aarch64: Add vector implementations of atan2 routines

13 files changed, 523 insertions, 0 deletions

diff --git a/sysdeps/aarch64/fpu/Makefile b/sysdeps/aarch64/fpu/Makefile
index 5bd77a749d..364efbeac1 100644
--- a/sysdeps/aarch64/fpu/Makefile
+++ b/sysdeps/aarch64/fpu/Makefile
@@ -1,6 +1,7 @@
 libmvec-supported-funcs = acos \
                           asin \
                           atan \
+                          atan2 \
                           cos \
                           exp \
                           exp10 \
diff --git a/sysdeps/aarch64/fpu/Versions b/sysdeps/aarch64/fpu/Versions
index dfc3d2dad3..99492b3d33 100644
--- a/sysdeps/aarch64/fpu/Versions
+++ b/sysdeps/aarch64/fpu/Versions
@@ -30,6 +30,10 @@ libmvec {
     _ZGVnN2v_atan;
     _ZGVsMxv_atanf;
     _ZGVsMxv_atan;
+    _ZGVnN4vv_atan2f;
+    _ZGVnN2vv_atan2;
+    _ZGVsMxvv_atan2f;
+    _ZGVsMxvv_atan2;
     _ZGVnN4v_exp10f;
     _ZGVnN2v_exp10;
     _ZGVsMxv_exp10f;
diff --git a/sysdeps/aarch64/fpu/atan2_advsimd.c b/sysdeps/aarch64/fpu/atan2_advsimd.c
new file mode 100644
index 0000000000..fcc6be0d6c
--- /dev/null
+++ b/sysdeps/aarch64/fpu/atan2_advsimd.c
@@ -0,0 +1,121 @@
+/* Double-precision AdvSIMD atan2
+
+   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 pi_over_2;
+  float64x2_t poly[20];
+} data = {
+  /* Coefficients of polynomial P such that atan(x)~x+x*P(x^2) on
+     the interval [2**-1022, 1.0].  */
+  .poly = { V2 (-0x1.5555555555555p-2),	 V2 (0x1.99999999996c1p-3),
+	    V2 (-0x1.2492492478f88p-3),	 V2 (0x1.c71c71bc3951cp-4),
+	    V2 (-0x1.745d160a7e368p-4),	 V2 (0x1.3b139b6a88ba1p-4),
+	    V2 (-0x1.11100ee084227p-4),	 V2 (0x1.e1d0f9696f63bp-5),
+	    V2 (-0x1.aebfe7b418581p-5),	 V2 (0x1.842dbe9b0d916p-5),
+	    V2 (-0x1.5d30140ae5e99p-5),	 V2 (0x1.338e31eb2fbbcp-5),
+	    V2 (-0x1.00e6eece7de8p-5),	 V2 (0x1.860897b29e5efp-6),
+	    V2 (-0x1.0051381722a59p-6),	 V2 (0x1.14e9dc19a4a4ep-7),
+	    V2 (-0x1.d0062b42fe3bfp-9),	 V2 (0x1.17739e210171ap-10),
+	    V2 (-0x1.ab24da7be7402p-13), V2 (0x1.358851160a528p-16), },
+  .pi_over_2 = V2 (0x1.921fb54442d18p+0),
+};
+
+#define SignMask v_u64 (0x8000000000000000)
+
+/* Special cases i.e. 0, infinity, NaN (fall back to scalar calls).  */
+static float64x2_t VPCS_ATTR NOINLINE
+special_case (float64x2_t y, float64x2_t x, float64x2_t ret, uint64x2_t cmp)
+{
+  return v_call2_f64 (atan2, y, x, ret, cmp);
+}
+
+/* Returns 1 if input is the bit representation of 0, infinity or nan.  */
+static inline uint64x2_t
+zeroinfnan (uint64x2_t i)
+{
+  /* (2 * i - 1) >= (2 * asuint64 (INFINITY) - 1).  */
+  return vcgeq_u64 (vsubq_u64 (vaddq_u64 (i, i), v_u64 (1)),
+		    v_u64 (2 * asuint64 (INFINITY) - 1));
+}
+
+/* Fast implementation of vector atan2.
