aarch64: Add vector implementations of acos routines

12 files changed, 436 insertions, 1 deletions

diff --git a/sysdeps/aarch64/fpu/Makefile b/sysdeps/aarch64/fpu/Makefile
index d7c0bd2ed5..606fdd804f 100644
--- a/sysdeps/aarch64/fpu/Makefile
+++ b/sysdeps/aarch64/fpu/Makefile
@@ -1,4 +1,5 @@
-libmvec-supported-funcs = asin \
+libmvec-supported-funcs = acos \
+                          asin \
                           cos \
                           exp \
                           exp10 \
diff --git a/sysdeps/aarch64/fpu/Versions b/sysdeps/aarch64/fpu/Versions
index 0f365a1e2e..1037cd92bd 100644
--- a/sysdeps/aarch64/fpu/Versions
+++ b/sysdeps/aarch64/fpu/Versions
@@ -18,6 +18,10 @@ libmvec {
     _ZGVsMxv_sinf;
   }
   GLIBC_2.39 {
+    _ZGVnN4v_acosf;
+    _ZGVnN2v_acos;
+    _ZGVsMxv_acosf;
+    _ZGVsMxv_acos;
     _ZGVnN4v_asinf;
     _ZGVnN2v_asin;
     _ZGVsMxv_asinf;
diff --git a/sysdeps/aarch64/fpu/acos_advsimd.c b/sysdeps/aarch64/fpu/acos_advsimd.c
new file mode 100644
index 0000000000..3121cf66b1
--- /dev/null
+++ b/sysdeps/aarch64/fpu/acos_advsimd.c
@@ -0,0 +1,122 @@
+/* Double-precision AdvSIMD inverse cos
+
+   Copyright (C) 2023 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 "v_math.h"
+#include "poly_advsimd_f64.h"
+
+static const struct data
+{
+  float64x2_t poly[12];
+  float64x2_t pi, pi_over_2;
+  uint64x2_t abs_mask;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))
+     on [ 0x1p-106, 0x1p-2 ], relative error: 0x1.c3d8e169p-57.  */
+  .poly = { V2 (0x1.555555555554ep-3), V2 (0x1.3333333337233p-4),
+	    V2 (0x1.6db6db67f6d9fp-5), V2 (0x1.f1c71fbd29fbbp-6),
+	    V2 (0x1.6e8b264d467d6p-6), V2 (0x1.1c5997c357e9dp-6),
+	    V2 (0x1.c86a22cd9389dp-7), V2 (0x1.856073c22ebbep-7),
+	    V2 (0x1.fd1151acb6bedp-8), V2 (0x1.087182f799c1dp-6),
+	    V2 (-0x1.6602748120927p-7), V2 (0x1.cfa0dd1f9478p-6), },
+  .pi = V2 (0x1.921fb54442d18p+1),
+  .pi_over_2 = V2 (0x1.921fb54442d18p+0),
+  .abs_mask = V2 (0x7fffffffffffffff),
+};
+
+#define AllMask v_u64 (0xffffffffffffffff)
+#define Oneu (0x3ff0000000000000)
+#define Small (0x3e50000000000000) /* 2^-53.  */
+
+#if WANT_SIMD_EXCEPT
+static float64x2_t VPCS_ATTR NOINLINE
+special_case (float64x2_t x, float64x2_t y, uint64x2_t special)
+{
+  return v_call_f64 (acos, x, y, special);
+}
+#endif
+
+/* Double-precision implementation of vector acos(x).
+
+   For |x| < Small, approximate acos(x) by pi/2 - x. Small = 2^-53 for correct
+   rounding.
+   If WANT_SIMD_EXCEPT = 0, Small = 0 and we proceed with the following
+   approximation.
+
+   For |x| in [Small, 0.5], use an order 11 polynomial P such that the final
+   approximation of asin is an odd polynomial:
+
+     acos(x) ~ pi/2 - (x + x^3 P(x^2)).
+
+   The largest observed error in this region is 1.18 ulps,
+   _ZGVnN2v_acos (0x1.fbab0a7c460f6p-2) got 0x1.0d54d1985c068p+0
+				       want 0x1.0d54d1985c069p+0.
+
