[X86][SSE] LowerINSERT_VECTOR_ELT - ensure insertion index correctness. NFCI.

Assert that the insertion index is in range and use uint64_t for the index to fix MSVC/cppcheck truncation warning.

llvm-svn: 365025

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 6050b92..53890af 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -17094,7 +17094,8 @@ SDValue X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
   if (!isa<ConstantSDNode>(N2))
     return SDValue();
   auto *N2C = cast<ConstantSDNode>(N2);
-  unsigned IdxVal = N2C->getZExtValue();
+  assert(N2C->getAPIntValue().ult(NumElts) && "Out of range element index");
+  uint64_t IdxVal = N2C->getZExtValue();
 
   bool IsZeroElt = X86::isZeroNode(N1);
   bool IsAllOnesElt = VT.isInteger() && llvm::isAllOnesConstant(N1);