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
23// Combines which should only apply on SI/VI
24def gfx6gfx7_combines : GICombineGroup<[fcmp_select_to_fmin_fmax_legacy]>;
25
26
27def AMDGPUPreLegalizerCombinerHelper: GICombinerHelper<
28  "AMDGPUGenPreLegalizerCombinerHelper", [all_combines,
29                                          elide_br_by_inverting_cond,
30                                          gfx6gfx7_combines]> {
31  let DisableRuleOption = "amdgpuprelegalizercombiner-disable-rule";
32}
33