+   For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+     acos(x) = y + y * z * P(z), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 1.52 ulps,
+   _ZGVnN2v_acos (0x1.23d362722f591p-1) got 0x1.edbbedf8a7d6ep-1
+				       want 0x1.edbbedf8a7d6cp-1.  */
+float64x2_t VPCS_ATTR V_NAME_D1 (acos) (float64x2_t x)
+{
+  const struct data *d = ptr_barrier (&data);
+
+  float64x2_t ax = vabsq_f64 (x);
+
+#if WANT_SIMD_EXCEPT
+  /* A single comparison for One, Small and QNaN.  */
+  uint64x2_t special
+      = vcgtq_u64 (vsubq_u64 (vreinterpretq_u64_f64 (ax), v_u64 (Small)),
+		   v_u64 (Oneu - Small));
+  if (__glibc_unlikely (v_any_u64 (special)))
+    return special_case (x, x, AllMask);
+#endif
+
+  uint64x2_t a_le_half = vcleq_f64 (ax, v_f64 (0.5));
+
+  /* Evaluate polynomial Q(x) = z + z * z2 * P(z2) with
+     z2 = x ^ 2         and z = |x|     , if |x| < 0.5
+     z2 = (1 - |x|) / 2 and z = sqrt(z2), if |x| >= 0.5.  */
+  float64x2_t z2 = vbslq_f64 (a_le_half, vmulq_f64 (x, x),
+			      vfmaq_f64 (v_f64 (0.5), v_f64 (-0.5), ax));
+  float64x2_t z = vbslq_f64 (a_le_half, ax, vsqrtq_f64 (z2));
+
+  /* Use a single polynomial approximation P for both intervals.  */
+  float64x2_t z4 = vmulq_f64 (z2, z2);
+  float64x2_t z8 = vmulq_f64 (z4, z4);
+  float64x2_t z16 = vmulq_f64 (z8, z8);
+  float64x2_t p = v_estrin_11_f64 (z2, z4, z8, z16, d->poly);
+
+  /* Finalize polynomial: z + z * z2 * P(z2).  */
+  p = vfmaq_f64 (z, vmulq_f64 (z, z2), p);
+
+  /* acos(|x|) = pi/2 - sign(x) * Q(|x|), for  |x| < 0.5
+	       = 2 Q(|x|)               , for  0.5 < x < 1.0
+	       = pi - 2 Q(|x|)          , for -1.0 < x < -0.5.  */
+  float64x2_t y = vbslq_f64 (d->abs_mask, p, x);
+
+  uint64x2_t is_neg = vcltzq_f64 (x);
+  float64x2_t off = vreinterpretq_f64_u64 (
+      vandq_u64 (is_neg, vreinterpretq_u64_f64 (d->pi)));
+  float64x2_t mul = vbslq_f64 (a_le_half, v_f64 (-1.0), v_f64 (2.0));
+  float64x2_t add = vbslq_f64 (a_le_half, d->pi_over_2, off);
+
+  return vfmaq_f64 (add, mul, y);
+}
diff --git a/sysdeps/aarch64/fpu/acos_sve.c b/sysdeps/aarch64/fpu/acos_sve.c
new file mode 100644
index 0000000000..1138a04e73
--- /dev/null
+++ b/sysdeps/aarch64/fpu/acos_sve.c
@@ -0,0 +1,93 @@
+/* Double-precision SVE inverse cos
+
+   Copyright (C) 2023 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 "poly_sve_f64.h"
+
+static const struct data
+{
+  float64_t poly[12];
+  float64_t pi, pi_over_2;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))
+     on [ 0x1p-106, 0x1p-2 ], relative error: 0x1.c3d8e169p-57.  */
+  .poly = { 0x1.555555555554ep-3, 0x1.3333333337233p-4, 0x1.6db6db67f6d9fp-5,
+	    0x1.f1c71fbd29fbbp-6, 0x1.6e8b264d467d6p-6, 0x1.1c5997c357e9dp-6,
+	    0x1.c86a22cd9389dp-7, 0x1.856073c22ebbep-7, 0x1.fd1151acb6bedp-8,
+	    0x1.087182f799c1dp-6, -0x1.6602748120927p-7, 0x1.cfa0dd1f9478p-6, },
+  .pi = 0x1.921fb54442d18p+1,
+  .pi_over_2 = 0x1.921fb54442d18p+0,
