/*
|
* 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_list.h"
|
#include "radeon_program.h"
|
#include "radeon_variable.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 used_length;
|
struct rc_instruction * inst;
|
unsigned char * used;
|
struct rc_list * variables;
|
struct rc_list * var_ptr;
|
|
/* XXX Remove this once the register allocation works with flow control. */
|
for(inst = c->Program.Instructions.Next;
|
inst != &c->Program.Instructions;
|
inst = inst->Next) {
|
if (inst->U.I.Opcode == RC_OPCODE_BGNLOOP)
|
return;
|
}
|
|
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);
|
variables = rc_get_variables(c);
|
|
for (var_ptr = variables; var_ptr; var_ptr = var_ptr->Next) {
|
int new_index;
|
unsigned writemask;
|
struct rc_variable * var = var_ptr->Item;
|
|
if (var->Inst->U.I.DstReg.File != RC_FILE_TEMPORARY) {
|
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;
|
}
|
|
writemask = rc_variable_writemask_sum(var);
|
rc_variable_change_dst(var, new_index, writemask);
|
}
|
}
|
