AArch64: simplify illegal vector check. NFC.

Use a utility function to check whether the number of elements is a power of 2
and drop the redundant upper limit (a 128-bit vector with more than 16 elements
would have each element < 8 bits, not possible).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@268422 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index db7c1f0e7ee91e73e59fbfb6a425918b2ab735e0..0777ba46c91009f0401665bd69a8afab8a4f06c8 100644 (file)
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -4614,7 +4614,7 @@ bool AArch64ABIInfo::isIllegalVectorType(QualType Ty) const {
     unsigned NumElements = VT->getNumElements();
     uint64_t Size = getContext().getTypeSize(VT);
     // NumElements should be power of 2 between 1 and 16.
-    if ((NumElements & (NumElements - 1)) != 0 || NumElements > 16)
+    if (!llvm::isPowerOf2_32(NumElements))
       return true;
     return Size != 64 && (Size != 128 || NumElements == 1);
   }