+};
+
+/* Double-precision SVE implementation of vector acos(x).
+
+   For |x| in [0, 0.5], use an order 11 polynomial P such that the final
+   approximation of asin is an odd polynomial:
+
+     acos(x) ~ pi/2 - (x + x^3 P(x^2)).
+
+   The largest observed error in this region is 1.18 ulps,
+   _ZGVsMxv_acos (0x1.fbc5fe28ee9e3p-2) got 0x1.0d4d0f55667f6p+0
+				       want 0x1.0d4d0f55667f7p+0.
+
+   For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+     acos(x) = y + y * z * P(z), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 1.52 ulps,
+   _ZGVsMxv_acos (0x1.24024271a500ap-1) got 0x1.ed82df4243f0dp-1
+				       want 0x1.ed82df4243f0bp-1.  */
+svfloat64_t SV_NAME_D1 (acos) (svfloat64_t x, const svbool_t pg)
+{
+  const struct data *d = ptr_barrier (&data);
+
+  svuint64_t sign = svand_x (pg, svreinterpret_u64 (x), 0x8000000000000000);
+  svfloat64_t ax = svabs_x (pg, x);
+
+  svbool_t a_gt_half = svacgt (pg, x, 0.5);
+
+  /* Evaluate polynomial Q(x) = z + z * z2 * P(z2) with
+     z2 = x ^ 2         and z = |x|     , if |x| < 0.5
+     z2 = (1 - |x|) / 2 and z = sqrt(z2), if |x| >= 0.5.  */
+  svfloat64_t z2 = svsel (a_gt_half, svmls_x (pg, sv_f64 (0.5), ax, 0.5),
+			  svmul_x (pg, x, x));
+  svfloat64_t z = svsqrt_m (ax, a_gt_half, z2);
+
+  /* Use a single polynomial approximation P for both intervals.  */
+  svfloat64_t z4 = svmul_x (pg, z2, z2);
+  svfloat64_t z8 = svmul_x (pg, z4, z4);
+  svfloat64_t z16 = svmul_x (pg, z8, z8);
+  svfloat64_t p = sv_estrin_11_f64_x (pg, z2, z4, z8, z16, d->poly);
+
+  /* Finalize polynomial: z + z * z2 * P(z2).  */
+  p = svmla_x (pg, z, svmul_x (pg, z, z2), p);
+
+  /* acos(|x|) = pi/2 - sign(x) * Q(|x|), for  |x| < 0.5
+	       = 2 Q(|x|)               , for  0.5 < x < 1.0
+	       = pi - 2 Q(|x|)          , for -1.0 < x < -0.5.  */
+  svfloat64_t y
+      = svreinterpret_f64 (svorr_x (pg, svreinterpret_u64 (p), sign));
+
+  svbool_t is_neg = svcmplt (pg, x, 0.0);
+  svfloat64_t off = svdup_f64_z (is_neg, d->pi);
+  svfloat64_t mul = svsel (a_gt_half, sv_f64 (2.0), sv_f64 (-1.0));
+  svfloat64_t add = svsel (a_gt_half, off, sv_f64 (d->pi_over_2));
+
+  return svmla_x (pg, add, mul, y);
+}
diff --git a/sysdeps/aarch64/fpu/acosf_advsimd.c b/sysdeps/aarch64/fpu/acosf_advsimd.c
new file mode 100644
index 0000000000..7d39e9b805
--- /dev/null
+++ b/sysdeps/aarch64/fpu/acosf_advsimd.c
@@ -0,0 +1,113 @@
+/* Single-precision AdvSIMD inverse cos
+
+   Copyright (C) 2023 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 "v_math.h"
+#include "poly_advsimd_f32.h"
+
+static const struct data
+{
+  float32x4_t poly[5];
+  float32x4_t pi_over_2f, pif;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))  on
+     [ 0x1p-24 0x1p-2 ] order = 4 rel error: 0x1.00a23bbp-29 .  */
+  .poly = { V4 (0x1.55555ep-3), V4 (0x1.33261ap-4), V4 (0x1.70d7dcp-5),
+	    V4 (0x1.b059dp-6), V4 (0x1.3af7d8p-5) },
