1//=- AMDGPUCombine.td - Define AMDGPU Combine Rules ----------*- tablegen -*-=//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9include "llvm/Target/GlobalISel/Combine.td"
10
11// TODO: This really belongs after legalization after scalarization.
12// TODO: GICombineRules should accept subtarget predicates
13
14def fmin_fmax_legacy_matchdata : GIDefMatchData<"FMinFMaxLegacyInfo">;
15
16def fcmp_select_to_fmin_fmax_legacy : GICombineRule<
17  (defs root:$select, fmin_fmax_legacy_matchdata:$matchinfo),
18  (match (wip_match_opcode G_SELECT):$select,
19         [{ return matchFMinFMaxLegacy(*${select}, MRI, *MF, ${matchinfo}); }]),
20  (apply [{ applySelectFCmpToFMinToFMaxLegacy(*${select}, ${matchinfo}); }])>;
21
22
23def uchar_to_float : GICombineRule<
24  (defs root:$itofp),
25  (match (wip_match_opcode G_UITOFP, G_SITOFP):$itofp,
26         [{ return matchUCharToFloat(*${itofp}, MRI, *MF, Helper); }]),
27  (apply [{ applyUCharToFloat(*${itofp}); }])>;
28
29
30// Combines which should only apply on SI/VI
31def gfx6gfx7_combines : GICombineGroup<[fcmp_select_to_fmin_fmax_legacy]>;
32
33
34def AMDGPUPreLegalizerCombinerHelper: GICombinerHelper<
35  "AMDGPUGenPreLegalizerCombinerHelper", [all_combines,
36                                          elide_br_by_inverting_cond]> {
37  let DisableRuleOption = "amdgpuprelegalizercombiner-disable-rule";
38}
39
40def AMDGPUPostLegalizerCombinerHelper: GICombinerHelper<
41  "AMDGPUGenPostLegalizerCombinerHelper", [all_combines,
42                                           gfx6gfx7_combines, uchar_to_float]> {
43  let DisableRuleOption = "amdgpupostlegalizercombiner-disable-rule";
44}
45