_to_chan_data d;
d.UserData = userdata;
d.Fn = cb;
rc_for_all_writes_mask(inst, &mask_to_chan_cb, &d);
}
static void remap_normal_instruction(struct rc_instruction * fullinst,
rc_remap_register_fn cb, void * userdata)
{
struct rc_sub_instruction * inst = &fullinst->U.I;
const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->Opcode);
if (opcode->HasDstReg) {
rc_register_file file = inst->DstReg.File;
unsigned int index = inst->DstReg.Index;
cb(userdata, fullinst, &file, &index);
inst->DstReg.File = file;
inst->DstReg.Index = index;
}
for(unsigned int src = 0; src < opcode->NumSrcRegs; ++src) {
rc_register_file file = inst->SrcReg[src].File;
unsigned int index = inst->SrcReg[src].Index;
if (file == RC_FILE_PRESUB) {
unsigned int i;
unsigned int srcp_srcs = rc_presubtract_src_reg_count(
inst->PreSub.Opcode);
for(i = 0; i < srcp_srcs; i++) {
file = inst->PreSub.SrcReg[i].File;
index = inst->PreSub.SrcReg[i].Index;
cb(userdata, fullinst, &file, &index);
inst->PreSub.SrcReg[i].File = file;
inst->PreSub.SrcReg[i].Index = index;
}
}
else {
cb(userdata, fullinst, &file, &index);
inst->SrcReg[src].File = file;
inst->SrcReg[src].Index = index;
}
}
}
static void remap_pair_instruction(struct rc_instruction * fullinst,
rc_remap_register_fn cb, void * userdata)
{
struct rc_pair_instruction * inst = &fullinst->U.P;
if (inst->RGB.WriteMask) {
rc_register_file file = RC_FILE_TEMPORARY;
unsigned int index = inst->RGB.DestIndex;
cb(userdata, fullinst, &file, &index);
inst->RGB.DestIndex = index;
}
if (inst->Alpha.WriteMask) {
rc_register_file file = RC_FILE_TEMPORARY;
unsigned int index = inst->Alpha.DestIndex;
cb(userdata, fullinst, &file, &index);
inst->Alpha.DestIndex = index;
}
for(unsigned int src = 0; src < 3; ++src) {
if (inst->RGB.Src[src].Used) {
rc_register_file file = inst->RGB.Src[src].File;
unsigned int index = inst->RGB.Src[src].Index;
cb(userdata, fullinst, &file, &index);
inst->RGB.Src[src].File = file;
inst->RGB.Src[src].Index = index;
}
if (inst->Alpha.Src[src].Used) {
rc_register_file file = inst->Alpha.Src[src].File;
unsigned int index = inst->Alpha.Src[src].Index;
cb(userdata, fullinst, &file, &index);
inst->Alpha.Src[src].File = file;
inst->Alpha.Src[src].Index = index;
}
}
}
/**
* Remap all register accesses according to the given function.
* That is, call the function \p cb for each referenced register (both read and written)
* and update the given instruction \p inst accordingly
* if it modifies its \ref pfile and \ref pindex contents.
*/
void rc_remap_registers(struct rc_instruction * inst, rc_remap_register_fn cb, void * userdata)
{
if (inst->Type == RC_INSTRUCTION_NORMAL)
remap_normal_instruction(inst, cb, userdata);
else
remap_pair_instruction(inst, cb, userdata);
}
/**
* @return RC_OPCODE_NOOP if inst is not a flow control instruction.
* @return The opcode of inst if it is a flow control instruction.
