1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/aarch64/fpu/sinhf_sve.c b/sysdeps/aarch64/fpu/sinhf_sve.c
new file mode 100644
index 0000000000..6c204b57a2
--- /dev/null
+++ b/sysdeps/aarch64/fpu/sinhf_sve.c
@@ -0,0 +1,67 @@
+/* Single-precision vector (SVE) sinh 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_expm1f_inline.h"
+#include "sv_math.h"
+
+static const struct data
+{
+  struct sv_expm1f_data expm1f_consts;
+  uint32_t halff, large_bound;
+} data = {
+  .expm1f_consts = SV_EXPM1F_DATA,
+  .halff = 0x3f000000,
+  /* 0x1.61814ep+6, above which expm1f helper overflows.  */
+  .large_bound = 0x42b0c0a7,
+};
+
+static svfloat32_t NOINLINE
+special_case (svfloat32_t x, svfloat32_t y, svbool_t pg)
+{
+  return sv_call_f32 (sinhf, x, y, pg);
+}
+
+/* Approximation for SVE single-precision sinh(x) using expm1.
+   sinh(x) = (exp(x) - exp(-x)) / 2.
+   The maximum error is 2.26 ULP:
+   _ZGVsMxv_sinhf (0x1.e34a9ep-4) got 0x1.e469ep-4
+				 want 0x1.e469e4p-4.  */
+svfloat32_t SV_NAME_F1 (sinh) (svfloat32_t x, const svbool_t pg)
+{
+  const struct data *d = ptr_barrier (&data);
+  svfloat32_t ax = svabs_x (pg, x);
+  svuint32_t sign
+      = sveor_x (pg, svreinterpret_u32 (x), svreinterpret_u32 (ax));
+  svfloat32_t halfsign = svreinterpret_f32 (svorr_x (pg, sign, d->halff));
+
+  svbool_t special = svcmpge (pg, svreinterpret_u32 (ax), d->large_bound);
+
+  /* Up to the point that expm1f overflows, we can use it to calculate sinhf
+   using a slight rearrangement of the definition of asinh. This allows us to
+   retain acceptable accuracy for very small inputs.  */
+  svfloat32_t t = expm1f_inline (ax, pg, &d->expm1f_consts);
+  t = svadd_x (pg, t, svdiv_x (pg, t, svadd_x (pg, t, 1.0)));
+
+  /* Fall back to the scalar variant for any lanes which would cause
+     expm1f to overflow.  */
+  if (__glibc_unlikely (svptest_any (pg, special)))
+    return special_case (x, svmul_x (pg, t, halfsign), special);
+
+  return svmul_x (pg, t, halfsign);
+}