#include "PPCTargetMachine.h"
#include "PPC.h"
+#include "PPCTargetObjectFile.h"
+#include "PPCTargetTransformInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
+#include "llvm/IR/LegacyPassManager.h"
#include "llvm/MC/MCStreamer.h"
-#include "llvm/PassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetOptions.h"
+#include "llvm/Transforms/Scalar.h"
using namespace llvm;
static cl::
opt<bool> DisableCTRLoops("disable-ppc-ctrloops", cl::Hidden,
cl::desc("Disable CTR loops for PPC"));
+static cl::
+opt<bool> DisablePreIncPrep("disable-ppc-preinc-prep", cl::Hidden,
+ cl::desc("Disable PPC loop preinc prep"));
+
static cl::opt<bool>
VSXFMAMutateEarly("schedule-ppc-vsx-fma-mutation-early",
cl::Hidden, cl::desc("Schedule VSX FMA instruction mutation early"));
+static cl::
+opt<bool> DisableVSXSwapRemoval("disable-ppc-vsx-swap-removal", cl::Hidden,
+ cl::desc("Disable VSX Swap Removal for PPC"));
+
+static cl::opt<bool>
+EnableGEPOpt("ppc-gep-opt", cl::Hidden,
+ cl::desc("Enable optimizations on complex GEPs"),
+ cl::init(true));
+
+static cl::opt<bool>
+EnablePrefetch("enable-ppc-prefetching",
+ cl::desc("disable software prefetching on PPC"),
+ cl::init(false), cl::Hidden);
+
+static cl::opt<bool>
+EnableExtraTOCRegDeps("enable-ppc-extra-toc-reg-deps",
+ cl::desc("Add extra TOC register dependencies"),
+ cl::init(true), cl::Hidden);
+
+static cl::opt<bool>
+EnableMachineCombinerPass("ppc-machine-combiner",
+ cl::desc("Enable the machine combiner pass"),
+ cl::init(true), cl::Hidden);
+
extern "C" void LLVMInitializePowerPCTarget() {
// Register the targets
RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
RegisterTargetMachine<PPC64TargetMachine> C(ThePPC64LETarget);
}
-static std::string computeFSAdditions(StringRef FS, CodeGenOpt::Level OL, StringRef TT) {
+/// Return the datalayout string of a subtarget.
+static std::string getDataLayoutString(const Triple &T) {
+ bool is64Bit = T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le;
+ std::string Ret;
+
+ // Most PPC* platforms are big endian, PPC64LE is little endian.
+ if (T.getArch() == Triple::ppc64le)
+ Ret = "e";
+ else
+ Ret = "E";
+
+ Ret += DataLayout::getManglingComponent(T);
+
+ // PPC32 has 32 bit pointers. The PS3 (OS Lv2) is a PPC64 machine with 32 bit
+ // pointers.
+ if (!is64Bit || T.getOS() == Triple::Lv2)
+ Ret += "-p:32:32";
+
+ // Note, the alignment values for f64 and i64 on ppc64 in Darwin
+ // documentation are wrong; these are correct (i.e. "what gcc does").
+ if (is64Bit || !T.isOSDarwin())
+ Ret += "-i64:64";
+ else
+ Ret += "-f64:32:64";
+
+ // PPC64 has 32 and 64 bit registers, PPC32 has only 32 bit ones.
+ if (is64Bit)
+ Ret += "-n32:64";
+ else
+ Ret += "-n32";
+
+ return Ret;
+}
+
+static std::string computeFSAdditions(StringRef FS, CodeGenOpt::Level OL,
+ const Triple &TT) {
std::string FullFS = FS;
- Triple TargetTriple(TT);
// Make sure 64-bit features are available when CPUname is generic
- if (TargetTriple.getArch() == Triple::ppc64 ||
- TargetTriple.getArch() == Triple::ppc64le) {
+ if (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le) {
if (!FullFS.empty())
FullFS = "+64bit," + FullFS;
else
else
FullFS = "+crbits";
}
+
+ if (OL != CodeGenOpt::None) {
+ if (!FullFS.empty())
+ FullFS = "+invariant-function-descriptors," + FullFS;
+ else
+ FullFS = "+invariant-function-descriptors";
+ }
+
return FullFS;
}
-// The FeatureString here is a little subtle. We are modifying the feature string
-// with what are (currently) non-function specific overrides as it goes into the
-// LLVMTargetMachine constructor and then using the stored value in the
+static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
+ // If it isn't a Mach-O file then it's going to be a linux ELF
+ // object file.
