implement legalization of truncates whose results and sources need to be
truncated, e.g. (truncate:i8 something:i16) on a 32 or 64-bit RISC.
llvm-svn: 19879
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 32cf597..e435bd6 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1035,10 +1035,13 @@
if (Result.getValueType() > NVT) // Truncate to NVT instead of VT
Result = DAG.getNode(ISD::TRUNCATE, NVT, Result);
break;
+ case Promote:
+ // The truncation is not required, because we don't guarantee anything
+ // about high bits anyway.
+ Result = PromoteOp(Node->getOperand(0));
+ break;
case Expand:
assert(0 && "Cannot handle expand yet");
- case Promote:
- assert(0 && "Cannot handle promote-promote yet");
}
break;
case ISD::SIGN_EXTEND: