On 8/23/07, Joseph S. Myers <[EMAIL PROTECTED]> wrote:
> On Thu, 23 Aug 2007, Ian Lance Taylor wrote:
>
> > I think we should revert the patch, and continue permitting the
> > bitwise operations on vector float.
> >
> > There seem to be solid reasons to permit this, and no very strong ones
> > to prohibit it. We can consider it to be a GNU extension for vectors.
> > Vectors are of course themselves an extension already.
>
> We decided long ago that the extension would be based on what's permitted
> by C++ valarray rather than by a particular CPU's vector intrinsics. So
> unless C++ valarray allows this operation, I think we should leave it
> prohibited
And it is not supported by valarray.
Testcase:
#include <valarray>
using std::valarray;
valarray<float> a, b;
int f(void)
{
a = a | b;
}
----------------------- cut ----------------------
Error messages:
/usr/include/c++/4.0.0/bits/valarray_before.h: In member function '_Tp
std::__bitwise_or::operator()(const _Tp&, const _Tp&) const [with _Tp
= float]':
/usr/include/c++/4.0.0/bits/valarray_before.h:527: instantiated from
'typename std::__fun<_Oper, typename _Arg::value_type>::result_type
std::_BinBase<_Oper, _FirstArg, _SecondArg>::operator[](size_t) const
[with _Oper = std::__bitwise_or, _FirstArg = std::valarray<float>,
_SecondArg = std::valarray<float>]'
/usr/include/c++/4.0.0/bits/valarray_after.h:220: instantiated from
'_Tp std::_Expr<_Clos, _Tp>::operator[](size_t) const [with _Clos =
std::_BinClos<std::__bitwise_or, std::_ValArray, std::_ValArray,
float, float>, _Tp = float]'
/usr/include/c++/4.0.0/bits/valarray_array.tcc:149: instantiated
from 'void std::__valarray_copy(const std::_Expr<_Dom, _Tp>&, size_t,
std::_Array<_Tp>) [with _Tp = float, _Dom =
std::_BinClos<std::__bitwise_or, std::_ValArray, std::_ValArray,
float, float>]'
/usr/include/c++/4.0.0/valarray:696: instantiated from
'std::valarray<_Tp>& std::valarray<_Tp>::operator=(const
std::_Expr<_Dom, _Tp>&) [with _Dom = std::_BinClos<std::__bitwise_or,
std::_ValArray, std::_ValArray, float, float>, _Tp = float]'
t.cc:8: instantiated from here
/usr/include/c++/4.0.0/bits/valarray_before.h:243: error: invalid
operands of types 'const float' and 'const float' to binary
'operator|'
Thanks,
Andrew Pinski
