1//===-- AMDGPUFeatures.td - AMDGPU Feature Definitions -----*- 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
9def FeatureFP64 : SubtargetFeature<"fp64",
10  "FP64",
11  "true",
12  "Enable double precision operations"
13>;
14
15def FeatureFMA : SubtargetFeature<"fmaf",
16  "FMA",
17  "true",
18  "Enable single precision FMA (not as fast as mul+add, but fused)"
19>;
20
21// Some instructions do not support denormals despite this flag. Using
22// fp32 denormals also causes instructions to run at the double
23// precision rate for the device.
24def FeatureFP32Denormals : SubtargetFeature<"fp32-denormals",
25  "FP32Denormals",
26  "true",
27  "Enable single precision denormal handling"
28>;
29
30class SubtargetFeatureLocalMemorySize <int Value> : SubtargetFeature<
31  "localmemorysize"#Value,
32  "LocalMemorySize",
33  !cast<string>(Value),
34  "The size of local memory in bytes"
35>;
36
37def FeatureLocalMemorySize0 : SubtargetFeatureLocalMemorySize<0>;
38def FeatureLocalMemorySize32768 : SubtargetFeatureLocalMemorySize<32768>;
39def FeatureLocalMemorySize65536 : SubtargetFeatureLocalMemorySize<65536>;
40
41class SubtargetFeatureWavefrontSize <int Value> : SubtargetFeature<
42  "wavefrontsize"#Value,
43  "WavefrontSize",
44  !cast<string>(Value),
45  "The number of threads per wavefront"
46>;
47
48def FeatureWavefrontSize16 : SubtargetFeatureWavefrontSize<16>;
49def FeatureWavefrontSize32 : SubtargetFeatureWavefrontSize<32>;
50def FeatureWavefrontSize64 : SubtargetFeatureWavefrontSize<64>;
51
52class SubtargetFeatureGeneration <string Value, string FeatureName,
53                                 string Subtarget,
54                                  list<SubtargetFeature> Implies> :
55        SubtargetFeature <FeatureName, "Gen", Subtarget#"::"#Value,
56                          Value#" GPU generation", Implies>;
57
58def FeaturePromoteAlloca : SubtargetFeature <"promote-alloca",
59  "EnablePromoteAlloca",
60  "true",
61  "Enable promote alloca pass"
62>;
63
64