From: Dylan Fleming <Dylan.Fleming@arm.com>
Date: Mon, 19 May 2025 12:39:51 +0000 (+0000)
Subject: AArch64: Implement AdvSIMD and SVE asinpi/f
X-Git-Tag: glibc-2.42~235
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ef2cf44e7784fc357660d80aed72f195485439f;p=thirdparty%2Fglibc.git

AArch64: Implement AdvSIMD and SVE asinpi/f

Implement double and single precision variants of the C23 routine asinpi
for both AdvSIMD and SVE.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
---

diff --git a/bits/libm-simd-decl-stubs.h b/bits/libm-simd-decl-stubs.h
index fa9936b3e8..e05f596459 100644
--- a/bits/libm-simd-decl-stubs.h
+++ b/bits/libm-simd-decl-stubs.h
@@ -384,4 +384,15 @@
 #define __DECL_SIMD_acospif32x
 #define __DECL_SIMD_acospif64x
 #define __DECL_SIMD_acospif128x
+
+#define __DECL_SIMD_asinpi
+#define __DECL_SIMD_asinpif
+#define __DECL_SIMD_asinpil
+#define __DECL_SIMD_asinpif16
+#define __DECL_SIMD_asinpif32
+#define __DECL_SIMD_asinpif64
+#define __DECL_SIMD_asinpif128
+#define __DECL_SIMD_asinpif32x
+#define __DECL_SIMD_asinpif64x
+#define __DECL_SIMD_asinpif128x
 #endif
diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index 0836baadd2..573cec9d49 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -71,6 +71,7 @@ __MATHCALL (acospi,, (_Mdouble_ __x));
 __MATHCALL_VEC (acospi,, (_Mdouble_ __x));
 /* Arc sine of X, divided by pi.  */
 __MATHCALL (asinpi,, (_Mdouble_ __x));
+__MATHCALL_VEC (asinpi,, (_Mdouble_ __x));
 /* Arc tangent of X, divided by pi.  */
 __MATHCALL (atanpi,, (_Mdouble_ __x));
 /* Arc tangent of Y/X, divided by pi.  */
diff --git a/sysdeps/aarch64/fpu/Makefile b/sysdeps/aarch64/fpu/Makefile
index 9d858c64da..e9d5c1ae42 100644
--- a/sysdeps/aarch64/fpu/Makefile
+++ b/sysdeps/aarch64/fpu/Makefile
@@ -3,6 +3,7 @@ libmvec-supported-funcs = acos \
                           acospi \
                           asin \
                           asinh \
+                          asinpi \
                           atan \
                           atanh \
                           atan2 \
diff --git a/sysdeps/aarch64/fpu/Versions b/sysdeps/aarch64/fpu/Versions
index b06c5d2fa3..b9a09f8256 100644
--- a/sysdeps/aarch64/fpu/Versions
+++ b/sysdeps/aarch64/fpu/Versions
@@ -163,5 +163,10 @@ libmvec {
     _ZGVnN4v_acospif;
     _ZGVsMxv_acospi;
     _ZGVsMxv_acospif;
+    _ZGVnN2v_asinpi;
+    _ZGVnN2v_asinpif;
+    _ZGVnN4v_asinpif;
+    _ZGVsMxv_asinpi;
+    _ZGVsMxv_asinpif;
   }
 }
diff --git a/sysdeps/aarch64/fpu/advsimd_f32_protos.h b/sysdeps/aarch64/fpu/advsimd_f32_protos.h
index f260fa2a5c..215a5a19f4 100644
--- a/sysdeps/aarch64/fpu/advsimd_f32_protos.h
