Intrinsics: add LLVMHalfElementsVectorType constraint

This is like the LLVMMatchType, except the verifier checks that the
second argument is a vector with the same base type and half the
number of elements.

This will be used by the ARM64 backend.

llvm-svn: 205079

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index aa84f230d01..089ad1ca5f2 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -2206,6 +2206,12 @@ bool Verifier::VerifyIntrinsicType(Type *Ty,
 
     return Ty != NewTy;
   }
+  case IITDescriptor::HalfVecArgument:
+    // This may only be used when referring to a previous vector argument.
+    return D.getArgumentNumber() >= ArgTys.size() ||
+           !isa<VectorType>(ArgTys[D.getArgumentNumber()]) ||
+           VectorType::getHalfElementsVectorType(
+                         cast<VectorType>(ArgTys[D.getArgumentNumber()])) != Ty;
   }
   llvm_unreachable("unhandled");
 }