[SystemZ] Fix RNSBG bug introduced by r197802
The zext handling added in r197802 wasn't right for RNSBG. This patch
restricts it to ROSBG, RXSBG and RISBG. (The tests for RISBG were added
in r197802 since RISBG was the motivating example.)
llvm-svn: 198862
diff --git a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
index d95361e..aa4752c 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
@@ -769,15 +769,17 @@
RxSBG.Input = N.getOperand(0);
return true;
- case ISD::ZERO_EXTEND: {
- // Restrict the mask to the extended operand.
- unsigned InnerBitSize = N.getOperand(0).getValueType().getSizeInBits();
- if (!refineRxSBGMask(RxSBG, allOnes(InnerBitSize)))
- return false;
+ case ISD::ZERO_EXTEND:
+ if (RxSBG.Opcode != SystemZ::RNSBG) {
+ // Restrict the mask to the extended operand.
+ unsigned InnerBitSize = N.getOperand(0).getValueType().getSizeInBits();
+ if (!refineRxSBGMask(RxSBG, allOnes(InnerBitSize)))
+ return false;
- RxSBG.Input = N.getOperand(0);
- return true;
- }
+ RxSBG.Input = N.getOperand(0);
+ return true;
+ }
+ // Fall through.
case ISD::SIGN_EXTEND: {
// Check that the extension bits are don't-care (i.e. are masked out