Move the eliminateCallFramePseudoInstr method from TargetRegisterInfo
to TargetFrameLowering, where it belongs. Incidentally, this allows us
to delete some duplicated (and slightly different!) code in TRI.
There are potentially other layering problems that can be cleaned up
as a result, or in a similar manner.
The refactoring was OK'd by Anton Korobeynikov on llvmdev.
Note: this touches the target interfaces, so out-of-tree targets may
be affected.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175788 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MBlaze/MBlazeFrameLowering.cpp b/lib/Target/MBlaze/MBlazeFrameLowering.cpp
index b6edbba..172304b 100644
--- a/lib/Target/MBlaze/MBlazeFrameLowering.cpp
+++ b/lib/Target/MBlaze/MBlazeFrameLowering.cpp
@@ -426,6 +426,45 @@
}
}
+// Eliminate ADJCALLSTACKDOWN/ADJCALLSTACKUP pseudo instructions
+void MBlazeFrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ const MBlazeInstrInfo &TII =
+ *static_cast<const MBlazeInstrInfo*>(MF.getTarget().getInstrInfo());
+ if (!hasReservedCallFrame(MF)) {
+ // If we have a frame pointer, turn the adjcallstackup instruction into a
+ // 'addi r1, r1, -<amt>' and the adjcallstackdown instruction into
+ // 'addi r1, r1, <amt>'
+ MachineInstr *Old = I;
+ int Amount = Old->getOperand(0).getImm() + 4;
+ if (Amount != 0) {
+ // We need to keep the stack aligned properly. To do this, we round the
+ // amount of space needed for the outgoing arguments up to the next
+ // alignment boundary.
+ unsigned Align = getStackAlignment();
+ Amount = (Amount+Align-1)/Align*Align;
+
+ MachineInstr *New;
+ if (Old->getOpcode() == MBlaze::ADJCALLSTACKDOWN) {
+ New = BuildMI(MF,Old->getDebugLoc(), TII.get(MBlaze::ADDIK),MBlaze::R1)
+ .addReg(MBlaze::R1).addImm(-Amount);
+ } else {
+ assert(Old->getOpcode() == MBlaze::ADJCALLSTACKUP);
+ New = BuildMI(MF,Old->getDebugLoc(), TII.get(MBlaze::ADDIK),MBlaze::R1)
+ .addReg(MBlaze::R1).addImm(Amount);
+ }
+
+ // Replace the pseudo instruction with a new instruction...
+ MBB.insert(I, New);
+ }
+ }
+
+ // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
+ MBB.erase(I);
+}
+
+
void MBlazeFrameLowering::
processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {