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Fix undefined behavior in PPC load.

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VSX vec_xl is Causing a bunch of test failures and failing `-fsanitize=undefined` with g++.
Removing the instruction allows tests to pass and eliminates the warning.
This commit is contained in:
Antonio Sanchez 2025-03-13 22:23:45 -07:00
parent 0ac1fc52dd
commit 5e8edd2186
1 changed files with 4 additions and 12 deletions
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16
Eigen/src/Core/arch/AltiVec/PacketMath.h
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@ -224,29 +224,25 @@ inline std::ostream & operator <<(std::ostream & s, const Packet4ui & v)
return s;
}
template <typename Packet>
EIGEN_STRONG_INLINE Packet pload_common(const __UNPACK_TYPE__(Packet)* from)
template <typename Packet, typename Scalar>
EIGEN_STRONG_INLINE Packet pload_common(const Scalar* from)
{
// some versions of GCC throw "unused-but-set-parameter".
// ignoring these warnings for now.
EIGEN_UNUSED_VARIABLE(from);
EIGEN_DEBUG_ALIGNED_LOAD
#ifdef __VSX__
return vec_xl(0, const_cast<__UNPACK_TYPE__(Packet)*>(from));
#else
return vec_ld(0, from);
#endif
}
// Need to define them first or we get specialization after instantiation errors
template<> EIGEN_STRONG_INLINE Packet4f pload<Packet4f>(const float* from)
{
return pload_common<Packet4f>(from);
return pload_common<Packet4f, float>(from);
}
template<> EIGEN_STRONG_INLINE Packet4i pload<Packet4i>(const int* from)
{
return pload_common<Packet4i>(from);
return pload_common<Packet4i, int>(from);
}
template <typename Packet>
@ -455,15 +451,11 @@ template<> EIGEN_STRONG_INLINE Packet4f pfloor<Packet4f>(const Packet4f& a) { re
template<typename Packet> EIGEN_STRONG_INLINE Packet ploadu_common(const __UNPACK_TYPE__(Packet)* from)
{
EIGEN_DEBUG_UNALIGNED_LOAD
#ifdef __VSX__
return vec_xl(0, const_cast<__UNPACK_TYPE__(Packet)*>(from));
#else
Packet16uc mask = vec_lvsl(0, from); // create the permute mask
Packet16uc MSQ = vec_ld(0, (unsigned char *)from); // most significant quadword
Packet16uc LSQ = vec_ld(15, (unsigned char *)from); // least significant quadword
//TODO: Add static_cast here
return (Packet) vec_perm(MSQ, LSQ, mask); // align the data
#endif
}
template<> EIGEN_STRONG_INLINE Packet4f ploadu<Packet4f>(const float* from)