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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_rename_regs.h"
#include "radeon_compiler.h"
#include "radeon_dataflow.h"
#include "radeon_program.h"
/**
* This function renames registers in an attempt to get the code close to
* SSA form. After this function has completed, most of the register are only
* written to one time, with a few exceptions.
*
* This function assumes all the instructions are still of type
* RC_INSTRUCTION_NORMAL.
*/
void rc_rename_regs(struct radeon_compiler *c, void *user)
{
unsigned int i, used_length;
int new_index;
struct rc_instruction * inst;
struct rc_reader_data reader_data;
unsigned char * used;
used_length = 2 * rc_recompute_ips(c);
used = memory_pool_malloc(&c->Pool, sizeof(unsigned char) * used_length);
memset(used, 0, sizeof(unsigned char) * used_length);
rc_get_used_temporaries(c, used, used_length);
for(inst = c->Program.Instructions.Next;
inst != &c->Program.Instructions;
inst = inst->Next) {
if (inst->U.I.DstReg.File != RC_FILE_TEMPORARY)
continue;
rc_get_readers(c, inst, &reader_data, NULL, NULL, NULL);
if (reader_data.Abort || reader_data.ReaderCount == 0)
continue;
new_index = rc_find_free_temporary_list(c, used, used_length,
RC_MASK_XYZW);
if (new_index < 0) {
rc_error(c, "Ran out of temporary registers\n");
return;
}
reader_data.Writer->U.I.DstReg.Index = new_index;
for(i = 0; i < reader_data.ReaderCount; i++) {
reader_data.Readers[i].U.Src->Index = new_index;
}
}
}
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