*/
static rc_opcode get_flow_control_inst(struct rc_instruction * inst)
{
const struct rc_opcode_info * info;
if (inst->Type == RC_INSTRUCTION_NORMAL) {
info = rc_get_opcode_info(inst->U.I.Opcode);
} else {
info = rc_get_opcode_info(inst->U.P.RGB.Opcode);
/*A flow control instruction shouldn't have an alpha
* instruction.*/
assert(!info->IsFlowControl ||
inst->U.P.Alpha.Opcode == RC_OPCODE_NOP);
}
if (info->IsFlowControl)
return info->Opcode;
else
return RC_OPCODE_NOP;
}
struct branch_write_mask {
unsigned int IfWriteMask:4;
unsigned int ElseWriteMask:4;
unsigned int HasElse:1;
};
union get_readers_read_cb {
rc_read_src_fn I;
rc_pair_read_arg_fn P;
};
struct get_readers_callback_data {
struct radeon_compiler * C;
struct rc_reader_data * ReaderData;
rc_read_src_fn ReadNormalCB;
rc_pair_read_arg_fn ReadPairCB;
rc_read_write_mask_fn WriteCB;
rc_register_file DstFile;
unsigned int DstIndex;
unsigned int DstMask;
unsigned int AliveWriteMask;
/* For convenience, this is indexed starting at 1 */
struct branch_write_mask BranchMasks[R500_PFS_MAX_BRANCH_DEPTH_FULL + 1];
};
static void add_reader(
struct memory_pool * pool,
struct rc_reader_data * data,
struct rc_instruction * inst,
unsigned int mask,
void * arg_or_src)
{
struct rc_reader * new;
memory_pool_array_reserve(pool, struct rc_reader, data->Readers,
data->ReaderCount, data->ReadersReserved, 1);
new = &data->Readers[data->ReaderCount++];
new->Inst = inst;
new->WriteMask = mask;
if (inst->Type == RC_INSTRUCTION_NORMAL) {
new->U.Src = arg_or_src;
} else {
new->U.Arg = arg_or_src;
}
}
static unsigned int get_readers_read_callback(
struct get_readers_callback_data * cb_data,
unsigned int has_rel_addr,
rc_register_file file,
unsigned int index,
unsigned int swizzle)
{
unsigned int shared_mask, read_mask;
if (has_rel_addr) {
cb_data->ReaderData->Abort = 1;
return RC_MASK_NONE;
}
shared_mask = rc_src_reads_dst_mask(file, index, swizzle,
cb_data->DstFile, cb_data->DstIndex, cb_data->AliveWriteMask);
if (shared_mask == RC_MASK_NONE)
return shared_mask;
/* If we make it this far, it means that this source reads from the
* same register written to by d->ReaderData->Writer. */
read_mask = rc_swizzle_to_writemask(swizzle);
if (cb_data->ReaderData->AbortOnRead & read_mask) {
cb_data->ReaderData->Abort = 1;
return shared_mask;
}
/* XXX The behavior in this case should be configurable. */
if ((read_mask & cb_data->AliveWriteMask) != read_mask) {
cb_data->ReaderData->Abort = 1;
return shared_mask;
}
return shared_mask;
}
static void get_readers_pair_read_callback(
void * userdata,
struct rc_instruction * inst,
struct rc_pair_instruction_arg * arg,
struct rc_pair_instruction_source * src)
{
unsigned int shared_mask;
struct get_readers_callback_data * d = userdata;
shared_mask = get_readers_read_callback(d,
0 /*Pair Instructions don't use RelAddr*/,
src->File, src->Index, arg->Swizzle);
if (shared_mask == RC_MASK_NONE)
return;
if (d->ReadPairCB)
d->ReadPairCB(d->ReaderData, inst, arg, src);
if (d->ReaderData->Abort)
return;
add_reader(&d->C->Pool, d->ReaderData, inst, shared_mask, arg);
}
/**
* This function is used by rc_get_readers_normal() to determine whether inst
* is a reader of userdata->ReaderData->Writer
*/
static void get_readers_normal_read_callback(
void * userdata,
struct rc_instruction * inst,
struct rc_src_register * src)
{
struct get_readers_callback_data * d = userdata;
unsigned int shared_mask;
shared_mask = get_readers_read_callback(d,
src->RelAddr, src->File, src->Index, src->Swizzle);
if (shared_mask == RC_MASK_NONE)
return;
/* The callback function could potentially clear d->ReaderData->Abort,
* so we need to call it before we return. */
if (d->ReadNormalCB)
d->ReadNormalCB(d->ReaderData, inst, src);
if (d->ReaderData->Abort)
return;
add_reader(&d->C->Pool, d->ReaderData, inst, shared_mask, src);
}
/**
* This function is used by rc_get_readers_normal() to determine when
* userdata->ReaderData->Writer is dead (i. e. All compontents of its
* destination register have been overwritten by other instructions).
