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/*
* Copyright © 2011 Intel Corporation
*
* 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 AUTHORS OR COPYRIGHT HOLDERS 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 "brw_vec4.h"
#include "../glsl/ir_print_visitor.h"
using namespace brw;
namespace brw {
static void
assign(int *reg_hw_locations, reg *reg)
{
if (reg->file == GRF) {
reg->reg = reg_hw_locations[reg->reg];
}
}
void
vec4_visitor::reg_allocate_trivial()
{
int hw_reg_mapping[this->virtual_grf_count];
bool virtual_grf_used[this->virtual_grf_count];
int i;
int next;
/* Calculate which virtual GRFs are actually in use after whatever
* optimization passes have occurred.
*/
for (int i = 0; i < this->virtual_grf_count; i++) {
virtual_grf_used[i] = false;
}
foreach_iter(exec_list_iterator, iter, this->instructions) {
vec4_instruction *inst = (vec4_instruction *)iter.get();
if (inst->dst.file == GRF)
virtual_grf_used[inst->dst.reg] = true;
for (int i = 0; i < 3; i++) {
if (inst->src[i].file == GRF)
virtual_grf_used[inst->src[i].reg] = true;
}
}
/* Note that compressed instructions require alignment to 2 registers. */
hw_reg_mapping[0] = this->first_non_payload_grf;
next = hw_reg_mapping[0] + this->virtual_grf_sizes[0];
for (i = 1; i < this->virtual_grf_count; i++) {
if (virtual_grf_used[i]) {
hw_reg_mapping[i] = next;
next += this->virtual_grf_sizes[i];
}
}
prog_data->total_grf = next;
foreach_iter(exec_list_iterator, iter, this->instructions) {
vec4_instruction *inst = (vec4_instruction *)iter.get();
assign(hw_reg_mapping, &inst->dst);
assign(hw_reg_mapping, &inst->src[0]);
assign(hw_reg_mapping, &inst->src[1]);
assign(hw_reg_mapping, &inst->src[2]);
}
if (prog_data->total_grf > BRW_MAX_GRF) {
fail("Ran out of regs on trivial allocator (%d/%d)\n",
prog_data->total_grf, BRW_MAX_GRF);
}
}
void
vec4_visitor::reg_allocate()
{
reg_allocate_trivial();
}
} /* namespace brw */
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