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MathExtras: Return the result of find(First|Last)Set in the input type. 

Otherwise ZB_Max returns a wrong result when sizeof(T) > sizeof(size_t).

llvm-svn: 182684
This commit is contained in:
Benjamin Kramer 2013-05-24 22:25:20 +00:00
parent f104a830d4
commit 2ce482e628
1 changed files with 4 additions and 4 deletions
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8
llvm/include/llvm/Support/MathExtras.h
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@ -177,7 +177,7 @@ inline std::size_t countLeadingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
/// valid arguments.
template <typename T>
typename enable_if_c<std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed, std::size_t>::type
!std::numeric_limits<T>::is_signed, T>::type
findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
if (ZB == ZB_Max && Val == 0)
return std::numeric_limits<T>::max();
@ -188,7 +188,7 @@ findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
// Disable signed.
template <typename T>
typename enable_if_c<std::numeric_limits<T>::is_integer &&
std::numeric_limits<T>::is_signed, std::size_t>::type
std::numeric_limits<T>::is_signed, T>::type
findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
/// \brief Get the index of the last set bit starting from the least
@ -200,7 +200,7 @@ findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
/// valid arguments.
template <typename T>
typename enable_if_c<std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed, std::size_t>::type
!std::numeric_limits<T>::is_signed, T>::type
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) {
if (ZB == ZB_Max && Val == 0)
return std::numeric_limits<T>::max();
@ -214,7 +214,7 @@ findLastSet(T Val, ZeroBehavior ZB = ZB_Max) {
// Disable signed.
template <typename T>
typename enable_if_c<std::numeric_limits<T>::is_integer &&
std::numeric_limits<T>::is_signed, std::size_t>::type
std::numeric_limits<T>::is_signed, T>::type
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
/// \brief Macro compressed bit reversal table for 256 bits.