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/*
* Copyright © 2015 Connor Abbott
*
* 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_fs.h"
#include "brw_cfg.h"
#include "brw_fs_builder.h"
using namespace brw;
bool
fs_visitor::lower_d2x()
{
bool progress = false;
foreach_block_and_inst_safe(block, fs_inst, inst, cfg) {
if (inst->opcode != BRW_OPCODE_MOV)
continue;
if (inst->dst.type != BRW_REGISTER_TYPE_F &&
inst->dst.type != BRW_REGISTER_TYPE_D &&
inst->dst.type != BRW_REGISTER_TYPE_UD)
continue;
if (inst->src[0].type != BRW_REGISTER_TYPE_DF)
continue;
assert(inst->dst.file == VGRF);
assert(inst->saturate == false);
fs_reg dst = inst->dst;
const fs_builder ibld(this, block, inst);
/* From the Broadwell PRM, 3D Media GPGPU, "Double Precision Float to
* Single Precision Float":
*
* The upper Dword of every Qword will be written with undefined
* value when converting DF to F.
*
* So we need to allocate a temporary that's two registers, and then do
* a strided MOV to get the lower DWord of every Qword that has the
* result.
*/
fs_reg temp = ibld.vgrf(inst->src[0].type, 1);
fs_reg strided_temp = subscript(temp, inst->dst.type, 0);
ibld.MOV(strided_temp, inst->src[0]);
ibld.MOV(dst, strided_temp);
inst->remove(block);
progress = true;
}
if (progress)
invalidate_live_intervals();
return progress;
}
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