+  .pi_over_2f = V4 (0x1.921fb6p+0f),
+  .pif = V4 (0x1.921fb6p+1f),
+};
+
+#define AbsMask 0x7fffffff
+#define Half 0x3f000000
+#define One 0x3f800000
+#define Small 0x32800000 /* 2^-26.  */
+
+#if WANT_SIMD_EXCEPT
+static float32x4_t VPCS_ATTR NOINLINE
+special_case (float32x4_t x, float32x4_t y, uint32x4_t special)
+{
+  return v_call_f32 (acosf, x, y, special);
+}
+#endif
+
+/* Single-precision implementation of vector acos(x).
+
+   For |x| < Small, approximate acos(x) by pi/2 - x. Small = 2^-26 for correct
+   rounding.
+   If WANT_SIMD_EXCEPT = 0, Small = 0 and we proceed with the following
+   approximation.
+
+   For |x| in [Small, 0.5], use order 4 polynomial P such that the final
+   approximation of asin is an odd polynomial:
+
+     acos(x) ~ pi/2 - (x + x^3 P(x^2)).
+
+    The largest observed error in this region is 1.26 ulps,
+      _ZGVnN4v_acosf (0x1.843bfcp-2) got 0x1.2e934cp+0 want 0x1.2e934ap+0.
+
+    For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+      acos(x) = y + y * z * P(z), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 1.32 ulps,
+   _ZGVnN4v_acosf (0x1.15ba56p-1) got 0x1.feb33p-1
+			   want 0x1.feb32ep-1.  */
+float32x4_t VPCS_ATTR V_NAME_F1 (acos) (float32x4_t x)
+{
+  const struct data *d = ptr_barrier (&data);
+
+  uint32x4_t ix = vreinterpretq_u32_f32 (x);
+  uint32x4_t ia = vandq_u32 (ix, v_u32 (AbsMask));
+
+#if WANT_SIMD_EXCEPT
+  /* A single comparison for One, Small and QNaN.  */
+  uint32x4_t special
+      = vcgtq_u32 (vsubq_u32 (ia, v_u32 (Small)), v_u32 (One - Small));
+  if (__glibc_unlikely (v_any_u32 (special)))
+    return special_case (x, x, v_u32 (0xffffffff));
+#endif
+
+  float32x4_t ax = vreinterpretq_f32_u32 (ia);
+  uint32x4_t a_le_half = vcleq_u32 (ia, v_u32 (Half));
+
+  /* Evaluate polynomial Q(x) = z + z * z2 * P(z2) with
+     z2 = x ^ 2         and z = |x|     , if |x| < 0.5
+     z2 = (1 - |x|) / 2 and z = sqrt(z2), if |x| >= 0.5.  */
+  float32x4_t z2 = vbslq_f32 (a_le_half, vmulq_f32 (x, x),
+			      vfmsq_n_f32 (v_f32 (0.5), ax, 0.5));
+  float32x4_t z = vbslq_f32 (a_le_half, ax, vsqrtq_f32 (z2));
+
+  /* Use a single polynomial approximation P for both intervals.  */
+  float32x4_t p = v_horner_4_f32 (z2, d->poly);
+  /* Finalize polynomial: z + z * z2 * P(z2).  */
+  p = vfmaq_f32 (z, vmulq_f32 (z, z2), p);
+
+  /* acos(|x|) = pi/2 - sign(x) * Q(|x|), for  |x| < 0.5
+	       = 2 Q(|x|)               , for  0.5 < x < 1.0
+	       = pi - 2 Q(|x|)          , for -1.0 < x < -0.5.  */
+  float32x4_t y = vbslq_f32 (v_u32 (AbsMask), p, x);
+
+  uint32x4_t is_neg = vcltzq_f32 (x);
+  float32x4_t off = vreinterpretq_f32_u32 (
+      vandq_u32 (vreinterpretq_u32_f32 (d->pif), is_neg));
+  float32x4_t mul = vbslq_f32 (a_le_half, v_f32 (-1.0), v_f32 (2.0));
+  float32x4_t add = vbslq_f32 (a_le_half, d->pi_over_2f, off);
+
+  return vfmaq_f32 (add, mul, y);
+}