+   Maximum observed error is 2.8 ulps:
+   _ZGVnN2vv_atan2 (0x1.9651a429a859ap+5, 0x1.953075f4ee26p+5)
+	got 0x1.92d628ab678ccp-1
+       want 0x1.92d628ab678cfp-1.  */
+float64x2_t VPCS_ATTR V_NAME_D2 (atan2) (float64x2_t y, float64x2_t x)
+{
+  const struct data *data_ptr = ptr_barrier (&data);
+
+  uint64x2_t ix = vreinterpretq_u64_f64 (x);
+  uint64x2_t iy = vreinterpretq_u64_f64 (y);
+
+  uint64x2_t special_cases = vorrq_u64 (zeroinfnan (ix), zeroinfnan (iy));
+
+  uint64x2_t sign_x = vandq_u64 (ix, SignMask);
+  uint64x2_t sign_y = vandq_u64 (iy, SignMask);
+  uint64x2_t sign_xy = veorq_u64 (sign_x, sign_y);
+
+  float64x2_t ax = vabsq_f64 (x);
+  float64x2_t ay = vabsq_f64 (y);
+
+  uint64x2_t pred_xlt0 = vcltzq_f64 (x);
+  uint64x2_t pred_aygtax = vcgtq_f64 (ay, ax);
+
+  /* Set up z for call to atan.  */
+  float64x2_t n = vbslq_f64 (pred_aygtax, vnegq_f64 (ax), ay);
+  float64x2_t d = vbslq_f64 (pred_aygtax, ay, ax);
+  float64x2_t z = vdivq_f64 (n, d);
+
+  /* Work out the correct shift.  */
+  float64x2_t shift = vreinterpretq_f64_u64 (
+      vandq_u64 (pred_xlt0, vreinterpretq_u64_f64 (v_f64 (-2.0))));
+  shift = vbslq_f64 (pred_aygtax, vaddq_f64 (shift, v_f64 (1.0)), shift);
+  shift = vmulq_f64 (shift, data_ptr->pi_over_2);
+
+  /* Calculate the polynomial approximation.
+     Use split Estrin scheme for P(z^2) with deg(P)=19. Use split instead of
+     full scheme to avoid underflow in x^16.
+     The order 19 polynomial P approximates
+     (atan(sqrt(x))-sqrt(x))/x^(3/2).  */
+  float64x2_t z2 = vmulq_f64 (z, z);
+  float64x2_t x2 = vmulq_f64 (z2, z2);
+  float64x2_t x4 = vmulq_f64 (x2, x2);
+  float64x2_t x8 = vmulq_f64 (x4, x4);
+  float64x2_t ret
+      = vfmaq_f64 (v_estrin_7_f64 (z2, x2, x4, data_ptr->poly),
+		   v_estrin_11_f64 (z2, x2, x4, x8, data_ptr->poly + 8), x8);
+
+  /* Finalize. y = shift + z + z^3 * P(z^2).  */
+  ret = vfmaq_f64 (z, ret, vmulq_f64 (z2, z));
+  ret = vaddq_f64 (ret, shift);
+
+  /* Account for the sign of x and y.  */
+  ret = vreinterpretq_f64_u64 (
+      veorq_u64 (vreinterpretq_u64_f64 (ret), sign_xy));
+
+  if (__glibc_unlikely (v_any_u64 (special_cases)))
+    return special_case (y, x, ret, special_cases);
+
+  return ret;
+}
diff --git a/sysdeps/aarch64/fpu/atan2_sve.c b/sysdeps/aarch64/fpu/atan2_sve.c
new file mode 100644
index 0000000000..6dbc2f3769
--- /dev/null
+++ b/sysdeps/aarch64/fpu/atan2_sve.c
@@ -0,0 +1,118 @@
+/* Double-precision SVE atan2
+
+   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[20];
+  float64_t pi_over_2;
+} data = {
+  /* Coefficients of polynomial P such that atan(x)~x+x*P(x^2) on
+     [2**-1022, 1.0].  */
+  .poly = { -0x1.5555555555555p-2,  0x1.99999999996c1p-3, -0x1.2492492478f88p-3,
+            0x1.c71c71bc3951cp-4,   -0x1.745d160a7e368p-4, 0x1.3b139b6a88ba1p-4,
+            -0x1.11100ee084227p-4,  0x1.e1d0f9696f63bp-5, -0x1.aebfe7b418581p-5,