+++ b/sysdeps/aarch64/fpu/advsimd_f32_protos.h
@@ -22,6 +22,7 @@ libmvec_hidden_proto (V_NAME_F1(acosh));
 libmvec_hidden_proto (V_NAME_F1(acospi));
 libmvec_hidden_proto (V_NAME_F1(asin));
 libmvec_hidden_proto (V_NAME_F1(asinh));
+libmvec_hidden_proto (V_NAME_F1(asinpi));
 libmvec_hidden_proto (V_NAME_F1(atan));
 libmvec_hidden_proto (V_NAME_F1(atanh));
 libmvec_hidden_proto (V_NAME_F1(cbrt));
diff --git a/sysdeps/aarch64/fpu/asinpi_advsimd.c b/sysdeps/aarch64/fpu/asinpi_advsimd.c
new file mode 100644
index 0000000000..b11f98b8b0
--- /dev/null
+++ b/sysdeps/aarch64/fpu/asinpi_advsimd.c
@@ -0,0 +1,109 @@
+/* Double-Precision vector (Advanced SIMD) inverse sinpi function
+
+   Copyright (C) 2025 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"
+
+static const struct data
+{
+  float64x2_t c0, c2, c4, c6, c8, c10;
+  float64x2_t pi_over_2, inv_pi;
+  uint64x2_t abs_mask;
+  double c1, c3, c5, c7, c9, c11;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))
+     on [ 0x1p-106, 0x1p-2 ], relative error: 0x1.c3d8e169p-57.  */
+  .c0 = V2 (0x1.555555555554ep-3),	  .c1 = 0x1.3333333337233p-4,
+  .c2 = V2 (0x1.6db6db67f6d9fp-5),	  .c3 = 0x1.f1c71fbd29fbbp-6,
+  .c4 = V2 (0x1.6e8b264d467d6p-6),	  .c5 = 0x1.1c5997c357e9dp-6,
+  .c6 = V2 (0x1.c86a22cd9389dp-7),	  .c7 = 0x1.856073c22ebbep-7,
+  .c8 = V2 (0x1.fd1151acb6bedp-8),	  .c9 = 0x1.087182f799c1dp-6,
+  .c10 = V2 (-0x1.6602748120927p-7),	  .c11 = 0x1.cfa0dd1f9478p-6,
+  .pi_over_2 = V2 (0x1.921fb54442d18p+0), .abs_mask = V2 (0x7fffffffffffffff),
+  .inv_pi = V2 (0x1.45f306dc9c883p-2),
+};
+
+/* Double-precision implementation of vector asinpi(x).
+
+   For |x| in [0, 0.5], use an order 11 polynomial P such that the final
+   approximation is an odd polynomial: asin(x) ~ x + x^3 P(x^2).
+   asinpi(x) = asin(x) * 1/pi.
+
+   The largest observed error in this region is 1.63 ulps,
+   _ZGVnN2v_asinpi (0x1.9125919fa617p-19) got 0x1.fec183497ea53p-21
+					 want 0x1.fec183497ea51p-21.
+
+   For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+     asin(x) = pi/2 - (y + y * z * P(z)), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 3.04 ulps,
+   _ZGVnN2v_asinpi (0x1.0479b7bd98553p-1) got 0x1.5beebec797326p-3
+					 want 0x1.5beebec797329p-3.  */
+
+float64x2_t VPCS_ATTR V_NAME_D1 (asinpi) (float64x2_t x)
+{
+  const struct data *d = ptr_barrier (&data);
+  float64x2_t ax = vabsq_f64 (x);
+
+  uint64x2_t a_lt_half = vcaltq_f64 (x, v_f64 (0.5));
+
+  /* Evaluate polynomial Q(x) = y + y * z * P(z) with
+     z = x ^ 2 and y = |x|            , if |x| < 0.5
+     z = (1 - |x|) / 2 and y = sqrt(z), if |x| >= 0.5.  */
