//
//===----------------------------------------------------------------------===//
-#include "SystemZTargetAsmInfo.h"
#include "SystemZTargetMachine.h"
-#include "SystemZ.h"
-#include "llvm/PassManager.h"
-#include "llvm/Target/TargetRegistry.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+
using namespace llvm;
extern "C" void LLVMInitializeSystemZTarget() {
// Register the target.
RegisterTargetMachine<SystemZTargetMachine> X(TheSystemZTarget);
- RegisterAsmInfo<SystemZTargetAsmInfo> Y(TheSystemZTarget);
}
-/// SystemZTargetMachine ctor - Create an ILP64 architecture model
-///
-SystemZTargetMachine::SystemZTargetMachine(const Target &T,
- const std::string &TT,
- const std::string &FS)
- : LLVMTargetMachine(T, TT),
- Subtarget(TT, FS),
- DataLayout("E-p:64:64:64-i8:8:16-i16:16:16-i32:32:32-i64:64:64-f32:32:32"
- "-f64:64:64-f128:128:128-a0:16:16"),
- InstrInfo(*this), TLInfo(*this),
- FrameInfo(TargetFrameInfo::StackGrowsDown, 8, -160) {
-
- if (getRelocationModel() == Reloc::Default)
- setRelocationModel(Reloc::Static);
+SystemZTargetMachine::SystemZTargetMachine(const Target &T, StringRef TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL)
+ : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
+ TLOF(make_unique<TargetLoweringObjectFileELF>()),
+ Subtarget(TT, CPU, FS, *this) {
+ initAsmInfo();
+}
+
+SystemZTargetMachine::~SystemZTargetMachine() {}
+
+namespace {
+/// SystemZ Code Generator Pass Configuration Options.
+class SystemZPassConfig : public TargetPassConfig {
+public:
+ SystemZPassConfig(SystemZTargetMachine *TM, PassManagerBase &PM)
+ : TargetPassConfig(TM, PM) {}
+
+ SystemZTargetMachine &getSystemZTargetMachine() const {
+ return getTM<SystemZTargetMachine>();
+ }
+
+ void addIRPasses() override;
+ bool addInstSelector() override;
+ bool addPreSched2() override;
+ bool addPreEmitPass() override;
+};
+} // end anonymous namespace
+
+void SystemZPassConfig::addIRPasses() {
+ TargetPassConfig::addIRPasses();
}
-bool SystemZTargetMachine::addInstSelector(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel) {
- // Install an instruction selector.
- PM.add(createSystemZISelDag(*this, OptLevel));
+bool SystemZPassConfig::addInstSelector() {
+ addPass(createSystemZISelDag(getSystemZTargetMachine(), getOptLevel()));
return false;
}
+
+bool SystemZPassConfig::addPreSched2() {
+ if (getOptLevel() != CodeGenOpt::None &&
+ getSystemZTargetMachine().getSubtargetImpl()->hasLoadStoreOnCond())
+ addPass(&IfConverterID);
+ return true;
+}
+
+bool SystemZPassConfig::addPreEmitPass() {
+ // We eliminate comparisons here rather than earlier because some
+ // transformations can change the set of available CC values and we
+ // generally want those transformations to have priority. This is
+ // especially true in the commonest case where the result of the comparison
+ // is used by a single in-range branch instruction, since we will then
+ // be able to fuse the compare and the branch instead.
+ //
+ // For example, two-address NILF can sometimes be converted into
+ // three-address RISBLG. NILF produces a CC value that indicates whether
+ // the low word is zero, but RISBLG does not modify CC at all. On the
+ // other hand, 64-bit ANDs like NILL can sometimes be converted to RISBG.
+ // The CC value produced by NILL isn't useful for our purposes, but the
+ // value produced by RISBG can be used for any comparison with zero
+ // (not just equality). So there are some transformations that lose
+ // CC values (while still being worthwhile) and others that happen to make
+ // the CC result more useful than it was originally.
+ //
+ // Another reason is that we only want to use BRANCH ON COUNT in cases
+ // where we know that the count register is not going to be spilled.
+ //
+ // Doing it so late makes it more likely that a register will be reused
+ // between the comparison and the branch, but it isn't clear whether
+ // preventing that would be a win or not.
+ if (getOptLevel() != CodeGenOpt::None)
+ addPass(createSystemZElimComparePass(getSystemZTargetMachine()));
+ if (getOptLevel() != CodeGenOpt::None)
+ addPass(createSystemZShortenInstPass(getSystemZTargetMachine()));
+ addPass(createSystemZLongBranchPass(getSystemZTargetMachine()));
+ return true;
+}
+
+TargetPassConfig *SystemZTargetMachine::createPassConfig(PassManagerBase &PM) {
+ return new SystemZPassConfig(this, PM);
+}