+            0x1.842dbe9b0d916p-5,   -0x1.5d30140ae5e99p-5, 0x1.338e31eb2fbbcp-5,
+            -0x1.00e6eece7de8p-5,   0x1.860897b29e5efp-6, -0x1.0051381722a59p-6,
+            0x1.14e9dc19a4a4ep-7,  -0x1.d0062b42fe3bfp-9, 0x1.17739e210171ap-10,
+            -0x1.ab24da7be7402p-13, 0x1.358851160a528p-16, },
+  .pi_over_2 = 0x1.921fb54442d18p+0,
+};
+
+/* Useful constants.  */
+#define SignMask sv_u64 (0x8000000000000000)
+
+/* Special cases i.e. 0, infinity, nan (fall back to scalar calls).  */
+static svfloat64_t NOINLINE
+special_case (svfloat64_t y, svfloat64_t x, svfloat64_t ret,
+	      const svbool_t cmp)
+{
+  return sv_call2_f64 (atan2, y, x, ret, cmp);
+}
+
+/* Returns a predicate indicating true if the input is the bit representation
+   of 0, infinity or nan.  */
+static inline svbool_t
+zeroinfnan (svuint64_t i, const svbool_t pg)
+{
+  return svcmpge (pg, svsub_x (pg, svlsl_x (pg, i, 1), 1),
+		  sv_u64 (2 * asuint64 (INFINITY) - 1));
+}
+
+/* Fast implementation of SVE atan2. Errors are greatest when y and
+   x are reasonably close together. The greatest observed error is 2.28 ULP:
+   _ZGVsMxvv_atan2 (-0x1.5915b1498e82fp+732, 0x1.54d11ef838826p+732)
+   got -0x1.954f42f1fa841p-1 want -0x1.954f42f1fa843p-1.  */
+svfloat64_t SV_NAME_D2 (atan2) (svfloat64_t y, svfloat64_t x, const svbool_t pg)
+{
+  const struct data *data_ptr = ptr_barrier (&data);
+
+  svuint64_t ix = svreinterpret_u64 (x);
+  svuint64_t iy = svreinterpret_u64 (y);
+
+  svbool_t cmp_x = zeroinfnan (ix, pg);
+  svbool_t cmp_y = zeroinfnan (iy, pg);
+  svbool_t cmp_xy = svorr_z (pg, cmp_x, cmp_y);
+
+  svuint64_t sign_x = svand_x (pg, ix, SignMask);
+  svuint64_t sign_y = svand_x (pg, iy, SignMask);
+  svuint64_t sign_xy = sveor_x (pg, sign_x, sign_y);
+
+  svfloat64_t ax = svabs_x (pg, x);
+  svfloat64_t ay = svabs_x (pg, y);
+
+  svbool_t pred_xlt0 = svcmplt (pg, x, 0.0);
+  svbool_t pred_aygtax = svcmpgt (pg, ay, ax);
+
+  /* Set up z for call to atan.  */
+  svfloat64_t n = svsel (pred_aygtax, svneg_x (pg, ax), ay);
+  svfloat64_t d = svsel (pred_aygtax, ay, ax);
+  svfloat64_t z = svdiv_x (pg, n, d);
+
+  /* Work out the correct shift.  */
+  svfloat64_t shift = svsel (pred_xlt0, sv_f64 (-2.0), sv_f64 (0.0));
+  shift = svsel (pred_aygtax, svadd_x (pg, shift, 1.0), shift);
+  shift = svmul_x (pg, shift, data_ptr->pi_over_2);
+
+  /* Use split Estrin scheme for P(z^2) with deg(P)=19.  */
+  svfloat64_t z2 = svmul_x (pg, z, z);
+  svfloat64_t x2 = svmul_x (pg, z2, z2);
+  svfloat64_t x4 = svmul_x (pg, x2, x2);
+  svfloat64_t x8 = svmul_x (pg, x4, x4);
+
+  svfloat64_t ret = svmla_x (
+      pg, sv_estrin_7_f64_x (pg, z2, x2, x4, data_ptr->poly),
+      sv_estrin_11_f64_x (pg, z2, x2, x4, x8, data_ptr->poly + 8), x8);
+
+  /* y = shift + z + z^3 * P(z^2).  */
+  svfloat64_t z3 = svmul_x (pg, z2, z);