+  float64x2_t z2 = vbslq_f64 (a_lt_half, vmulq_f64 (x, x),
+			      vfmsq_n_f64 (v_f64 (0.5), ax, 0.5));
+  float64x2_t z = vbslq_f64 (a_lt_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);
+
+  /* order-11 Estrin.  */
+  float64x2_t c13 = vld1q_f64 (&d->c1);
+  float64x2_t c57 = vld1q_f64 (&d->c5);
+  float64x2_t c911 = vld1q_f64 (&d->c9);
+
+  float64x2_t p01 = vfmaq_laneq_f64 (d->c0, z2, c13, 0);
+  float64x2_t p23 = vfmaq_laneq_f64 (d->c2, z2, c13, 1);
+  float64x2_t p03 = vfmaq_f64 (p01, z4, p23);
+
+  float64x2_t p45 = vfmaq_laneq_f64 (d->c4, z2, c57, 0);
+  float64x2_t p67 = vfmaq_laneq_f64 (d->c6, z2, c57, 1);
+  float64x2_t p47 = vfmaq_f64 (p45, z4, p67);
+
+  float64x2_t p89 = vfmaq_laneq_f64 (d->c8, z2, c911, 0);
+  float64x2_t p1011 = vfmaq_laneq_f64 (d->c10, z2, c911, 1);
+  float64x2_t p811 = vfmaq_f64 (p89, z4, p1011);
+
+  float64x2_t p07 = vfmaq_f64 (p03, z8, p47);
+  float64x2_t p = vfmaq_f64 (p07, z16, p811);
+
+  /* Finalize polynomial: z + z * z2 * P(z2).  */
+  p = vfmaq_f64 (z, vmulq_f64 (z, z2), p);
+
+  /* asin(|x|) = Q(|x|)          , for |x| < 0.5
+	       = pi/2 - 2 Q(|x|), for |x| >= 0.5.  */
+  float64x2_t y = vbslq_f64 (a_lt_half, p, vfmsq_n_f64 (d->pi_over_2, p, 2.0));
+  /* asinpi(|x|) = asin(|x|) /pi.  */
+  y = vmulq_f64 (y, d->inv_pi);
+
+  /* Copy sign.  */
+  return vbslq_f64 (d->abs_mask, y, x);
+}
diff --git a/sysdeps/aarch64/fpu/asinpi_sve.c b/sysdeps/aarch64/fpu/asinpi_sve.c
new file mode 100644
index 0000000000..71ef8cea3b
--- /dev/null
+++ b/sysdeps/aarch64/fpu/asinpi_sve.c
@@ -0,0 +1,107 @@
+/* Double-Precision vector (SVE) inverse sinpi function
+
+   Copyright (C) 2025 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"
+
+static const struct data
+{
+  float64_t c1, c3, c5, c7, c9, c11;
+  float64_t c0, c2, c4, c6, c8, c10;
+  float64_t pi_over_2, inv_pi;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))
+     on [ 0x1p-106, 0x1p-2 ], relative error: 0x1.c3d8e169p-57.  */
+  .c0 = 0x1.555555555554ep-3,	     .c1 = 0x1.3333333337233p-4,
+  .c2 = 0x1.6db6db67f6d9fp-5,	     .c3 = 0x1.f1c71fbd29fbbp-6,
+  .c4 = 0x1.6e8b264d467d6p-6,	     .c5 = 0x1.1c5997c357e9dp-6,
+  .c6 = 0x1.c86a22cd9389dp-7,	     .c7 = 0x1.856073c22ebbep-7,
+  .c8 = 0x1.fd1151acb6bedp-8,	     .c9 = 0x1.087182f799c1dp-6,
+  .c10 = -0x1.6602748120927p-7,	     .c11 = 0x1.cfa0dd1f9478p-6,
+  .pi_over_2 = 0x1.921fb54442d18p+0, .inv_pi = 0x1.45f306dc9c883p-2,
+};
+
+/* Double-precision SVE implementation of vector asinpi(x).
+
+   For |x| in [0, 0.5], use an order 11 polynomial P such that the final
+   approximation is an odd polynomial: asin(x) ~ x + x^3 P(x^2).
