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* Copyright 2010 Tom Stellard <tstellar@gmail.com>
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#include "radeon_rename_regs.h"
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#include "radeon_compiler.h"
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#include "radeon_dataflow.h"
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#include "radeon_program.h"
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* This function renames registers in an attempt to get the code close to
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* SSA form. After this function has completed, most of the register are only
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* written to one time, with a few exceptions.
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* This function assumes all the instructions are still of type
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* RC_INSTRUCTION_NORMAL.
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void rc_rename_regs(struct radeon_compiler *c, void *user)
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unsigned int i, used_length;
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struct rc_instruction * inst;
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struct rc_reader_data reader_data;
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/* XXX Remove this once the register allocation works with flow control. */
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for(inst = c->Program.Instructions.Next;
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inst != &c->Program.Instructions;
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if (inst->U.I.Opcode == RC_OPCODE_BGNLOOP)
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used_length = 2 * rc_recompute_ips(c);
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used = memory_pool_malloc(&c->Pool, sizeof(unsigned char) * used_length);
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memset(used, 0, sizeof(unsigned char) * used_length);
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rc_get_used_temporaries(c, used, used_length);
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for(inst = c->Program.Instructions.Next;
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inst != &c->Program.Instructions;
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if (inst->U.I.DstReg.File != RC_FILE_TEMPORARY)
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reader_data.ExitOnAbort = 1;
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rc_get_readers(c, inst, &reader_data, NULL, NULL, NULL);
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if (reader_data.Abort || reader_data.ReaderCount == 0)
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new_index = rc_find_free_temporary_list(c, used, used_length,
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rc_error(c, "Ran out of temporary registers\n");
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reader_data.Writer->U.I.DstReg.Index = new_index;
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for(i = 0; i < reader_data.ReaderCount; i++) {
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reader_data.Readers[i].U.I.Src->Index = new_index;