+  ret = svmla_x (pg, z, z3, ret);
+
+  ret = svadd_m (pg, ret, shift);
+
+  /* Account for the sign of x and y.  */
+  ret = svreinterpret_f64 (sveor_x (pg, svreinterpret_u64 (ret), sign_xy));
+
+  if (__glibc_unlikely (svptest_any (pg, cmp_xy)))
+    return special_case (y, x, ret, cmp_xy);
+
+  return ret;
+}
diff --git a/sysdeps/aarch64/fpu/atan2f_advsimd.c b/sysdeps/aarch64/fpu/atan2f_advsimd.c
new file mode 100644
index 0000000000..5a5a6202d1
--- /dev/null
+++ b/sysdeps/aarch64/fpu/atan2f_advsimd.c
@@ -0,0 +1,116 @@
+/* Single-precision AdvSIMD atan2
+
+   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[8];
+  float32x4_t pi_over_2;
+} data = {
+  /* Coefficients of polynomial P such that atan(x)~x+x*P(x^2) on
+     [2**-128, 1.0].
+     Generated using fpminimax between FLT_MIN and 1.  */
+  .poly = { V4 (-0x1.55555p-2f), V4 (0x1.99935ep-3f), V4 (-0x1.24051ep-3f),
+	    V4 (0x1.bd7368p-4f), V4 (-0x1.491f0ep-4f), V4 (0x1.93a2c0p-5f),
+	    V4 (-0x1.4c3c60p-6f), V4 (0x1.01fd88p-8f) },
+  .pi_over_2 = V4 (0x1.921fb6p+0f),
+};
+
+#define SignMask v_u32 (0x80000000)
+
+/* Special cases i.e. 0, infinity and nan (fall back to scalar calls).  */
+static float32x4_t VPCS_ATTR NOINLINE
+special_case (float32x4_t y, float32x4_t x, float32x4_t ret, uint32x4_t cmp)
+{
+  return v_call2_f32 (atan2f, y, x, ret, cmp);
+}
+
+/* Returns 1 if input is the bit representation of 0, infinity or nan.  */
+static inline uint32x4_t
+zeroinfnan (uint32x4_t i)
+{
+  /* 2 * i - 1 >= 2 * 0x7f800000lu - 1.  */
+  return vcgeq_u32 (vsubq_u32 (vmulq_n_u32 (i, 2), v_u32 (1)),
+		    v_u32 (2 * 0x7f800000lu - 1));
+}
+
+/* Fast implementation of vector atan2f. Maximum observed error is
+   2.95 ULP in [0x1.9300d6p+6 0x1.93c0c6p+6] x [0x1.8c2dbp+6 0x1.8cea6p+6]:
+   _ZGVnN4vv_atan2f (0x1.93836cp+6, 0x1.8cae1p+6) got 0x1.967f06p-1
+						 want 0x1.967f00p-1.  */
+float32x4_t VPCS_ATTR V_NAME_F2 (atan2) (float32x4_t y, float32x4_t x)
+{
+  const struct data *data_ptr = ptr_barrier (&data);
+
+  uint32x4_t ix = vreinterpretq_u32_f32 (x);
+  uint32x4_t iy = vreinterpretq_u32_f32 (y);
+
+  uint32x4_t special_cases = vorrq_u32 (zeroinfnan (ix), zeroinfnan (iy));
+
+  uint32x4_t sign_x = vandq_u32 (ix, SignMask);
+  uint32x4_t sign_y = vandq_u32 (iy, SignMask);
+  uint32x4_t sign_xy = veorq_u32 (sign_x, sign_y);
+
+  float32x4_t ax = vabsq_f32 (x);
+  float32x4_t ay = vabsq_f32 (y);
+
+  uint32x4_t pred_xlt0 = vcltzq_f32 (x);
+  uint32x4_t pred_aygtax = vcgtq_f32 (ay, ax);
+
+  /* Set up z for call to atanf.  */
+  float32x4_t n = vbslq_f32 (pred_aygtax, vnegq_f32 (ax), ay);
+  float32x4_t d = vbslq_f32 (pred_aygtax, ay, ax);
+  float32x4_t z = vdivq_f32 (n, d);
+
+  /* Work out the correct shift.  */
+  float32x4_t shift = vreinterpretq_f32_u32 (
+      vandq_u32 (pred_xlt0, vreinterpretq_u32_f32 (v_f32 (-2.0f))));
