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[libc][math] Add x86-64 sqrt specialization for 80-bit long double. #139203

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Merged
lntue merged 2 commits into from
May 9, 2025
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[libc][math] Add x86-64 sqrt specialization for 80-bit long double. #139203

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[libc][math] Add x86-64 sqrt specialization for 80-bit long double.
lntue May 9, 2025
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lntue May 9, 2025
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8 changes: 8 additions & 0 deletions libc/src/__support/FPUtil/sqrt.h
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Expand Up @@ -35,6 +35,14 @@ template <> LIBC_INLINE double sqrt<double>(double x) {
}
#endif // LIBC_TARGET_CPU_HAS_FPU_DOUBLE

// Use 80-bit long double instruction on x86.
// https://godbolt.org/z/oWEaj6hxK
#ifdef LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80
template <> LIBC_INLINE long double sqrt<long double>(long double x) {
return __builtin_elementwise_sqrt(x);
}
#endif // LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80

} // namespace fputil
} // namespace LIBC_NAMESPACE_DECL

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