| /* |
| * 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; |
| |
| static bool |
| supports_type_conversion(const fs_inst *inst) { |
| switch (inst->opcode) { |
| case BRW_OPCODE_MOV: |
| case SHADER_OPCODE_MOV_INDIRECT: |
| return true; |
| case BRW_OPCODE_SEL: |
| return inst->dst.type == get_exec_type(inst); |
| default: |
| /* FIXME: We assume the opcodes don't explicitly mentioned |
| * before just work fine with arbitrary conversions. |
| */ |
| return true; |
| } |
| } |
| |
| bool |
| fs_visitor::lower_conversions() |
| { |
| bool progress = false; |
| |
| foreach_block_and_inst(block, fs_inst, inst, cfg) { |
| const fs_builder ibld(this, block, inst); |
| fs_reg dst = inst->dst; |
| bool saturate = inst->saturate; |
| |
| if (supports_type_conversion(inst)) { |
| if (get_exec_type_size(inst) == 8 && type_sz(inst->dst.type) < 8) { |
| /* 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(get_exec_type(inst)); |
| fs_reg strided_temp = subscript(temp, dst.type, 0); |
| |
| assert(inst->size_written == inst->dst.component_size(inst->exec_size)); |
| inst->dst = strided_temp; |
| inst->saturate = false; |
| /* As it is an strided destination, we write n-times more being n the |
| * size ratio between source and destination types. Update |
| * size_written accordingly. |
| */ |
| inst->size_written = inst->dst.component_size(inst->exec_size); |
| ibld.at(block, inst->next).MOV(dst, strided_temp)->saturate = saturate; |
| |
| progress = true; |
| } |
| } else { |
| fs_reg temp0 = ibld.vgrf(get_exec_type(inst)); |
| |
| assert(inst->size_written == inst->dst.component_size(inst->exec_size)); |
| inst->dst = temp0; |
| /* As it is an strided destination, we write n-times more being n the |
| * size ratio between source and destination types. Update |
| * size_written accordingly. |
| */ |
| inst->size_written = inst->dst.component_size(inst->exec_size); |
| inst->saturate = false; |
| /* Now, do the conversion to original destination's type. In next iteration, |
| * we will lower it if it is a d2f conversion. |
| */ |
| ibld.at(block, inst->next).MOV(dst, temp0)->saturate = saturate; |
| |
| progress = true; |
| } |
| } |
| |
| if (progress) |
| invalidate_live_intervals(); |
| |
| return progress; |
| } |