+  shift = vbslq_f32 (pred_aygtax, vaddq_f32 (shift, v_f32 (1.0f)), shift);
+  shift = vmulq_f32 (shift, data_ptr->pi_over_2);
+
+  /* Calculate the polynomial approximation.
+     Use 2-level Estrin scheme for P(z^2) with deg(P)=7. However,
+     a standard implementation using z8 creates spurious underflow
+     in the very last fma (when z^8 is small enough).
+     Therefore, we split the last fma into a mul and an fma.
+     Horner and single-level Estrin have higher errors that exceed
+     threshold.  */
+  float32x4_t z2 = vmulq_f32 (z, z);
+  float32x4_t z4 = vmulq_f32 (z2, z2);
+
+  float32x4_t ret = vfmaq_f32 (
+      v_pairwise_poly_3_f32 (z2, z4, data_ptr->poly), z4,
+      vmulq_f32 (z4, v_pairwise_poly_3_f32 (z2, z4, data_ptr->poly + 4)));
+
+  /* y = shift + z * P(z^2).  */
+  ret = vaddq_f32 (vfmaq_f32 (z, ret, vmulq_f32 (z2, z)), shift);
+
+  /* Account for the sign of y.  */
+  ret = vreinterpretq_f32_u32 (
+      veorq_u32 (vreinterpretq_u32_f32 (ret), sign_xy));
+
+  if (__glibc_unlikely (v_any_u32 (special_cases)))
+    {
+      return special_case (y, x, ret, special_cases);
+    }
+
+  return ret;
+}
diff --git a/sysdeps/aarch64/fpu/atan2f_sve.c b/sysdeps/aarch64/fpu/atan2f_sve.c
new file mode 100644
index 0000000000..606a62c144
--- /dev/null
+++ b/sysdeps/aarch64/fpu/atan2f_sve.c
@@ -0,0 +1,110 @@
+/* Single-precision SVE atan2
+
+   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[8];
+  float32_t pi_over_2;
+} data = {
+  /* Coefficients of polynomial P such that atan(x)~x+x*P(x^2) on
+     [2**-128, 1.0].  */
+  .poly = { -0x1.55555p-2f, 0x1.99935ep-3f, -0x1.24051ep-3f, 0x1.bd7368p-4f,
+	    -0x1.491f0ep-4f, 0x1.93a2c0p-5f, -0x1.4c3c60p-6f, 0x1.01fd88p-8f },
+  .pi_over_2 = 0x1.921fb6p+0f,
+};
+
+#define SignMask sv_u32 (0x80000000)
+
+/* Special cases i.e. 0, infinity, nan (fall back to scalar calls).  */
+static inline svfloat32_t
+special_case (svfloat32_t y, svfloat32_t x, svfloat32_t ret,
+	      const svbool_t cmp)
+{
+  return sv_call2_f32 (atan2f, y, x, ret, cmp);
+}
+
+/* Returns a predicate indicating true if the input is the bit representation
+   of 0, infinity or nan.  */
+static inline svbool_t
+zeroinfnan (svuint32_t i, const svbool_t pg)
+{
+  return svcmpge (pg, svsub_x (pg, svlsl_x (pg, i, 1), 1),
+		  sv_u32 (2 * 0x7f800000lu - 1));
+}
+
+/* Fast implementation of SVE atan2f based on atan(x) ~ shift + z + z^3 *
+   P(z^2) with reduction to [0,1] using z=1/x and shift = pi/2. Maximum
+   observed error is 2.95 ULP:
+   _ZGVsMxvv_atan2f (0x1.93836cp+6, 0x1.8cae1p+6) got 0x1.967f06p-1
+						 want 0x1.967f00p-1.  */
+svfloat32_t SV_NAME_F2 (atan2) (svfloat32_t y, svfloat32_t x, const svbool_t pg)
+{
+  const struct data *data_ptr = ptr_barrier (&data);
+
+  svuint32_t ix = svreinterpret_u32 (x);
+  svuint32_t iy = svreinterpret_u32 (y);
+
+  svbool_t cmp_x = zeroinfnan (ix, pg);
