1 files changed, 59 insertions, 0 deletions
diff --git a/sysdeps/aarch64/fpu/coshf_sve.c b/sysdeps/aarch64/fpu/coshf_sve.c
new file mode 100644
index 0000000000..e5d8a299c6
--- /dev/null
+++ b/sysdeps/aarch64/fpu/coshf_sve.c
@@ -0,0 +1,59 @@
+/* Single-precision vector (SVE) cosh 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/>.  */
+
+#include "sv_math.h"
+#include "sv_expf_inline.h"
+
+static const struct data
+{
+  struct sv_expf_data expf_consts;
+  uint32_t special_bound;
+} data = {
+  .expf_consts = SV_EXPF_DATA,
+  /* 0x1.5a92d8p+6: expf overflows above this, so have to use special case.  */
+  .special_bound = 0x42ad496c,
+};
+
+static svfloat32_t NOINLINE
+special_case (svfloat32_t x, svfloat32_t y, svbool_t pg)
+{
+  return sv_call_f32 (coshf, x, y, pg);
+}
+
+/* Single-precision vector cosh, using vector expf.
+   Maximum error is 1.89 ULP:
+   _ZGVsMxv_coshf (-0x1.65898cp+6) got 0x1.f00aep+127
+				  want 0x1.f00adcp+127.  */
+svfloat32_t SV_NAME_F1 (cosh) (svfloat32_t x, svbool_t pg)
+{
+  const struct data *d = ptr_barrier (&data);
+
+  svfloat32_t ax = svabs_x (pg, x);
+  svbool_t special = svcmpge (pg, svreinterpret_u32 (ax), d->special_bound);
+
+  /* Calculate cosh by exp(x) / 2 + exp(-x) / 2.  */
+  svfloat32_t t = expf_inline (ax, pg, &d->expf_consts);
+  svfloat32_t half_t = svmul_x (pg, t, 0.5);
+  svfloat32_t half_over_t = svdivr_x (pg, t, 0.5);
+
+  if (__glibc_unlikely (svptest_any (pg, special)))
+    return special_case (x, svadd_x (pg, half_t, half_over_t), special);
+
+  return svadd_x (pg, half_t, half_over_t);
+}