+ if (TT.isOSDarwin())
+ return make_unique<TargetLoweringObjectFileMachO>();
+
+ return make_unique<PPC64LinuxTargetObjectFile>();
+}
+
+static PPCTargetMachine::PPCABI computeTargetABI(const Triple &TT,
+ const TargetOptions &Options) {
+ if (Options.MCOptions.getABIName().startswith("elfv1"))
+ return PPCTargetMachine::PPC_ABI_ELFv1;
+ else if (Options.MCOptions.getABIName().startswith("elfv2"))
+ return PPCTargetMachine::PPC_ABI_ELFv2;
+
+ assert(Options.MCOptions.getABIName().empty() &&
+ "Unknown target-abi option!");
+
+ if (!TT.isMacOSX()) {
+ switch (TT.getArch()) {
+ case Triple::ppc64le:
+ return PPCTargetMachine::PPC_ABI_ELFv2;
+ case Triple::ppc64:
+ return PPCTargetMachine::PPC_ABI_ELFv1;
+ default:
+ // Fallthrough.
+ ;
+ }
+ }
+ return PPCTargetMachine::PPC_ABI_UNKNOWN;
+}
+
+// The FeatureString here is a little subtle. We are modifying the feature
+// string with what are (currently) non-function specific overrides as it goes
+// into the LLVMTargetMachine constructor and then using the stored value in the
// Subtarget constructor below it.
-PPCTargetMachine::PPCTargetMachine(const Target &T, StringRef TT, StringRef CPU,
- StringRef FS, const TargetOptions &Options,
+PPCTargetMachine::PPCTargetMachine(const Target &T, const Triple &TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL)
- : LLVMTargetMachine(T, TT, CPU, computeFSAdditions(FS, OL, TT), Options, RM,
- CM, OL),
- Subtarget(TT, CPU, TargetFS, *this) {
+ : LLVMTargetMachine(T, getDataLayoutString(TT), TT, CPU,
+ computeFSAdditions(FS, OL, TT), Options, RM, CM, OL),
+ TLOF(createTLOF(getTargetTriple())),
+ TargetABI(computeTargetABI(TT, Options)),
+ Subtarget(TargetTriple, CPU, computeFSAdditions(FS, OL, TT), *this) {
+
+ // For the estimates, convergence is quadratic, so we essentially double the
+ // number of digits correct after every iteration. For both FRE and FRSQRTE,
+ // the minimum architected relative accuracy is 2^-5. When hasRecipPrec(),
+ // this is 2^-14. IEEE float has 23 digits and double has 52 digits.
+ unsigned RefinementSteps = Subtarget.hasRecipPrec() ? 1 : 3,
+ RefinementSteps64 = RefinementSteps + 1;
+
+ this->Options.Reciprocals.setDefaults("sqrtf", true, RefinementSteps);
+ this->Options.Reciprocals.setDefaults("vec-sqrtf", true, RefinementSteps);
+ this->Options.Reciprocals.setDefaults("divf", true, RefinementSteps);
+ this->Options.Reciprocals.setDefaults("vec-divf", true, RefinementSteps);
+
+ this->Options.Reciprocals.setDefaults("sqrtd", true, RefinementSteps64);
+ this->Options.Reciprocals.setDefaults("vec-sqrtd", true, RefinementSteps64);
+ this->Options.Reciprocals.setDefaults("divd", true, RefinementSteps64);
+ this->Options.Reciprocals.setDefaults("vec-divd", true, RefinementSteps64);
+
initAsmInfo();
}
+PPCTargetMachine::~PPCTargetMachine() {}
+
void PPC32TargetMachine::anchor() { }
-PPC32TargetMachine::PPC32TargetMachine(const Target &T, StringRef TT,
+PPC32TargetMachine::PPC32TargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL)
- : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL) {
-}
+ : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL) {}
void PPC64TargetMachine::anchor() { }
-PPC64TargetMachine::PPC64TargetMachine(const Target &T, StringRef TT,
- StringRef CPU, StringRef FS,
+PPC64TargetMachine::PPC64TargetMachine(const Target &T, const Triple &TT,
+ StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL)
- : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL) {
-}
+ : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL) {}
const PPCSubtarget *
PPCTargetMachine::getSubtargetImpl(const Function &F) const {
- AttributeSet FnAttrs = F.getAttributes();
- Attribute CPUAttr =
- FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-cpu");
- Attribute FSAttr =
- FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-features");
+ Attribute CPUAttr = F.getFnAttribute("target-cpu");
+ Attribute FSAttr = F.getFnAttribute("target-features");
std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
? CPUAttr.getValueAsString().str()
// creation will depend on the TM and the code generation flags on the
// function that reside in TargetOptions.
resetTargetOptions(F);
- I = llvm::make_unique<PPCSubtarget>(TargetTriple, CPU, FS, *this);
+ I = llvm::make_unique<PPCSubtarget>(
+ TargetTriple, CPU,
+ // FIXME: It would be good to have the subtarget additions here
+ // not necessary. Anything that turns them on/off (overrides) ends
+ // up being put at the end of the feature string, but the defaults
+ // shouldn't require adding them. Fixing this means pulling Feature64Bit
+ // out of most of the target cpus in the .td file and making it set only
+ // as part of initialization via the TargetTriple.
