llvm/lib/Target/AMDGPU/AMDGPUFeatures.td

//===-- AMDGPUFeatures.td - AMDGPU Feature Definitions -----*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

def FeatureFP64 : SubtargetFeature<"fp64",
  "FP64",
  "true",
  "Enable double precision operations"
>;

def FeatureFMA : SubtargetFeature<"fmaf",
  "FMA",
  "true",
  "Enable single precision FMA (not as fast as mul+add, but fused)"
>;

// Some instructions do not support denormals despite this flag. Using
// fp32 denormals also causes instructions to run at the double
// precision rate for the device.
def FeatureFP32Denormals : SubtargetFeature<"fp32-denormals",
  "FP32Denormals",
  "true",
  "Enable single precision denormal handling"
>;

class SubtargetFeatureLocalMemorySize <int Value> : SubtargetFeature<
  "localmemorysize"#Value,
  "LocalMemorySize",
  !cast<string>(Value),
  "The size of local memory in bytes"
>;

def FeatureLocalMemorySize0 : SubtargetFeatureLocalMemorySize<0>;
def FeatureLocalMemorySize32768 : SubtargetFeatureLocalMemorySize<32768>;
def FeatureLocalMemorySize65536 : SubtargetFeatureLocalMemorySize<65536>;

class SubtargetFeatureWavefrontSize <int Value> : SubtargetFeature<
  "wavefrontsize"#Value,
  "WavefrontSize",
  !cast<string>(Value),
  "The number of threads per wavefront"
>;

def FeatureWavefrontSize16 : SubtargetFeatureWavefrontSize<16>;
def FeatureWavefrontSize32 : SubtargetFeatureWavefrontSize<32>;
def FeatureWavefrontSize64 : SubtargetFeatureWavefrontSize<64>;

class SubtargetFeatureGeneration <string Value, string FeatureName,
                                 string Subtarget,
                                  list<SubtargetFeature> Implies> :
        SubtargetFeature <FeatureName, "Gen", Subtarget#"::"#Value,
                          Value#" GPU generation", Implies>;

def FeaturePromoteAlloca : SubtargetFeature <"promote-alloca",
  "EnablePromoteAlloca",
  "true",
  "Enable promote alloca pass"
>;