*/
static void get_readers_write_callback(
void *userdata,
struct rc_instruction * inst,
rc_register_file file,
unsigned int index,
unsigned int mask)
{
struct get_readers_callback_data * d = userdata;
if (index == d->DstIndex && file == d->DstFile) {
unsigned int shared_mask = mask & d->DstMask;
d->ReaderData->AbortOnRead &= ~shared_mask;
d->AliveWriteMask &= ~shared_mask;
}
if(d->WriteCB)
d->WriteCB(d->ReaderData, inst, file, index, mask);
}
static void get_readers_for_single_write(
void * userdata,
struct rc_instruction * writer,
rc_register_file dst_file,
unsigned int dst_index,
unsigned int dst_mask)
{
struct rc_instruction * tmp;
unsigned int branch_depth = 0;
struct get_readers_callback_data * d = userdata;
d->ReaderData->Writer = writer;
d->ReaderData->AbortOnRead = 0;
d->ReaderData->InElse = 0;
d->DstFile = dst_file;
d->DstIndex = dst_index;
d->DstMask = dst_mask;
d->AliveWriteMask = dst_mask;
memset(d->BranchMasks, 0, sizeof(d->BranchMasks));
if (!dst_mask)
return;
for(tmp = writer->Next; tmp != &d->C->Program.Instructions;
tmp = tmp->Next){
rc_opcode opcode = get_flow_control_inst(tmp);
switch(opcode) {
case RC_OPCODE_BGNLOOP:
/* XXX We can do better when we see a BGNLOOP if we
* add a flag called AbortOnWrite to struct
* rc_reader_data and leave it set until the next
* ENDLOOP. */
case RC_OPCODE_ENDLOOP:
/* XXX We can do better when we see an ENDLOOP by
* searching backwards from writer and looking for
* readers of writer's destination index. If we find a
* reader before we get to the BGNLOOP, we must abort
* unless there is another writer between that reader
* and the BGNLOOP. */
case RC_OPCODE_BRK:
case RC_OPCODE_CONT:
d->ReaderData->Abort = 1;
return;
case RC_OPCODE_IF:
branch_depth++;
if (branch_depth > R500_PFS_MAX_BRANCH_DEPTH_FULL) {
d->ReaderData->Abort = 1;
return;
}
d->BranchMasks[branch_depth].IfWriteMask =
d->AliveWriteMask;
break;
case RC_OPCODE_ELSE:
if (branch_depth == 0) {
d->ReaderData->InElse = 1;
} else {
unsigned int temp_mask = d->AliveWriteMask;
d->AliveWriteMask =
d->BranchMasks[branch_depth].IfWriteMask;
d->BranchMasks[branch_depth].ElseWriteMask =
temp_mask;
d->BranchMasks[branch_depth].HasElse = 1;
}
break;
case RC_OPCODE_ENDIF:
if (branch_depth == 0) {
d->ReaderData->AbortOnRead = d->AliveWriteMask;
d->ReaderData->InElse = 0;
}
else {
struct branch_write_mask * masks =
&d->BranchMasks[branch_depth];
if (masks->HasElse) {
d->ReaderData->AbortOnRead |=
masks->IfWriteMask
& ~masks->ElseWriteMask;
d->AliveWriteMask = masks->IfWriteMask
^ ((masks->IfWriteMask ^
masks->ElseWriteMask)
& (masks->IfWriteMask
^ d->AliveWriteMask));
} else {
d->ReaderData->AbortOnRead |=
masks->IfWriteMask
& ~d->AliveWriteMask;
d->AliveWriteMask = masks->IfWriteMask;
}
memset(masks, 0,
sizeof(struct branch_write_mask));
branch_depth--;
}
break;
default:
break;
}
if (d->ReaderData->InElse)
continue;
if (tmp->Type == RC_INSTRUCTION_NORMAL) {
rc_for_all_reads_src(tmp,
get_readers_normal_read_callback, d);
} else {
rc_pair_for_all_reads_arg(tmp,
get_readers_pair_read_callback, d);
}
rc_for_all_writes_mask(tmp, get_readers_write_callback, d);
if (d->ReaderData->Abort)
return;
if (branch_depth == 0 && !d->AliveWriteMask)
return;
}
}
/**
* This function will create a list of readers via the rc_reader_data struct.
* This function will abort (set the flag data->Abort) and return if it
* encounters an instruction that reads from @param writer and also a different
* instruction. Here are some examples:
*
* writer = instruction 0;
* 0 MOV TEMP[0].xy, TEMP[1].xy
* 1 MOV TEMP[0].zw, TEMP[2].xy
* 2 MOV TEMP[3], TEMP[0]
* The Abort flag will be set on instruction 2, because it reads values written
* by instructions 0 and 1.
*
* writer = instruction 1;
* 0 IF TEMP[0].x
* 1 MOV TEMP[1], TEMP[2]
* 2 ELSE
* 3 MOV TEMP[1], TEMP[2]
* 4 ENDIF
* 5 MOV TEMP[3], TEMP[1]
* The Abort flag will be set on instruction 5, because it could read from the
* value written by either instruction 1 or 3, depending on the jump decision
* made at instruction 0.
*
* writer = instruction 0;
* 0 MOV TEMP[0], TEMP[1]
* 2 BGNLOOP
* 3 ADD TEMP[0], TEMP[0], none.1
* 4 ENDLOOP
* The Abort flag will be set on instruction 3, because in the first iteration
* of the loop it reads the value written by instruction 0 and in all other
* iterations it reads the value written by instruction 3.
*
* @param read_cb This function will be called for for every instruction that
* has been determined to be a reader of writer.
* @param write_cb This function will be called for every instruction after
* writer.
*/
void rc_get_readers(
struct radeon_compiler * c,
struct rc_instruction * writer,
struct rc_reader_data * data,
rc_read_src_fn read_normal_cb,
rc_pair_read_arg_fn read_pair_cb,
rc_read_write_mask_fn write_cb)
{
struct get_readers_callback_data d;
data->Abort = 0;
data->ReaderCount = 0;
data->ReadersReserved = 0;
data->Readers = NULL;
d.C = c;
d.ReaderData = data;
d.ReadNormalCB = read_normal_cb;
d.ReadPairCB = read_pair_cb;
d.WriteCB = write_cb;
rc_for_all_writes_mask(writer, get_readers_for_single_write, &d);
}
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