af6fc3a8ea
v2: - Change the name to lower_conversions. Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> Reviewed-by: Francisco Jerez <currojerez@riseup.net>
108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
/*
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* Copyright © 2015 Connor Abbott
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "brw_fs.h"
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#include "brw_cfg.h"
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#include "brw_fs_builder.h"
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using namespace brw;
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static bool
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supports_type_conversion(const fs_inst *inst) {
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switch (inst->opcode) {
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case BRW_OPCODE_MOV:
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case SHADER_OPCODE_MOV_INDIRECT:
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return true;
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case BRW_OPCODE_SEL:
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return inst->dst.type == get_exec_type(inst);
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default:
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/* FIXME: We assume the opcodes don't explicitly mentioned
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* before just work fine with arbitrary conversions.
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*/
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return true;
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}
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}
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bool
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fs_visitor::lower_conversions()
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{
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bool progress = false;
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foreach_block_and_inst(block, fs_inst, inst, cfg) {
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const fs_builder ibld(this, block, inst);
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fs_reg dst = inst->dst;
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bool saturate = inst->saturate;
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if (supports_type_conversion(inst)) {
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if (get_exec_type_size(inst) == 8 && type_sz(inst->dst.type) < 8) {
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/* From the Broadwell PRM, 3D Media GPGPU, "Double Precision Float to
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* Single Precision Float":
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*
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* The upper Dword of every Qword will be written with undefined
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* value when converting DF to F.
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*
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* So we need to allocate a temporary that's two registers, and then do
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* a strided MOV to get the lower DWord of every Qword that has the
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* result.
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*/
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fs_reg temp = ibld.vgrf(get_exec_type(inst));
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fs_reg strided_temp = subscript(temp, dst.type, 0);
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assert(inst->size_written == inst->dst.component_size(inst->exec_size));
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inst->dst = strided_temp;
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inst->saturate = false;
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/* As it is an strided destination, we write n-times more being n the
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* size ratio between source and destination types. Update
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* size_written accordingly.
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*/
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inst->size_written = inst->dst.component_size(inst->exec_size);
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ibld.at(block, inst->next).MOV(dst, strided_temp)->saturate = saturate;
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progress = true;
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}
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} else {
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fs_reg temp0 = ibld.vgrf(get_exec_type(inst));
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assert(inst->size_written == inst->dst.component_size(inst->exec_size));
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inst->dst = temp0;
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/* As it is an strided destination, we write n-times more being n the
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* size ratio between source and destination types. Update
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* size_written accordingly.
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*/
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inst->size_written = inst->dst.component_size(inst->exec_size);
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inst->saturate = false;
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/* Now, do the conversion to original destination's type. In next iteration,
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* we will lower it if it is a d2f conversion.
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*/
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ibld.at(block, inst->next).MOV(dst, temp0)->saturate = saturate;
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progress = true;
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}
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}
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if (progress)
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invalidate_live_intervals();
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return progress;
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}
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