68a80a4436
When passing the -vector feature to LLVM (or equivalently the -mno-vx command line argument to clang), the intent is that generated code must not use any vector features (in particular, no vector registers must be used). However, there are some cases where we still could generate such uses; these are all related to some of the additional vector features (like +vector-enhancements-1). Since none of those features are actually usable with -vector, just make sure we disable them all if -vector is given.
102 lines
3.9 KiB
C++
102 lines
3.9 KiB
C++
//===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "SystemZSubtarget.h"
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#include "MCTargetDesc/SystemZMCTargetDesc.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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#define DEBUG_TYPE "systemz-subtarget"
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#define GET_SUBTARGETINFO_TARGET_DESC
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#define GET_SUBTARGETINFO_CTOR
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#include "SystemZGenSubtargetInfo.inc"
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static cl::opt<bool> UseSubRegLiveness(
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"systemz-subreg-liveness",
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cl::desc("Enable subregister liveness tracking for SystemZ (experimental)"),
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cl::Hidden);
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// Pin the vtable to this file.
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void SystemZSubtarget::anchor() {}
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SystemZSubtarget &
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SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
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StringRef CPUName = CPU;
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if (CPUName.empty())
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CPUName = "generic";
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// Parse features string.
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ParseSubtargetFeatures(CPUName, FS);
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// -msoft-float implies -mno-vx.
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if (HasSoftFloat)
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HasVector = false;
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// -mno-vx implicitly disables all vector-related features.
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if (!HasVector) {
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HasVectorEnhancements1 = false;
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HasVectorEnhancements2 = false;
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HasVectorPackedDecimal = false;
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HasVectorPackedDecimalEnhancement = false;
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}
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return *this;
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}
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SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
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const std::string &FS,
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const TargetMachine &TM)
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: SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
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HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
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HasPopulationCount(false), HasMessageSecurityAssist3(false),
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HasMessageSecurityAssist4(false), HasResetReferenceBitsMultiple(false),
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HasFastSerialization(false), HasInterlockedAccess1(false),
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HasMiscellaneousExtensions(false),
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HasExecutionHint(false), HasLoadAndTrap(false),
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HasTransactionalExecution(false), HasProcessorAssist(false),
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HasDFPZonedConversion(false), HasEnhancedDAT2(false),
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HasVector(false), HasLoadStoreOnCond2(false),
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HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false),
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HasDFPPackedConversion(false),
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HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
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HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
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HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
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HasInsertReferenceBitsMultiple(false),
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HasMiscellaneousExtensions3(false), HasMessageSecurityAssist9(false),
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HasVectorEnhancements2(false), HasVectorPackedDecimalEnhancement(false),
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HasEnhancedSort(false), HasDeflateConversion(false), HasSoftFloat(false),
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TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
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TLInfo(TM, *this), TSInfo(), FrameLowering() {}
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bool SystemZSubtarget::enableSubRegLiveness() const {
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return UseSubRegLiveness;
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}
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bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
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CodeModel::Model CM) const {
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// PC32DBL accesses require the low bit to be clear.
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//
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// FIXME: Explicitly check for functions: the datalayout is currently
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// missing information about function pointers.
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const DataLayout &DL = GV->getParent()->getDataLayout();
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if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
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return false;
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// For the small model, all locally-binding symbols are in range.
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if (CM == CodeModel::Small)
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return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
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// For Medium and above, assume that the symbol is not within the 4GB range.
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// Taking the address of locally-defined text would be OK, but that
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// case isn't easy to detect.
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return false;
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}
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