+
+   The largest observed error in this region is 1.32 ulp:
+   _ZGVsMxv_asinpi (0x1.fc12356dbdefbp-2) got 0x1.5272e9658ba66p-3
+					 want 0x1.5272e9658ba64p-3
+
+   For |x| in [0.5, 1.0], use same approximation with a change of variable:
+  asin(x) = pi/2 - (y + y * z * P(z)), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 3.48 ulp:
+   _ZGVsMxv_asinpi (0x1.03da0c2295424p-1) got 0x1.5b02b3dcafaefp-3
+					 want 0x1.5b02b3dcafaf2p-3.  */
+svfloat64_t SV_NAME_D1 (asinpi) (svfloat64_t x, const svbool_t pg)
+{
+  const struct data *d = ptr_barrier (&data);
+  svbool_t ptrue = svptrue_b64 ();
+
+  svuint64_t sign = svand_x (pg, svreinterpret_u64 (x), 0x8000000000000000);
+  svfloat64_t ax = svabs_x (pg, x);
+  svbool_t a_ge_half = svacge (pg, x, 0.5);
+
+  /* Evaluate polynomial Q(x) = y + y * z * P(z) with
+     z = x ^ 2 and y = |x|            , if |x| < 0.5
+     z = (1 - |x|) / 2 and y = sqrt(z), if |x| >= 0.5.  */
+  svfloat64_t z2 = svsel (a_ge_half, svmls_x (pg, sv_f64 (0.5), ax, 0.5),
+			  svmul_x (ptrue, x, x));
+  svfloat64_t z = svsqrt_m (ax, a_ge_half, z2);
+
+  /* Use a single polynomial approximation P for both intervals.  */
+  svfloat64_t z3 = svmul_x (pg, z2, z);
+  svfloat64_t z4 = svmul_x (pg, z2, z2);
+  svfloat64_t z8 = svmul_x (pg, z4, z4);
+
+  svfloat64_t c13 = svld1rq (ptrue, &d->c1);
+  svfloat64_t c57 = svld1rq (ptrue, &d->c5);
+  svfloat64_t c911 = svld1rq (ptrue, &d->c9);
+
+  /* Order-11 Estrin scheme.  */
+  svfloat64_t p01 = svmla_lane (sv_f64 (d->c0), z2, c13, 0);
+  svfloat64_t p23 = svmla_lane (sv_f64 (d->c2), z2, c13, 1);
+  svfloat64_t p03 = svmla_x (pg, p01, z4, p23);
+
+  svfloat64_t p45 = svmla_lane (sv_f64 (d->c4), z2, c57, 0);
+  svfloat64_t p67 = svmla_lane (sv_f64 (d->c6), z2, c57, 1);
+  svfloat64_t p47 = svmla_x (pg, p45, z4, p67);
+
+  svfloat64_t p89 = svmla_lane (sv_f64 (d->c8), z2, c911, 0);
+  svfloat64_t p1011 = svmla_lane (sv_f64 (d->c10), z2, c911, 1);
+  svfloat64_t p811 = svmla_x (pg, p89, z4, p1011);
+
+  svfloat64_t p411 = svmla_x (pg, p47, z8, p811);
+  svfloat64_t p = svmla_x (pg, p03, z8, p411);
+
+  /* Finalize polynomial: z + z3 * P(z2).  */
+  p = svmla_x (pg, z, z3, p);
+
+  /* asin(|x|) = Q(|x|)         , for |x| < 0.5
+	       = pi/2 - 2 Q(|x|), for |x| >= 0.5.  */
+  svfloat64_t y = svmad_m (a_ge_half, p, sv_f64 (-2.0), d->pi_over_2);
+
+  /* Reinsert the sign from the argument.  */
+  svfloat64_t inv_pi = svreinterpret_f64 (
+      svorr_x (pg, svreinterpret_u64 (sv_f64 (d->inv_pi)), sign));
+
+  return svmul_x (pg, y, inv_pi);
+}
diff --git a/sysdeps/aarch64/fpu/asinpif_advsimd.c b/sysdeps/aarch64/fpu/asinpif_advsimd.c
new file mode 100644
index 0000000000..1483ea8a06
--- /dev/null
+++ b/sysdeps/aarch64/fpu/asinpif_advsimd.c
@@ -0,0 +1,95 @@
+/* Single-Precision vector (Advanced SIMD) inverse sinpi function
+
+   Copyright (C) 2025 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"
+
+static const struct data
+{
+  float32x4_t c0, c2, c4, inv_pi;
+  float c1, c3, c5, null;
+} data = {
+  /* Coefficients of polynomial P such that asin(x)/pi~ x/pi + x^3 * poly(x^2)
+     on [ 0x1p-126 0x1p-2 ]. rel error: 0x1.ef9f94b1p-33. Generated using
+     iterative approach for minimisation of relative error in Sollya file.  */
+  .c0 = V4 (0x1.b2995ep-5f),	 .c1 = 0x1.8724ep-6f,
+  .c2 = V4 (0x1.d1301ep-7f),	 .c3 = 0x1.446d3cp-7f,
+  .c4 = V4 (0x1.654848p-8f),	 .c5 = 0x1.5fdaa8p-7f,
+  .inv_pi = V4 (0x1.45f306p-2f),
+};
+
+#define AbsMask 0x7fffffff
+
+/* Single-precision implementation of vector asinpi(x).