+  svbool_t cmp_y = zeroinfnan (iy, pg);
+  svbool_t cmp_xy = svorr_z (pg, cmp_x, cmp_y);
+
+  svuint32_t sign_x = svand_x (pg, ix, SignMask);
+  svuint32_t sign_y = svand_x (pg, iy, SignMask);
+  svuint32_t sign_xy = sveor_x (pg, sign_x, sign_y);
+
+  svfloat32_t ax = svabs_x (pg, x);
+  svfloat32_t ay = svabs_x (pg, y);
+
+  svbool_t pred_xlt0 = svcmplt (pg, x, 0.0);
+  svbool_t pred_aygtax = svcmpgt (pg, ay, ax);
+
+  /* Set up z for call to atan.  */
+  svfloat32_t n = svsel (pred_aygtax, svneg_x (pg, ax), ay);
+  svfloat32_t d = svsel (pred_aygtax, ay, ax);
+  svfloat32_t z = svdiv_x (pg, n, d);
+
+  /* Work out the correct shift.  */
+  svfloat32_t shift = svsel (pred_xlt0, sv_f32 (-2.0), sv_f32 (0.0));
+  shift = svsel (pred_aygtax, svadd_x (pg, shift, 1.0), shift);
+  shift = svmul_x (pg, shift, sv_f32 (data_ptr->pi_over_2));
+
+  /* Use split Estrin scheme for P(z^2) with deg(P)=7.  */
+  svfloat32_t z2 = svmul_x (pg, z, z);
+  svfloat32_t z4 = svmul_x (pg, z2, z2);
+  svfloat32_t z8 = svmul_x (pg, z4, z4);
+
+  svfloat32_t ret = sv_estrin_7_f32_x (pg, z2, z4, z8, data_ptr->poly);
+
+  /* ret = shift + z + z^3 * P(z^2).  */
+  svfloat32_t z3 = svmul_x (pg, z2, z);
+  ret = svmla_x (pg, z, z3, ret);
+
+  ret = svadd_m (pg, ret, shift);
+
+  /* Account for the sign of x and y.  */
+  ret = svreinterpret_f32 (sveor_x (pg, svreinterpret_u32 (ret), sign_xy));
+
+  if (__glibc_unlikely (svptest_any (pg, cmp_xy)))
+    return special_case (y, x, ret, cmp_xy);
+
+  return ret;
+}
diff --git a/sysdeps/aarch64/fpu/bits/math-vector.h b/sysdeps/aarch64/fpu/bits/math-vector.h
index 37aa74fe50..7666c09083 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 _ZGVnN4vv_atan2f (__f32x4_t, __f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_acosf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_asinf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_atanf (__f32x4_t);
@@ -62,6 +63,7 @@ __vpcs __f32x4_t _ZGVnN4v_log2f (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_sinf (__f32x4_t);
 __vpcs __f32x4_t _ZGVnN4v_tanf (__f32x4_t);
 
+__vpcs __f64x2_t _ZGVnN2vv_atan2 (__f64x2_t, __f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_acos (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_asin (__f64x2_t);
 __vpcs __f64x2_t _ZGVnN2v_atan (__f64x2_t);
@@ -80,6 +82,7 @@ __vpcs __f64x2_t _ZGVnN2v_tan (__f64x2_t);
 
 #ifdef __SVE_VEC_MATH_SUPPORTED
 
+__sv_f32_t _ZGVsMxvv_atan2f (__sv_f32_t, __sv_f32_t, __sv_bool_t);
 __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_atanf (__sv_f32_t, __sv_bool_t);
@@ -93,6 +96,7 @@ __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 _ZGVsMxvv_atan2 (__sv_f64_t, __sv_f64_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_atan (__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 6954fe7435..0ac0240171 100644