diff --git a/sysdeps/aarch64/fpu/acosf_sve.c b/sysdeps/aarch64/fpu/acosf_sve.c
new file mode 100644
index 0000000000..44253fa999
--- /dev/null
+++ b/sysdeps/aarch64/fpu/acosf_sve.c
@@ -0,0 +1,86 @@
+/* Single-precision SVE inverse cos
+
+   Copyright (C) 2023 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 "poly_sve_f32.h"
+
+static const struct data
+{
+  float32_t poly[5];
+  float32_t pi, pi_over_2;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))  on
+     [ 0x1p-24 0x1p-2 ] order = 4 rel error: 0x1.00a23bbp-29 .  */
+  .poly = { 0x1.55555ep-3, 0x1.33261ap-4, 0x1.70d7dcp-5, 0x1.b059dp-6,
+	    0x1.3af7d8p-5, },
+  .pi = 0x1.921fb6p+1f,
+  .pi_over_2 = 0x1.921fb6p+0f,
+};
+
+/* Single-precision SVE implementation of vector acos(x).
+
+   For |x| in [0, 0.5], use order 4 polynomial P such that the final
+   approximation of asin is an odd polynomial:
+
+     acos(x) ~ pi/2 - (x + x^3 P(x^2)).
+
+    The largest observed error in this region is 1.16 ulps,
+      _ZGVsMxv_acosf(0x1.ffbeccp-2) got 0x1.0c27f8p+0
+				   want 0x1.0c27f6p+0.
+
+    For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+      acos(x) = y + y * z * P(z), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 1.32 ulps,
+   _ZGVsMxv_acosf (0x1.15ba56p-1) got 0x1.feb33p-1
+				 want 0x1.feb32ep-1.  */
+svfloat32_t SV_NAME_F1 (acos) (svfloat32_t x, const svbool_t pg)
+{
+  const struct data *d = ptr_barrier (&data);
+
+  svuint32_t sign = svand_x (pg, svreinterpret_u32 (x), 0x80000000);
+  svfloat32_t ax = svabs_x (pg, x);
+  svbool_t a_gt_half = svacgt (pg, x, 0.5);
+
+  /* Evaluate polynomial Q(x) = z + z * z2 * P(z2) with
+     z2 = x ^ 2         and z = |x|     , if |x| < 0.5
+     z2 = (1 - |x|) / 2 and z = sqrt(z2), if |x| >= 0.5.  */
+  svfloat32_t z2 = svsel (a_gt_half, svmls_x (pg, sv_f32 (0.5), ax, 0.5),
+			  svmul_x (pg, x, x));
+  svfloat32_t z = svsqrt_m (ax, a_gt_half, z2);
+
+  /* Use a single polynomial approximation P for both intervals.  */
+  svfloat32_t p = sv_horner_4_f32_x (pg, z2, d->poly);
+  /* Finalize polynomial: z + z * z2 * P(z2).  */
+  p = svmla_x (pg, z, svmul_x (pg, z, z2), p);
+
+  /* acos(|x|) = pi/2 - sign(x) * Q(|x|), for  |x| < 0.5
+	       = 2 Q(|x|)               , for  0.5 < x < 1.0
+	       = pi - 2 Q(|x|)          , for -1.0 < x < -0.5.  */
+  svfloat32_t y
+      = svreinterpret_f32 (svorr_x (pg, svreinterpret_u32 (p), sign));
+
+  svbool_t is_neg = svcmplt (pg, x, 0.0);
+  svfloat32_t off = svdup_f32_z (is_neg, d->pi);
+  svfloat32_t mul = svsel (a_gt_half, sv_f32 (2.0), sv_f32 (-1.0));
+  svfloat32_t add = svsel (a_gt_half, off, sv_f32 (d->pi_over_2));
+
+  return svmla_x (pg, add, mul, y);
+}
diff --git a/sysdeps/aarch64/fpu/bits/math-vector.h b/sysdeps/aarch64/fpu/bits/math-vector.h
index 03778faf96..f313993d70 100644
--- a/sysdeps/aarch64/fpu/bits/math-vector.h
+++ b/sysdeps/aarch64/fpu/bits/math-vector.h
@@ -49,6 +49,7 @@ typedef __SVBool_t __sv_bool_t;
 
