This code:
#include <emmintrin.h>
template<typename vec_t>
void x()
{
vec_t tmp1 = vec_t(); // Works with myvec, causes error with __m128
vec_t tmp2 = {}; // Causes warnings about uninitialized members in
myvec
vec_t tmp3; // This may cause a warning about use of
uninitialized variables if tmp3 is later read-accessed.
}
struct myvec
{
struct tmp
{
float data[2];
} d;
};
void y()
{
x<__m128> ();
x<myvec> ();
}
Produces this error when vec_t is __m128:
tmp.cc:6: error: can't convert between vector values of different size
And this warning when vec_t is myvec:
tmp.cc:7: warning: missing initializer for member 'myvec::d'
It is my understanding that constructor calls should never be treated as syntax
errors. Is there really no way to write this code so that it causes neither a
compile error or a warning?
--
Summary: Inexplicable error message with constructing SIMD values
Product: gcc
Version: 4.4.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bisqwit at iki dot fi
GCC build triplet: x86_64-pc-linux-gnu
GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42743
