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bug #1170: skip calls to memcpy/memmove for empty imput.

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This commit is contained in:
Gael Guennebaud 2016-02-19 22:58:52 +01:00
parent 8d4d85161e
commit b71ee76d8d
1 changed files with 6 additions and 2 deletions
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8
Eigen/src/Core/util/Memory.h
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@ -507,7 +507,12 @@ template<typename T> void smart_copy(const T* start, const T* end, T* target)
template<typename T> struct smart_copy_helper<T,true> {
static inline void run(const T* start, const T* end, T* target)
{ memcpy(target, start, std::ptrdiff_t(end)-std::ptrdiff_t(start)); }
{
std::ptrdiff_t size = std::ptrdiff_t(end)-std::ptrdiff_t(start);
if(size==0) return;
eigen_internal_assert(start!=0 && end!=0 && target!=0);
memcpy(target, start, size);
}
};
template<typename T> struct smart_copy_helper<T,false> {
@ -515,7 +520,6 @@ template<typename T> struct smart_copy_helper<T,false> {
{ std::copy(start, end, target); }
};
/*****************************************************************************
*** Implementation of runtime stack allocation (falling back to malloc) ***
*****************************************************************************/