Implement dynamic allocas
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75985 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SystemZ/SystemZISelLowering.cpp b/lib/Target/SystemZ/SystemZISelLowering.cpp
index e50dc4f..c1004e1 100644
--- a/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -68,6 +68,7 @@
setOperationAction(ISD::BR_CC, MVT::i64, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
+ setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
// FIXME: Can we lower these 2 efficiently?
setOperationAction(ISD::SETCC, MVT::i32, Expand);
diff --git a/lib/Target/SystemZ/SystemZRegisterInfo.cpp b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
index 087da0b..fe116b6 100644
--- a/lib/Target/SystemZ/SystemZRegisterInfo.cpp
+++ b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
@@ -85,7 +85,13 @@
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (!hasReservedCallFrame(MF)) {
- assert(0 && "Not implemented yet!");
+ // If the stack pointer can be changed after prologue, turn the
+ // adjcallstackup instruction into a 'sub R15, <amt>' and the
+ // adjcallstackdown instruction into 'add R15, <amt>'
+ MachineInstr *Old = I;
+ uint64_t Amount = Old->getOperand(0).getImm();
+
+ assert((Amount == 0) && "Not implemented yet!");
}
MBB.erase(I);