add a helper method
llvm-svn: 30452
diff --git a/llvm/lib/VMCore/Instructions.cpp b/llvm/lib/VMCore/Instructions.cpp
index 393858c..8f3633a 100644
--- a/llvm/lib/VMCore/Instructions.cpp
+++ b/llvm/lib/VMCore/Instructions.cpp
@@ -1151,6 +1151,22 @@
return getOpcode() == Instruction::Shl || getType()->isUnsigned();
}
+//===----------------------------------------------------------------------===//
+// CastInst Class
+//===----------------------------------------------------------------------===//
+
+/// isTruncIntCast - Return true if this is a truncating integer cast
+/// instruction, e.g. a cast from long to uint.
+bool CastInst::isTruncIntCast() const {
+ // The dest type has to be integral, the input has to be integer.
+ if (!getType()->isIntegral() || !getOperand(0)->getType()->isInteger())
+ return false;
+
+ // Has to be large to smaller.
+ return getOperand(0)->getType()->getPrimitiveSizeInBits() >
+ getType()->getPrimitiveSizeInBits();
+}
+
//===----------------------------------------------------------------------===//
// SetCondInst Class