Provide dynamic_stackalloc lowering for MSP430.
This fixes PR4769
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80001 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp
index ec19c38..3e6169e 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -95,6 +95,8 @@
setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
setOperationAction(ISD::SELECT_CC, MVT::i16, Custom);
setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom);
+ setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i8, Expand);
+ setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i16, Expand);
setOperationAction(ISD::CTTZ, MVT::i8, Expand);
setOperationAction(ISD::CTTZ, MVT::i16, Expand);
diff --git a/lib/Target/MSP430/MSP430RegisterInfo.cpp b/lib/Target/MSP430/MSP430RegisterInfo.cpp
index d1401f5..72994eb 100644
--- a/lib/Target/MSP430/MSP430RegisterInfo.cpp
+++ b/lib/Target/MSP430/MSP430RegisterInfo.cpp
@@ -328,7 +328,16 @@
// mergeSPUpdatesUp(MBB, MBBI, StackPtr, &NumBytes);
if (MFI->hasVarSizedObjects()) {
- llvm_unreachable("Not implemented yet!");
+ BuildMI(MBB, MBBI, DL,
+ TII.get(MSP430::MOV16rr), MSP430::SPW).addReg(MSP430::FPW);
+ if (CSSize) {
+ MachineInstr *MI =
+ BuildMI(MBB, MBBI, DL,
+ TII.get(MSP430::SUB16ri), MSP430::SPW)
+ .addReg(MSP430::SPW).addImm(CSSize);
+ // The SRW implicit def is dead.
+ MI->getOperand(3).setIsDead();
+ }
} else {
// adjust stack pointer back: SPW += numbytes
if (NumBytes) {