+
+    For |x| < 0.5, use order 5 polynomial P such that the final
+   approximation is an odd polynomial: asinpif(x) ~ x/pi + x^3 P(x^2).
+
+    The largest observed error in this region is 1.68 ulps,
+      _ZGVnN4v_asinpif (0x1.86e514p-2) got 0x1.fea8c8p-4 want 0x1.fea8ccp-4.
+
+    For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+    asin(x) = pi/2 - (y + y * z * P(z)), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 3.49 ulps,
+   _ZGVnN4v_asinpif(0x1.0d93fep-1) got 0x1.697aap-3 want 0x1.697a9ap-3.  */
+float32x4_t VPCS_ATTR NOINLINE V_NAME_F1 (asinpi) (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));
+
+  float32x4_t ax = vreinterpretq_f32_u32 (ia);
+  uint32x4_t a_lt_half = vcaltq_f32 (x, v_f32 (0.5f));
+
+  /* Evaluate polynomial Q(x) = y/pi + y * z * P(z) with
+     z = x ^ 2 and y = |x|            , if |x| < 0.5
+     z = (1 - |x|) / 2 and y = sqrt(z), if |x| >= 0.5.  */
+  float32x4_t z2 = vbslq_f32 (a_lt_half, vmulq_f32 (x, x),
+			      vfmsq_n_f32 (v_f32 (0.5f), ax, 0.5f));
+  float32x4_t z = vbslq_f32 (a_lt_half, ax, vsqrtq_f32 (z2));
+
+  /* Use a single polynomial approximation P for both intervals.  */
+
+  /* Order-5 Estrin evaluation scheme.  */
+  float32x4_t z4 = vmulq_f32 (z2, z2);
+  float32x4_t z8 = vmulq_f32 (z4, z4);
+  float32x4_t c135 = vld1q_f32 (&d->c1);
+  float32x4_t p01 = vfmaq_laneq_f32 (d->c0, z2, c135, 0);
+  float32x4_t p23 = vfmaq_laneq_f32 (d->c2, z2, c135, 1);
+  float32x4_t p03 = vfmaq_f32 (p01, z4, p23);
+  float32x4_t p45 = vfmaq_laneq_f32 (d->c4, z2, c135, 2);
+  float32x4_t p = vfmaq_f32 (p03, z8, p45);
+  /* Add 1/pi as final coeff.  */
+  p = vfmaq_f32 (d->inv_pi, z2, p);
+
+  /* Finalize polynomial: z * P(z2).  */
+  p = vmulq_f32 (z, p);
+
+  /*  asinpi(|x|) = Q(|x|), for |x| < 0.5
+	       =  1/2 - 2 Q(|x|), for |x| >= 0.5.  */
+  float32x4_t y
+      = vbslq_f32 (a_lt_half, p, vfmsq_n_f32 (v_f32 (0.5f), p, 2.0f));
+
+  /* Copy sign.  */
+  return vbslq_f32 (v_u32 (AbsMask), y, x);
+}
+libmvec_hidden_def (V_NAME_F1 (asinpi))
+HALF_WIDTH_ALIAS_F1 (asinpi)
diff --git a/sysdeps/aarch64/fpu/asinpif_sve.c b/sysdeps/aarch64/fpu/asinpif_sve.c
new file mode 100644
index 0000000000..046b2585c1
--- /dev/null
+++ b/sysdeps/aarch64/fpu/asinpif_sve.c
@@ -0,0 +1,88 @@
+/* Single-Precision vector (SVE) inverse sinpi function
+
+   Copyright (C) 2025 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"
+
+static const struct data
+{
+  float32_t c1, c3, c5;
+  float32_t c0, c2, c4, inv_pi;
+} data = {
+  /* Polynomial approximation of  (asin(sqrt(x)) - sqrt(x)) / (x * sqrt(x))  on
+    [ 0x1p-24 0x1p-2 ] order = 4 rel error: 0x1.00a23bbp-29 .  */
