[NFC][PowerPC] Custom PowerPC specific machine-scheduler
This patch lays the groundwork for extending the generic machine scheduler by providing a PPC-specific implementation.
There are no functional changes as this is an incremental patch that simply provides the necessary overrides which just
encapsulate the behavior of the generic scheduler. Subsequent patches will add specific behavior.
Differential Revision: https://reviews.llvm.org/D59284
llvm-svn: 357047
diff --git a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
index 58057d3..444a3a5 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -13,6 +13,7 @@
#include "PPCTargetMachine.h"
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "PPC.h"
+#include "PPCMachineScheduler.h"
#include "PPCSubtarget.h"
#include "PPCTargetObjectFile.h"
#include "PPCTargetTransformInfo.h"
@@ -237,6 +238,23 @@
return CodeModel::Small;
}
+
+static ScheduleDAGInstrs *createPPCMachineScheduler(MachineSchedContext *C) {
+ ScheduleDAGMILive *DAG =
+ new ScheduleDAGMILive(C, llvm::make_unique<PPCPreRASchedStrategy>(C));
+ // add DAG Mutations here.
+ DAG->addMutation(createCopyConstrainDAGMutation(DAG->TII, DAG->TRI));
+ return DAG;
+}
+
+static ScheduleDAGInstrs *createPPCPostMachineScheduler(
+ MachineSchedContext *C) {
+ ScheduleDAGMI *DAG =
+ new ScheduleDAGMI(C, llvm::make_unique<PPCPostRASchedStrategy>(C), true);
+ // add DAG Mutations here.
+ return DAG;
+}
+
// 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
@@ -330,6 +348,20 @@
void addPreRegAlloc() override;
void addPreSched2() override;
void addPreEmitPass() override;
+ ScheduleDAGInstrs *
+ createMachineScheduler(MachineSchedContext *C) const override {
+ const PPCSubtarget &ST = C->MF->getSubtarget<PPCSubtarget>();
+ if (ST.usePPCPreRASchedStrategy())
+ return createPPCMachineScheduler(C);
+ return nullptr;
+ }
+ ScheduleDAGInstrs *
+ createPostMachineScheduler(MachineSchedContext *C) const override {
+ const PPCSubtarget &ST = C->MF->getSubtarget<PPCSubtarget>();
+ if (ST.usePPCPostRASchedStrategy())
+ return createPPCPostMachineScheduler(C);
+ return nullptr;
+ }
};
} // end anonymous namespace
@@ -468,3 +500,13 @@
PPCTargetMachine::getTargetTransformInfo(const Function &F) {
return TargetTransformInfo(PPCTTIImpl(this, F));
}
+
+static MachineSchedRegistry
+PPCPreRASchedRegistry("ppc-prera",
+ "Run PowerPC PreRA specific scheduler",
+ createPPCMachineScheduler);
+
+static MachineSchedRegistry
+PPCPostRASchedRegistry("ppc-postra",
+ "Run PowerPC PostRA specific scheduler",
+ createPPCPostMachineScheduler);