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90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
//===-- AMDGPUSubtarget.cpp - AMDGPU Subtarget Information ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// \brief Implements the AMDGPU specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#include "AMDGPUSubtarget.h"
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#include "R600InstrInfo.h"
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#include "SIInstrInfo.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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#define DEBUG_TYPE "amdgpu-subtarget"
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#define GET_SUBTARGETINFO_ENUM
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#define GET_SUBTARGETINFO_TARGET_DESC
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#define GET_SUBTARGETINFO_CTOR
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#include "AMDGPUGenSubtargetInfo.inc"
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AMDGPUSubtarget::AMDGPUSubtarget(StringRef TT, StringRef GPU, StringRef FS) :
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AMDGPUGenSubtargetInfo(TT, GPU, FS),
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DevName(GPU),
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Is64bit(false),
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DumpCode(false),
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R600ALUInst(false),
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HasVertexCache(false),
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TexVTXClauseSize(0),
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Gen(AMDGPUSubtarget::R600),
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FP64(false),
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FP64Denormals(false),
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FP32Denormals(false),
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CaymanISA(false),
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EnableIRStructurizer(true),
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EnablePromoteAlloca(false),
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EnableIfCvt(true),
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WavefrontSize(0),
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CFALUBug(false),
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LocalMemorySize(0),
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InstrItins(getInstrItineraryForCPU(GPU)) {
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// On SI+, we want FP64 denormals to be on by default. FP32 denormals can be
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// enabled, but some instructions do not respect them and they run at the
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// double precision rate, so don't enable by default.
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//
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// We want to be able to turn these off, but making this a subtarget feature
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// for SI has the unhelpful behavior that it unsets everything else if you
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// disable it.
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SmallString<256> FullFS("+promote-alloca,+fp64-denormals,");
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FullFS += FS;
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ParseSubtargetFeatures(GPU, FullFS);
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if (getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS) {
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InstrInfo.reset(new R600InstrInfo(*this));
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// FIXME: I don't think think Evergreen has any useful support for
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// denormals, but should be checked. Should we issue a warning somewhere if
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// someone tries to enable these?
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FP32Denormals = false;
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FP64Denormals = false;
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} else {
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InstrInfo.reset(new SIInstrInfo(*this));
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}
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}
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unsigned AMDGPUSubtarget::getStackEntrySize() const {
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assert(getGeneration() <= NORTHERN_ISLANDS);
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switch(getWavefrontSize()) {
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case 16:
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return 8;
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case 32:
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return hasCaymanISA() ? 4 : 8;
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case 64:
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return 4;
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default:
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llvm_unreachable("Illegal wavefront size.");
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}
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}
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