[PostRA scheduling] Allow a target to do scheduling when it wants post RA.
SystemZ needs to do its scheduling after branch relaxation, which can
only happen after block placement, and therefore the standard
PostRAScheduler point in the pass sequence is too early.
TargetMachine::targetSchedulesPostRAScheduling() is a new method that
signals on returning true that target will insert the final scheduling
pass on its own.
Reviewed by Hal Finkel
llvm-svn: 255234
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
index 22beaad..f305e85 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
@@ -16,6 +16,7 @@
using namespace llvm;
+extern cl::opt<bool> MISchedPostRA;
extern "C" void LLVMInitializeSystemZTarget() {
// Register the target.
RegisterTargetMachine<SystemZTargetMachine> X(TheSystemZTarget);
@@ -163,6 +164,16 @@
if (getOptLevel() != CodeGenOpt::None)
addPass(createSystemZElimComparePass(getSystemZTargetMachine()), false);
addPass(createSystemZLongBranchPass(getSystemZTargetMachine()));
+
+ // Do final scheduling after all other optimizations, to get an
+ // optimal input for the decoder (branch relaxation must happen
+ // after block placement).
+ if (getOptLevel() != CodeGenOpt::None) {
+ if (MISchedPostRA)
+ addPass(&PostMachineSchedulerID);
+ else
+ addPass(&PostRASchedulerID);
+ }
}
TargetPassConfig *SystemZTargetMachine::createPassConfig(PassManagerBase &PM) {
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetMachine.h b/llvm/lib/Target/SystemZ/SystemZTargetMachine.h
index 0a81e1f..1a8f1f7 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetMachine.h
+++ b/llvm/lib/Target/SystemZ/SystemZTargetMachine.h
@@ -43,6 +43,9 @@
TargetLoweringObjectFile *getObjFileLowering() const override {
return TLOF.get();
}
+
+ bool targetSchedulesPostRAScheduling() const override { return true; };
+
};
} // end namespace llvm