1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/aarch64/fpu/acoshf_sve.c b/sysdeps/aarch64/fpu/acoshf_sve.c
new file mode 100644
index 0000000000..2110894e62
--- /dev/null
+++ b/sysdeps/aarch64/fpu/acoshf_sve.c
@@ -0,0 +1,49 @@
+/* Single-precision vector (SVE) acosh function
+
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define One 0x3f800000
+#define Thres 0x20000000 /* asuint(0x1p64) - One.  */
+
+#include "sv_log1pf_inline.h"
+
+static svfloat32_t NOINLINE
+special_case (svfloat32_t x, svfloat32_t y, svbool_t special)
+{
+  return sv_call_f32 (acoshf, x, y, special);
+}
+
+/* Single-precision SVE acosh(x) routine. Implements the same algorithm as
+   vector acoshf and log1p.
+
+   Maximum error is 2.78 ULPs:
+   SV_NAME_F1 (acosh) (0x1.01e996p+0) got 0x1.f45b42p-4
+				     want 0x1.f45b3cp-4.  */
+svfloat32_t SV_NAME_F1 (acosh) (svfloat32_t x, const svbool_t pg)
+{
+  svuint32_t ix = svreinterpret_u32 (x);
+  svbool_t special = svcmpge (pg, svsub_x (pg, ix, One), Thres);
+
+  svfloat32_t xm1 = svsub_x (pg, x, 1.0f);
+  svfloat32_t u = svmul_x (pg, xm1, svadd_x (pg, x, 1.0f));
+  svfloat32_t y = sv_log1pf_inline (svadd_x (pg, xm1, svsqrt_x (pg, u)), pg);
+
+  if (__glibc_unlikely (svptest_any (pg, special)))
+    return special_case (x, y, special);
+  return y;
+}