--- a/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-double-advsimd-wrappers.c
@@ -26,6 +26,7 @@
 VPCS_VECTOR_WRAPPER (acos_advsimd, _ZGVnN2v_acos)
 VPCS_VECTOR_WRAPPER (asin_advsimd, _ZGVnN2v_asin)
 VPCS_VECTOR_WRAPPER (atan_advsimd, _ZGVnN2v_atan)
+VPCS_VECTOR_WRAPPER_ff (atan2_advsimd, _ZGVnN2vv_atan2)
 VPCS_VECTOR_WRAPPER (cos_advsimd, _ZGVnN2v_cos)
 VPCS_VECTOR_WRAPPER (exp_advsimd, _ZGVnN2v_exp)
 VPCS_VECTOR_WRAPPER (exp10_advsimd, _ZGVnN2v_exp10)
diff --git a/sysdeps/aarch64/fpu/test-double-sve-wrappers.c b/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
index 1173d8f9ae..5bbc4d58c1 100644
--- a/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-double-sve-wrappers.c
@@ -32,9 +32,20 @@
     return svlastb_f64 (svptrue_b64 (), mr);                                  \
   }
 
+#define SVE_VECTOR_WRAPPER_ff(scalar_func, vector_func)                       \
+  extern VEC_TYPE vector_func (VEC_TYPE, VEC_TYPE, svbool_t);                 \
+  FLOAT scalar_func (FLOAT x, FLOAT y)                                        \
+  {                                                                           \
+    VEC_TYPE mx = svdup_n_f64 (x);                                            \
+    VEC_TYPE my = svdup_n_f64 (y);                                            \
+    VEC_TYPE mr = vector_func (mx, my, svptrue_b64 ());                       \
+    return svlastb_f64 (svptrue_b64 (), mr);                                  \
+  }
+
 SVE_VECTOR_WRAPPER (acos_sve, _ZGVsMxv_acos)
 SVE_VECTOR_WRAPPER (asin_sve, _ZGVsMxv_asin)
 SVE_VECTOR_WRAPPER (atan_sve, _ZGVsMxv_atan)
+SVE_VECTOR_WRAPPER_ff (atan2_sve, _ZGVsMxvv_atan2)
 SVE_VECTOR_WRAPPER (cos_sve, _ZGVsMxv_cos)
 SVE_VECTOR_WRAPPER (exp_sve, _ZGVsMxv_exp)
 SVE_VECTOR_WRAPPER (exp10_sve, _ZGVsMxv_exp10)
diff --git a/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c b/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
index 387efc30f8..a557bfc3a6 100644
--- a/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-float-advsimd-wrappers.c
@@ -26,6 +26,7 @@
 VPCS_VECTOR_WRAPPER (acosf_advsimd, _ZGVnN4v_acosf)
 VPCS_VECTOR_WRAPPER (asinf_advsimd, _ZGVnN4v_asinf)
 VPCS_VECTOR_WRAPPER (atanf_advsimd, _ZGVnN4v_atanf)
+VPCS_VECTOR_WRAPPER_ff (atan2f_advsimd, _ZGVnN4vv_atan2f)
 VPCS_VECTOR_WRAPPER (cosf_advsimd, _ZGVnN4v_cosf)
 VPCS_VECTOR_WRAPPER (expf_advsimd, _ZGVnN4v_expf)
 VPCS_VECTOR_WRAPPER (exp10f_advsimd, _ZGVnN4v_exp10f)
diff --git a/sysdeps/aarch64/fpu/test-float-sve-wrappers.c b/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
index dddd4cb213..f36939e2c4 100644
--- a/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
+++ b/sysdeps/aarch64/fpu/test-float-sve-wrappers.c
@@ -32,9 +32,20 @@
     return svlastb_f32 (svptrue_b32 (), mr);                                  \
   }
 
+#define SVE_VECTOR_WRAPPER_ff(scalar_func, vector_func)                       \
