when legalizing extremely wide shifts, make sure that

the shift amounts are in a suitably wide type so that
we don't generate out of range constant shift amounts.

This fixes PR9028.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125458 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index d9faea1247..696cd24f0a 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -2426,11 +2426,11 @@ void SelectionDAGBuilder::visitShift(const User &I, unsigned Opcode) {
   SDValue Op2 = getValue(I.getOperand(1));
   
   MVT ShiftTy = TLI.getShiftAmountTy();
-  unsigned ShiftSize = ShiftTy.getSizeInBits();
-  unsigned Op2Size = Op2.getValueType().getSizeInBits();
   
   // Coerce the shift amount to the right type if we can.
   if (!I.getType()->isVectorTy() && Op2.getValueType() != ShiftTy) {
+    unsigned ShiftSize = ShiftTy.getSizeInBits();
+    unsigned Op2Size = Op2.getValueType().getSizeInBits();
     DebugLoc DL = getCurDebugLoc();
     
     // If the operand is smaller than the shift count type, promote it.