+  .c0 = 0x1.b2995ep-5f,	    .c1 = 0x1.8724ep-6f,  .c2 = 0x1.d1301ep-7f,
+  .c3 = 0x1.446d3cp-7f,	    .c4 = 0x1.654848p-8f, .c5 = 0x1.5fdaa8p-7f,
+  .inv_pi = 0x1.45f306p-2f,
+};
+
+/* Single-precision SVE implementation of vector asin(x).
+
+   For |x| in [0, 0.5], use order 5 polynomial P such that the final
+   approximation is an odd polynomial: asinpi(x) ~ x/pi + x^3 P(x^2).
+
+    The largest observed error in this region is 1.96 ulps:
+    _ZGVsMxv_asinpif (0x1.8e534ep-3) got 0x1.fe6ab4p-5
+				    want 0x1.fe6ab8p-5.
+
+    For |x| in [0.5, 1.0], use same approximation with a change of variable
+
+    asinpi(x) = 1/2 - (y + y * z * P(z)), with  z = (1-x)/2 and y = sqrt(z).
+
+   The largest observed error in this region is 3.46 ulps:
+   _ZGVsMxv_asinpif (0x1.0df892p-1) got 0x1.6a114cp-3
+				   want 0x1.6a1146p-3.  */
+svfloat32_t SV_NAME_F1 (asinpi) (svfloat32_t x, const svbool_t pg)
+{
+  const struct data *d = ptr_barrier (&data);
+  svbool_t ptrue = svptrue_b32 ();
+
+  svuint32_t sign = svand_x (pg, svreinterpret_u32 (x), 0x80000000);
+
+  svfloat32_t ax = svabs_x (pg, x);
+  svbool_t a_ge_half = svacge (pg, x, 0.5);
+
+  /* Evaluate polynomial Q(x) = y + y * z * P(z) with
+   z = x ^ 2 and y = |x|            , if |x| < 0.5
+   z = (1 - |x|) / 2 and y = sqrt(z), if |x| >= 0.5.  */
+  svfloat32_t z2 = svsel (a_ge_half, svmls_x (pg, sv_f32 (0.5), ax, 0.5),
+			  svmul_x (pg, x, x));
+  svfloat32_t z = svsqrt_m (ax, a_ge_half, z2);
+
+  svfloat32_t z4 = svmul_x (ptrue, z2, z2);
+  svfloat32_t c135_two = svld1rq (ptrue, &d->c1);
+
+  /* Order-5 Pairwise Horner evaluation scheme.  */
+  svfloat32_t p01 = svmla_lane (sv_f32 (d->c0), z2, c135_two, 0);
+  svfloat32_t p23 = svmla_lane (sv_f32 (d->c2), z2, c135_two, 1);
+  svfloat32_t p45 = svmla_lane (sv_f32 (d->c4), z2, c135_two, 2);
+
+  svfloat32_t p25 = svmla_x (pg, p23, z4, p45);
+  svfloat32_t p = svmla_x (pg, p01, z4, p25);
+
+  /* Add 1/pi as final coeff.  */
+  p = svmla_x (pg, sv_f32 (d->inv_pi), z2, p);
+  p = svmul_x (pg, p, z);
+
+  /*  asinpi(|x|) = Q(|x|), for |x| < 0.5
+	       =  1/2 - 2 Q(|x|), for |x| >= 0.5.  */
+  svfloat32_t y = svmsb_m (a_ge_half, p, sv_f32 (2.0), 0.5);
+
+  /* Reinsert sign from argument.  */
+  return svreinterpret_f32 (sveor_x (pg, svreinterpret_u32 (y), sign));
+}
diff --git a/sysdeps/aarch64/fpu/bits/math-vector.h b/sysdeps/aarch64/fpu/bits/math-vector.h
index e828300062..a67d565d8a 100644
--- a/sysdeps/aarch64/fpu/bits/math-vector.h
+++ b/sysdeps/aarch64/fpu/bits/math-vector.h
@@ -49,6 +49,10 @@
 # define __DECL_SIMD_asinh __DECL_SIMD_aarch64
 # undef __DECL_SIMD_asinhf
 # define __DECL_SIMD_asinhf __DECL_SIMD_aarch64
+# undef __DECL_SIMD_asinpi
