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/*
* Copyright (C) 2008 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.h"
#include <stdio.h>
#include "radeon_compiler.h"
#include "radeon_dataflow.h"
/**
* Transform the given clause in the following way:
* 1. Replace it with an empty clause
* 2. For every instruction in the original clause, try the given
* transformations in order.
* 3. If one of the transformations returns GL_TRUE, assume that it
* has emitted the appropriate instruction(s) into the new clause;
* otherwise, copy the instruction verbatim.
*
* \note The transformation is currently not recursive; in other words,
* instructions emitted by transformations are not transformed.
*
* \note The transform is called 'local' because it can only look at
* one instruction at a time.
*/
void rc_local_transform(
struct radeon_compiler * c,
void *user)
{
struct radeon_program_transformation *transformations =
(struct radeon_program_transformation*)user;
struct rc_instruction * inst = c->Program.Instructions.Next;
while(inst != &c->Program.Instructions) {
struct rc_instruction * current = inst;
int i;
inst = inst->Next;
for(i = 0; transformations[i].function; ++i) {
struct radeon_program_transformation* t = transformations + i;
if (t->function(c, current, t->userData))
break;
}
}
}
struct get_used_temporaries_data {
unsigned char * Used;
unsigned int UsedLength;
};
static void get_used_temporaries_cb(
void * userdata,
struct rc_instruction * inst,
rc_register_file file,
unsigned int index,
unsigned int mask)
{
struct get_used_temporaries_data * d = userdata;
if (file != RC_FILE_TEMPORARY)
return;
if (index >= d->UsedLength)
return;
d->Used[index] |= mask;
}
/**
* This function fills in the parameter 'used' with a writemask that
* represent which components of each temporary register are used by the
* program. This is meant to be combined with rc_find_free_temporary_list as a
* more efficient version of rc_find_free_temporary.
* @param used The function does not initialize this parameter.
*/
void rc_get_used_temporaries(
struct radeon_compiler * c,
unsigned char * used,
unsigned int used_length)
{
struct rc_instruction * inst;
struct get_used_temporaries_data d;
d.Used = used;
d.UsedLength = used_length;
for(inst = c->Program.Instructions.Next;
inst != &c->Program.Instructions; inst = inst->Next) {
rc_for_all_reads_mask(inst, get_used_temporaries_cb, &d);
rc_for_all_writes_mask(inst, get_used_temporaries_cb, &d);
}
}
/* Search a list of used temporaries for a free one
* \sa rc_get_used_temporaries
* @note If this functions finds a free temporary, it will mark it as used
* in the used temporary list (param 'used')
* @param used list of used temporaries
* @param used_length number of items in param 'used'
* @param mask which components must be free in the temporary index that is
* returned.
* @return -1 If there are no more free temporaries, otherwise the index of
* a temporary register where the components specified in param 'mask' are
* not being used.
*/
int rc_find_free_temporary_list(
struct radeon_compiler * c,
unsigned char * used,
unsigned int used_length,
unsigned int mask)
{
int i;
for(i = 0; i < used_length; i++) {
if ((~used[i] & mask) == mask) {
used[i] |= mask;
return i;
}
}
return -1;
}
unsigned int rc_find_free_temporary(struct radeon_compiler * c)
{
unsigned char used[RC_REGISTER_MAX_INDEX];
int free;
memset(used, 0, sizeof(used));
rc_get_used_temporaries(c, used, RC_REGISTER_MAX_INDEX);
free = rc_find_free_temporary_list(c, used, RC_REGISTER_MAX_INDEX,
RC_MASK_XYZW);
if (free < 0) {
rc_error(c, "Ran out of temporary registers\n");
return 0;
}
return free;
}
struct rc_instruction *rc_alloc_instruction(struct radeon_compiler * c)
{
struct rc_instruction * inst = memory_pool_malloc(&c->Pool, sizeof(struct rc_instruction));
memset(inst, 0, sizeof(struct rc_instruction));
inst->U.I.Opcode = RC_OPCODE_ILLEGAL_OPCODE;
inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
inst->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_XYZW;
inst->U.I.SrcReg[2].Swizzle = RC_SWIZZLE_XYZW;
return inst;
}
void rc_insert_instruction(struct rc_instruction * after, struct rc_instruction * inst)
{
inst->Prev = after;
inst->Next = after->Next;
inst->Prev->Next = inst;
inst->Next->Prev = inst;
}
struct rc_instruction *rc_insert_new_instruction(struct radeon_compiler * c, struct rc_instruction * after)
{
struct rc_instruction * inst = rc_alloc_instruction(c);
rc_insert_instruction(after, inst);
return inst;
}
void rc_remove_instruction(struct rc_instruction * inst)
{
inst->Prev->Next = inst->Next;
inst->Next->Prev = inst->Prev;
}
/**
* Return the number of instructions in the program.
*/
unsigned int rc_recompute_ips(struct radeon_compiler * c)
{
unsigned int ip = 0;
struct rc_instruction * inst;
for(inst = c->Program.Instructions.Next;
inst != &c->Program.Instructions;
inst = inst->Next) {
inst->IP = ip++;
}
c->Program.Instructions.IP = 0xcafedead;
return ip;
}
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