zext / truncate is free on msp430. Inform codegen about this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93556 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp
index aea8bef..b794911 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -967,6 +967,31 @@
}
}
+bool MSP430TargetLowering::isTruncateFree(const Type *Ty1,
+ const Type *Ty2) const {
+ if (!Ty1->isInteger() || !Ty2->isInteger())
+ return false;
+
+ return (Ty1->getPrimitiveSizeInBits() > Ty2->getPrimitiveSizeInBits());
+}
+
+bool MSP430TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
+ if (!VT1.isInteger() || !VT2.isInteger())
+ return false;
+
+ return (VT1.getSizeInBits() > VT2.getSizeInBits());
+}
+
+bool MSP430TargetLowering::isZExtFree(const Type *Ty1, const Type *Ty2) const {
+ // MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
+ return 0 && Ty1->isInteger(8) && Ty2->isInteger(16);
+}
+
+bool MSP430TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
+ // MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
+ return 0 && VT1 == MVT::i8 && VT2 == MVT::i16;
+}
+
//===----------------------------------------------------------------------===//
// Other Lowering Code
//===----------------------------------------------------------------------===//