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- fix comments on vector type legalization



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192389 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sriram Murali 2013-10-10 20:24:53 +00:00
parent 828c9e73ba
commit 4d91232df1
1 changed files with 4 additions and 2 deletions
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6
include/llvm/Target/TargetLowering.h
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@ -1473,10 +1473,12 @@ public:
if (NumElts == 1)
return LegalizeKind(TypeScalarizeVector, EltVT);
// Try to widen vector elements until a legal type is found.
// Try to widen vector elements until the element type is a power of two and
// promote it to a legal type later on, for example:
// <3 x i8> -> <4 x i8> -> <4 x i32>
if (EltVT.isInteger()) {
// Vectors with a number of elements that is not a power of two are always
// widened, for example <3 x float> -> <4 x float>.
// widened, for example <3 x i8> -> <4 x i8>.
if (!VT.isPow2VectorType()) {
NumElts = (unsigned)NextPowerOf2(NumElts);
EVT NVT = EVT::getVectorVT(Context, EltVT, NumElts);