+# define __DECL_SIMD_asinpi __DECL_SIMD_aarch64
+# undef __DECL_SIMD_asinpif
+# define __DECL_SIMD_asinpif __DECL_SIMD_aarch64
 # undef __DECL_SIMD_atan
 # define __DECL_SIMD_atan __DECL_SIMD_aarch64
 # undef __DECL_SIMD_atanf
@@ -185,6 +189,7 @@ __vpcs __f32x4_t _ZGVnN4v_acoshf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_acospif (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_asinf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_asinhf (__f32x4_t);
+__vpcs __f32x4_t _ZGVnN4v_asinpif (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_atanf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_atanhf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_cbrtf (__f32x4_t);
@@ -217,6 +222,7 @@ __vpcs __f64x2_t _ZGVnN2v_acosh (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_acospi (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_asin (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_asinh (__f64x2_t);
+__vpcs __f64x2_t _ZGVnN2v_asinpi (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_atan (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_atanh (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_cbrt (__f64x2_t);
@@ -254,6 +260,7 @@ __sv_f32_t _ZGVsMxv_acoshf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_acospif (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_asinf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_asinhf (__sv_f32_t, __sv_bool_t);
+__sv_f32_t _ZGVsMxv_asinpif (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_atanf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_atanhf (__sv_f32_t, __sv_bool_t);
 __sv_f32_t _ZGVsMxv_cbrtf (__sv_f32_t, __sv_bool_t);
@@ -286,6 +293,7 @@ __sv_f64_t _ZGVsMxv_acosh (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_acospi (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_asin (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_asinh (__sv_f64_t, __sv_bool_t);
+__sv_f64_t _ZGVsMxv_asinpi (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_atan (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_atanh (__sv_f64_t, __sv_bool_t);
 __sv_f64_t _ZGVsMxv_cbrt (__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 6a96e129e6..ab86b7c949 100644
--- a/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
@@ -28,6 +28,7 @@ VPCS_VECTOR_WRAPPER (acosh_advsimd, _ZGVnN2v_acosh)
 VPCS_VECTOR_WRAPPER (acospi_advsimd, _ZGVnN2v_acospi)
 VPCS_VECTOR_WRAPPER (asin_advsimd, _ZGVnN2v_asin)
 VPCS_VECTOR_WRAPPER (asinh_advsimd, _ZGVnN2v_asinh)
+VPCS_VECTOR_WRAPPER (asinpi_advsimd, _ZGVnN2v_asinpi)
 VPCS_VECTOR_WRAPPER (atan_advsimd, _ZGVnN2v_atan)
 VPCS_VECTOR_WRAPPER (atanh_advsimd, _ZGVnN2v_atanh)
