2 * Copyright © 2015 Connor Abbott
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
26 #include "brw_fs_builder.h"
31 fs_visitor::lower_d2x()
33 bool progress
= false;
35 foreach_block_and_inst_safe(block
, fs_inst
, inst
, cfg
) {
36 if (inst
->opcode
!= BRW_OPCODE_MOV
)
39 if (inst
->dst
.type
!= BRW_REGISTER_TYPE_F
&&
40 inst
->dst
.type
!= BRW_REGISTER_TYPE_D
&&
41 inst
->dst
.type
!= BRW_REGISTER_TYPE_UD
)
44 if (inst
->src
[0].type
!= BRW_REGISTER_TYPE_DF
&&
45 inst
->src
[0].type
!= BRW_REGISTER_TYPE_UQ
&&
46 inst
->src
[0].type
!= BRW_REGISTER_TYPE_Q
)
49 assert(inst
->dst
.file
== VGRF
);
50 assert(inst
->saturate
== false);
51 fs_reg dst
= inst
->dst
;
53 const fs_builder
ibld(this, block
, inst
);
55 /* From the Broadwell PRM, 3D Media GPGPU, "Double Precision Float to
56 * Single Precision Float":
58 * The upper Dword of every Qword will be written with undefined
59 * value when converting DF to F.
61 * So we need to allocate a temporary that's two registers, and then do
62 * a strided MOV to get the lower DWord of every Qword that has the
65 fs_reg temp
= ibld
.vgrf(inst
->src
[0].type
, 1);
66 fs_reg strided_temp
= subscript(temp
, inst
->dst
.type
, 0);
67 ibld
.MOV(strided_temp
, inst
->src
[0]);
68 ibld
.MOV(dst
, strided_temp
);
75 invalidate_live_intervals();