[libc-commits] [libc] [libc][mathvec] Vectorise exp2f and exp10f (PR #211365)

[via libc-commits]

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@@ -208,9 +209,21 @@ LIBC_INLINE constexpr static simd<T, N> abs(simd<T, N> x) {
   return __builtin_elementwise_abs(x);
 }
 template <typename T, size_t N>
-LIBC_INLINE constexpr static simd<T, N> fma(simd<T, N> x, simd<T, N> y,
-                                            simd<T, N> z) {
-  return __builtin_elementwise_fma(x, y, z);
+LIBC_INLINE constexpr static simd<T, N> multiply_add(simd<T, N> x, simd<T, N> y,
+                                                     simd<T, N> z) {
+#if __has_builtin(__builtin_elementwise_fma)
+#ifdef LIBC_TARGET_CPU_HAS_FMA_FLOAT
+  if constexpr (cpp::is_same_v<T, float>)
+    return __builtin_elementwise_fma(x, y, z);
+#endif // LIBC_TARGET_CPU_HAS_FMA_FLOAT
+
+#ifdef LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+  if constexpr (cpp::is_same_v<T, double>)
+    return __builtin_elementwise_fma(x, y, z);
+#endif // LIBC_TARGET_CPU_HAS_FMA_DOUBLE
+#endif // __has_builtin(__builtin_elementwise_fma)
+
+  return x * y + z;
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lntue wrote:

nit: can you create temporary for `x*y` to make sure compilers won't fuse them?

https://github.com/llvm/llvm-project/pull/211365