diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/llvm/CodeGen/ValueTypes.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/llvm/CodeGen/ValueTypes.h b/include/llvm/CodeGen/ValueTypes.h index 06e07f3..9dc4c7b 100644 --- a/include/llvm/CodeGen/ValueTypes.h +++ b/include/llvm/CodeGen/ValueTypes.h @@ -589,7 +589,25 @@ namespace llvm { return getIntegerVT(Context, 1 << Log2_32_Ceil(BitWidth)); } - /// isPow2VectorType - Retuns true if the given vector is a power of 2. + /// getHalfSizedIntegerVT - Finds the smallest simple value type that is + /// greater than or equal to half the width of this EVT. If no simple + /// value type can be found, an extended integer value type of half the + /// size (rounded up) is returned. + EVT getHalfSizedIntegerVT(LLVMContext &Context) const { + assert(isInteger() && !isVector() && "Invalid integer type!"); + unsigned EVTSize = getSizeInBits(); + for (unsigned IntVT = MVT::FIRST_INTEGER_VALUETYPE; + IntVT <= MVT::LAST_INTEGER_VALUETYPE; + ++IntVT) { + EVT HalfVT = EVT((MVT::SimpleValueType)IntVT); + if(HalfVT.getSizeInBits() * 2 >= EVTSize) { + return HalfVT; + } + } + return getIntegerVT(Context, (EVTSize + 1) / 2); + } + + /// isPow2VectorType - Returns true if the given vector is a power of 2. bool isPow2VectorType() const { unsigned NElts = getVectorNumElements(); return !(NElts & (NElts - 1)); |