 VPCS_VECTOR_WRAPPER_ff (atan2_advsimd, _ZGVnN2vv_atan2)
diff --git a/sysdeps/aarch64/fpu/test-double-sve-wrappers.c b/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
index 101a8dd23a..8cbb1d9aaa 100644
--- a/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
@@ -47,6 +47,7 @@ SVE_VECTOR_WRAPPER (acosh_sve, _ZGVsMxv_acosh)
 SVE_VECTOR_WRAPPER (acospi_sve, _ZGVsMxv_acospi)
 SVE_VECTOR_WRAPPER (asin_sve, _ZGVsMxv_asin)
 SVE_VECTOR_WRAPPER (asinh_sve, _ZGVsMxv_asinh)
+SVE_VECTOR_WRAPPER (asinpi_sve, _ZGVsMxv_asinpi)
 SVE_VECTOR_WRAPPER (atan_sve, _ZGVsMxv_atan)
 SVE_VECTOR_WRAPPER (atanh_sve, _ZGVsMxv_atanh)
 SVE_VECTOR_WRAPPER_ff (atan2_sve, _ZGVsMxvv_atan2)
diff --git a/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c b/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
index 4fa3bd36cb..a77aadbec1 100644
--- a/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
@@ -28,6 +28,7 @@ VPCS_VECTOR_WRAPPER (acoshf_advsimd, _ZGVnN4v_acoshf)
 VPCS_VECTOR_WRAPPER (acospif_advsimd, _ZGVnN4v_acospif)
 VPCS_VECTOR_WRAPPER (asinf_advsimd, _ZGVnN4v_asinf)
 VPCS_VECTOR_WRAPPER (asinhf_advsimd, _ZGVnN4v_asinhf)
+VPCS_VECTOR_WRAPPER (asinpif_advsimd, _ZGVnN4v_asinpif)
 VPCS_VECTOR_WRAPPER (atanf_advsimd, _ZGVnN4v_atanf)
 VPCS_VECTOR_WRAPPER (atanhf_advsimd, _ZGVnN4v_atanhf)
 VPCS_VECTOR_WRAPPER_ff (atan2f_advsimd, _ZGVnN4vv_atan2f)
diff --git a/sysdeps/aarch64/fpu/test-float-sve-wrappers.c b/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
index 0690c7185c..117cd5c41d 100644
--- a/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
@@ -47,6 +47,7 @@ SVE_VECTOR_WRAPPER (acoshf_sve, _ZGVsMxv_acoshf)
 SVE_VECTOR_WRAPPER (acospif_sve, _ZGVsMxv_acospif)
 SVE_VECTOR_WRAPPER (asinf_sve, _ZGVsMxv_asinf)
 SVE_VECTOR_WRAPPER (asinhf_sve, _ZGVsMxv_asinhf)
+SVE_VECTOR_WRAPPER (asinpif_sve, _ZGVsMxv_asinpif)
 SVE_VECTOR_WRAPPER (atanf_sve, _ZGVsMxv_atanf)
 SVE_VECTOR_WRAPPER (atanhf_sve, _ZGVsMxv_atanhf)
 SVE_VECTOR_WRAPPER_ff (atan2f_sve, _ZGVsMxvv_atan2f)
diff --git a/sysdeps/unix/sysv/linux/aarch64/libmvec.abilist b/sysdeps/unix/sysv/linux/aarch64/libmvec.abilist
index 47d48d3506..4ca8e77d49 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libmvec.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libmvec.abilist
@@ -150,6 +150,11 @@ GLIBC_2.41 _ZGVsMxv_tanpi F
 GLIBC_2.41 _ZGVsMxv_tanpif F
 GLIBC_2.42 _ZGVnN2v_acospi F
 GLIBC_2.42 _ZGVnN2v_acospif F
+GLIBC_2.42 _ZGVnN2v_asinpi F
+GLIBC_2.42 _ZGVnN2v_asinpif F
 GLIBC_2.42 _ZGVnN4v_acospif F
+GLIBC_2.42 _ZGVnN4v_asinpif F
 GLIBC_2.42 _ZGVsMxv_acospi F
 GLIBC_2.42 _ZGVsMxv_acospif F
+GLIBC_2.42 _ZGVsMxv_asinpi F
+GLIBC_2.42 _ZGVsMxv_asinpif F