+  extern VEC_TYPE vector_func (VEC_TYPE, VEC_TYPE, svbool_t);                 \
+  FLOAT scalar_func (FLOAT x, FLOAT y)                                        \
+  {                                                                           \
+    VEC_TYPE mx = svdup_n_f32 (x);                                            \
+    VEC_TYPE my = svdup_n_f32 (y);                                            \
+    VEC_TYPE mr = vector_func (mx, my, svptrue_b32 ());                       \
+    return svlastb_f32 (svptrue_b32 (), mr);                                  \
+  }
+
 SVE_VECTOR_WRAPPER (acosf_sve, _ZGVsMxv_acosf)
 SVE_VECTOR_WRAPPER (asinf_sve, _ZGVsMxv_asinf)
 SVE_VECTOR_WRAPPER (atanf_sve, _ZGVsMxv_atanf)
+SVE_VECTOR_WRAPPER_ff (atan2f_sve, _ZGVsMxvv_atan2f)
 SVE_VECTOR_WRAPPER (cosf_sve, _ZGVsMxv_cosf)
 SVE_VECTOR_WRAPPER (expf_sve, _ZGVsMxv_expf)
 SVE_VECTOR_WRAPPER (exp10f_sve, _ZGVsMxv_exp10f)
diff --git a/sysdeps/aarch64/fpu/test-vpcs-vector-wrapper.h b/sysdeps/aarch64/fpu/test-vpcs-vector-wrapper.h
index f8e6a3fb9d..9551a9ea6f 100644
--- a/sysdeps/aarch64/fpu/test-vpcs-vector-wrapper.h
+++ b/sysdeps/aarch64/fpu/test-vpcs-vector-wrapper.h
@@ -29,3 +29,17 @@
     TEST_VEC_LOOP (mr, VEC_LEN);                                              \
     return ((FLOAT) mr[0]);                                                   \
   }
+
+#define VPCS_VECTOR_WRAPPER_ff(scalar_func, vector_func)                      \
+  extern __attribute__ ((aarch64_vector_pcs))                                 \
+  VEC_TYPE vector_func (VEC_TYPE, VEC_TYPE);                                  \
+  FLOAT scalar_func (FLOAT x, FLOAT y)                                        \
+  {                                                                           \
+    int i;                                                                    \
+    VEC_TYPE mx, my;                                                          \
+    INIT_VEC_LOOP (mx, x, VEC_LEN);                                           \
+    INIT_VEC_LOOP (my, y, VEC_LEN);                                           \
+    VEC_TYPE mr = vector_func (mx, my);                                       \
+    TEST_VEC_LOOP (mr, VEC_LEN);                                              \
+    return ((FLOAT) mr[0]);                                                   \
+  }
diff --git a/sysdeps/aarch64/fpu/vecmath_config.h b/sysdeps/aarch64/fpu/vecmath_config.h
index 2c8e243236..0e631fbdd5 100644
--- a/sysdeps/aarch64/fpu/vecmath_config.h
+++ b/sysdeps/aarch64/fpu/vecmath_config.h
@@ -35,6 +35,17 @@
     __ptr;                                                                    \
   })
 
+static inline uint64_t
+asuint64 (double f)
+{
+  union
+  {
+    double f;
+    uint64_t i;
+  } u = { f };
+  return u.i;
+}
+
 #define V_LOG_POLY_ORDER 6
 #define V_LOG_TABLE_BITS 7
 extern const struct v_log_data