 #  define __vpcs __attribute__ ((__aarch64_vector_pcs__))
 
+__vpcs __f32x4_t _ZGVnN4v_acosf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_asinf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_cosf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_expf (__f32x4_t);
@@ -60,6 +61,7 @@ __vpcs __f32x4_t _ZGVnN4v_log2f (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_sinf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_tanf (__f32x4_t);
 
+__vpcs __f64x2_t _ZGVnN2v_acos (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_asin (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_cos (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_exp (__f64x2_t);
@@ -76,6 +78,7 @@ __vpcs __f64x2_t _ZGVnN2v_tan (__f64x2_t);
 
 #ifdef __SVE_VEC_MATH_SUPPORTED
 
+__sv_f32_t _ZGVsMxv_acosf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_asinf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_cosf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_expf (__sv_f32_t, __sv_bool_t);
@@ -87,6 +90,7 @@ __sv_f32_t _ZGVsMxv_log2f (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_sinf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_tanf (__sv_f32_t, __sv_bool_t);
 
+__sv_f64_t _ZGVsMxv_acos (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_asin (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_cos (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_exp (__sv_f64_t, __sv_bool_t);
diff --git a/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c b/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
index b5ccd6b1cc..5a0cbf743b 100644
--- a/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
@@ -23,6 +23,7 @@
 
 #define VEC_TYPE float64x2_t
 
+VPCS_VECTOR_WRAPPER (acos_advsimd, _ZGVnN2v_acos)
 VPCS_VECTOR_WRAPPER (asin_advsimd, _ZGVnN2v_asin)
 VPCS_VECTOR_WRAPPER (cos_advsimd, _ZGVnN2v_cos)
 VPCS_VECTOR_WRAPPER (exp_advsimd, _ZGVnN2v_exp)
diff --git a/sysdeps/aarch64/fpu/test-double-sve-wrappers.c b/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
index fc3b20f421..bd89ff6133 100644
--- a/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
@@ -32,6 +32,7 @@
     return svlastb_f64 (svptrue_b64 (), mr);                                  \
   }
 
+SVE_VECTOR_WRAPPER (acos_sve, _ZGVsMxv_acos)
 SVE_VECTOR_WRAPPER (asin_sve, _ZGVsMxv_asin)
 SVE_VECTOR_WRAPPER (cos_sve, _ZGVsMxv_cos)
 SVE_VECTOR_WRAPPER (exp_sve, _ZGVsMxv_exp)
diff --git a/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c b/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
index 0a36aa91f5..3fafca7557 100644
--- a/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
@@ -23,6 +23,7 @@
 
 #define VEC_TYPE float32x4_t
 
+VPCS_VECTOR_WRAPPER (acosf_advsimd, _ZGVnN4v_acosf)
 VPCS_VECTOR_WRAPPER (asinf_advsimd, _ZGVnN4v_asinf)
 VPCS_VECTOR_WRAPPER (cosf_advsimd, _ZGVnN4v_cosf)
 VPCS_VECTOR_WRAPPER (expf_advsimd, _ZGVnN4v_expf)
diff --git a/sysdeps/aarch64/fpu/test-float-sve-wrappers.c b/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
index f7e4882c7a..b4ec9f777b 100644
--- a/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
@@ -32,6 +32,7 @@
     return svlastb_f32 (svptrue_b32 (), mr);                                  \
   }
 
+SVE_VECTOR_WRAPPER (acosf_sve, _ZGVsMxv_acosf)
 SVE_VECTOR_WRAPPER (asinf_sve, _ZGVsMxv_asinf)
 SVE_VECTOR_WRAPPER (cosf_sve, _ZGVsMxv_cosf)
 SVE_VECTOR_WRAPPER (expf_sve, _ZGVsMxv_expf)
diff --git a/sysdeps/aarch64/libm-test-ulps b/sysdeps/aarch64/libm-test-ulps
index 1edc0fc343..c2b6f21b9d 100644
--- a/sysdeps/aarch64/libm-test-ulps
+++ b/sysdeps/aarch64/libm-test-ulps
@@ -6,11 +6,19 @@ double: 1
 float: 1
 ldouble: 1
 
+Function: "acos_advsimd":
+double: 1
+float: 1
+
 Function: "acos_downward":
 double: 1
 float: 1
 ldouble: 1
 
+Function: "acos_sve":
+double: 1
+float: 1
+
 Function: "acos_towardzero":
 double: 1
 float: 1