+ computeFSAdditions(FS, getOptLevel(), getTargetTriple()), *this);
}
return I.get();
}
return getTM<PPCTargetMachine>();
}
- const PPCSubtarget &getPPCSubtarget() const {
- return *getPPCTargetMachine().getSubtargetImpl();
- }
-
void addIRPasses() override;
bool addPreISel() override;
bool addILPOpts() override;
bool addInstSelector() override;
- bool addPreRegAlloc() override;
- bool addPreSched2() override;
- bool addPreEmitPass() override;
+ void addMachineSSAOptimization() override;
+ void addPreRegAlloc() override;
+ void addPreSched2() override;
+ void addPreEmitPass() override;
};
} // namespace
void PPCPassConfig::addIRPasses() {
addPass(createAtomicExpandPass(&getPPCTargetMachine()));
+
+ // For the BG/Q (or if explicitly requested), add explicit data prefetch
+ // intrinsics.
+ bool UsePrefetching = TM->getTargetTriple().getVendor() == Triple::BGQ &&
+ getOptLevel() != CodeGenOpt::None;
+ if (EnablePrefetch.getNumOccurrences() > 0)
+ UsePrefetching = EnablePrefetch;
+ if (UsePrefetching)
+ addPass(createPPCLoopDataPrefetchPass());
+
+ if (TM->getOptLevel() == CodeGenOpt::Aggressive && EnableGEPOpt) {
+ // Call SeparateConstOffsetFromGEP pass to extract constants within indices
+ // and lower a GEP with multiple indices to either arithmetic operations or
+ // multiple GEPs with single index.
+ addPass(createSeparateConstOffsetFromGEPPass(TM, true));
+ // Call EarlyCSE pass to find and remove subexpressions in the lowered
+ // result.
+ addPass(createEarlyCSEPass());
+ // Do loop invariant code motion in case part of the lowered result is
+ // invariant.
+ addPass(createLICMPass());
+ }
+
TargetPassConfig::addIRPasses();
}
bool PPCPassConfig::addPreISel() {
+ if (!DisablePreIncPrep && getOptLevel() != CodeGenOpt::None)
+ addPass(createPPCLoopPreIncPrepPass(getPPCTargetMachine()));
+
if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
addPass(createPPCCTRLoops(getPPCTargetMachine()));
bool PPCPassConfig::addILPOpts() {
addPass(&EarlyIfConverterID);
+
+ if (EnableMachineCombinerPass)
+ addPass(&MachineCombinerID);
+
return true;
}
return false;
}
-bool PPCPassConfig::addPreRegAlloc() {
+void PPCPassConfig::addMachineSSAOptimization() {
+ TargetPassConfig::addMachineSSAOptimization();
+ // For little endian, remove where possible the vector swap instructions
+ // introduced at code generation to normalize vector element order.
+ if (TM->getTargetTriple().getArch() == Triple::ppc64le &&
+ !DisableVSXSwapRemoval)
+ addPass(createPPCVSXSwapRemovalPass());
+}
+
+void PPCPassConfig::addPreRegAlloc() {
initializePPCVSXFMAMutatePass(*PassRegistry::getPassRegistry());
insertPass(VSXFMAMutateEarly ? &RegisterCoalescerID : &MachineSchedulerID,
&PPCVSXFMAMutateID);
- return false;
+ if (getPPCTargetMachine().getRelocationModel() == Reloc::PIC_)
+ addPass(createPPCTLSDynamicCallPass());
+ if (EnableExtraTOCRegDeps)
+ addPass(createPPCTOCRegDepsPass());
}
-bool PPCPassConfig::addPreSched2() {
- addPass(createPPCVSXCopyCleanupPass());
-
+void PPCPassConfig::addPreSched2() {
if (getOptLevel() != CodeGenOpt::None)
addPass(&IfConverterID);
-
- return true;
}
-bool PPCPassConfig::addPreEmitPass() {
+void PPCPassConfig::addPreEmitPass() {
if (getOptLevel() != CodeGenOpt::None)
- addPass(createPPCEarlyReturnPass());
+ addPass(createPPCEarlyReturnPass(), false);
// Must run branch selection immediately preceding the asm printer.
- addPass(createPPCBranchSelectionPass());
- return false;
+ addPass(createPPCBranchSelectionPass(), false);
}
-void PPCTargetMachine::addAnalysisPasses(PassManagerBase &PM) {
- // Add first the target-independent BasicTTI pass, then our PPC pass. This
- // allows the PPC pass to delegate to the target independent layer when
- // appropriate.
- PM.add(createBasicTargetTransformInfoPass(this));
- PM.add(createPPCTargetTransformInfoPass(this));
+TargetIRAnalysis PPCTargetMachine::getTargetIRAnalysis() {
+ return TargetIRAnalysis([this](const Function &F) {
+ return TargetTransformInfo(PPCTTIImpl(this, F));
+ });
}
-
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