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-rw-r--r--llvm/lib/Target/PowerPC/PPCISelLowering.cpp35
1 files changed, 34 insertions, 1 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 0d5b6932a7e..4b29bc78862 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -3199,6 +3199,39 @@ isOperandValidForConstraint(SDOperand Op, char Letter, SelectionDAG &DAG) {
return TargetLowering::isOperandValidForConstraint(Op, Letter, DAG);
}
+// isLegalAddressingMode - Return true if the addressing mode represented
+// by AM is legal for this target, for a load/store of the specified type.
+bool PPCTargetLowering::isLegalAddressingMode(const AddrMode &AM,
+ const Type *Ty) const {
+ // FIXME: PPC does not allow r+i addressing modes for vectors!
+
+ // PPC allows a sign-extended 16-bit immediate field.
+ if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
+ return false;
+
+ // No global is ever allowed as a base.
+ if (AM.BaseGV)
+ return false;
+
+ // PPC only support r+r,
+ switch (AM.Scale) {
+ case 0: // "r+i" or just "i", depending on HasBaseReg.
+ break;
+ case 1:
+ if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
+ return false;
+ // Otherwise we have r+r or r+i.
+ break;
+ case 2:
+ if (AM.HasBaseReg || AM.BaseOffs) // 2*r+r or 2*r+i is not allowed.
+ return false;
+ // Allow 2*r as r+r.
+ break;
+ }
+
+ return true;
+}
+
/// isLegalAddressImmediate - Return true if the integer value can be used
/// as the offset of the target addressing mode for load / store of the
/// given type.
@@ -3208,7 +3241,7 @@ bool PPCTargetLowering::isLegalAddressImmediate(int64_t V,const Type *Ty) const{
}
bool PPCTargetLowering::isLegalAddressImmediate(llvm::GlobalValue* GV) const {
- return TargetLowering::isLegalAddressImmediate(GV);
+ return false;
}
SDOperand PPCTargetLowering::LowerFRAMEADDR(SDOperand Op, SelectionDAG &DAG)
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