math: Use asinpif from CORE-MATH

The CORE-MATH implementation is correctly rounded (for any rounding mode)
and shows better performance to the generic asinpif.

The code was adapted to glibc style and to use the definition of
math_config.h (to handle errno, overflow, and underflow).

Benchtest on x64_64 (Ryzen 9 5900X, gcc 14.2.1), aarch64 (Neoverse-N1,
gcc 13.3.1), and powerpc (POWER10, gcc 13.2.1):

latency                 master        patched   improvement
x86_64                 46.4996        41.6126        10.51%
x86_64v2               46.7551        38.8235        16.96%
x86_64v3               42.6235        33.7603        20.79%
aarch64 (Neoverse)     17.4161        14.3604        17.55%
power8                 10.7347         9.0193        15.98%
power10                10.6420         9.0362        15.09%

reciprocal-throughput   master        patched   improvement
x86_64                 24.7208        16.5544        33.03%
x86_64v2               24.2177        14.8938        38.50%
x86_64v3               20.5617        10.5452        48.71%
aarch64 (Neoverse)     13.4827        7.17613        46.78%
power8                 6.46134        3.56089        44.89%
power10                5.79007        3.49544        39.63%

Reviewed-by: DJ Delorie <dj@redhat.com>

19 files changed, 141 insertions, 59 deletions

diff --git a/SHARED-FILES b/SHARED-FILES
index 3fde726..e700f4b 100644
--- a/SHARED-FILES
+++ b/SHARED-FILES
@@ -338,3 +338,7 @@ sysdeps/ieee754/flt-32/s_acospif.c:
   (src/binary32/acospi/acospif.c in CORE-MATH)
   - the code was adapted to use glibc code style and internal
     functions to handle errno, overflow, and underflow.
+sysdeps/ieee754/flt-32/s_asinpif.c:
+  (src/binary32/asinpi/asinpif.c in CORE-MATH)
+  - the code was adapted to use glibc code style and internal
+    functions to handle errno, overflow, and underflow.
diff --git a/sysdeps/aarch64/libm-test-ulps b/sysdeps/aarch64/libm-test-ulps
index 1a403d9..abb0611 100644
--- a/sysdeps/aarch64/libm-test-ulps
+++ b/sysdeps/aarch64/libm-test-ulps
@@ -115,22 +115,18 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 ldouble: 1
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/arc/fpu/libm-test-ulps b/sysdeps/arc/fpu/libm-test-ulps
index c0c5daa..35aebba 100644
--- a/sysdeps/arc/fpu/libm-test-ulps
+++ b/sysdeps/arc/fpu/libm-test-ulps
@@ -63,19 +63,15 @@ double: 3
 
 Function: "asinpi":
 double: 1
-float: 1
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 
 Function: "atan":
 double: 1
diff --git a/sysdeps/arc/nofpu/libm-test-ulps b/sysdeps/arc/nofpu/libm-test-ulps
index 2b34f5a..325546e 100644
--- a/sysdeps/arc/nofpu/libm-test-ulps
+++ b/sysdeps/arc/nofpu/libm-test-ulps
@@ -18,7 +18,6 @@ double: 2
 
 Function: "asinpi":
 double: 1
-float: 1
 
 Function: "atan":
 double: 1
diff --git a/sysdeps/arm/libm-test-ulps b/sysdeps/arm/libm-test-ulps
index afb0532..0927fdb 100644
--- a/sysdeps/arm/libm-test-ulps
+++ b/sysdeps/arm/libm-test-ulps
@@ -63,19 +63,15 @@ double: 3
 
 Function: "asinpi":
 double: 1
-float: 1
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 
 Function: "atan":
 double: 1
diff --git a/sysdeps/hppa/fpu/libm-test-ulps b/sysdeps/hppa/fpu/libm-test-ulps
index b9959c8..02cc3b5 100644
--- a/sysdeps/hppa/fpu/libm-test-ulps
+++ b/sysdeps/hppa/fpu/libm-test-ulps
@@ -63,19 +63,15 @@ double: 3
 
 Function: "asinpi":
 double: 1
-float: 1
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 
 Function: "atan":
 double: 1
diff --git a/sysdeps/i386/fpu/libm-test-ulps b/sysdeps/i386/fpu/libm-test-ulps
index 85c58f3..69d0eb1 100644
--- a/sysdeps/i386/fpu/libm-test-ulps
+++ b/sysdeps/i386/fpu/libm-test-ulps
@@ -101,25 +101,21 @@ ldouble: 5
 
 Function: "asinpi":
 double: 1
-float: 1
 float128: 2
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 2
-float: 1
 float128: 2
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 float128: 1
 ldouble: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 float128: 2
 ldouble: 2
 
diff --git a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
index bc14e7e..392d7d2 100644
--- a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
+++ b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
@@ -101,25 +101,21 @@ ldouble: 5
 
 Function: "asinpi":
 double: 1
-float: 1
 float128: 2
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 2
-float: 1
 float128: 2
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 float128: 1
 ldouble: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 float128: 2
 ldouble: 2
 
diff --git a/sysdeps/ieee754/flt-32/s_asinpif.c b/sysdeps/ieee754/flt-32/s_asinpif.c
new file mode 100644
index 0000000..5e97a34
--- /dev/null
+++ b/sysdeps/ieee754/flt-32/s_asinpif.c
@@ -0,0 +1,137 @@
+/* Correctly-rounded half-revolution arc-sine function for binary32 value.
+
+Copyright (c) 2022-2025 Alexei Sibidanov.
+
+The original version of this file was copied from the CORE-MATH
+project (file src/binary32/asinpi/asinpif.c, revision 6ee58266).
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+*/
+
+#include <errno.h>
+#include <math.h>
+#include <stdint.h>
+#include <libm-alias-float.h>
+#include "math_config.h"
+
+float
+__asinpif (float x)
+{
+  float ax = fabsf (x);
+  double az = ax;
+  double z = x;
+  uint32_t t = asuint (x);
+  int32_t e = (t >> 23) & 0xff;
+  if (__glibc_unlikely (e >= 127))
+    {
+      if (ax == 1.0f)
+	return copysignf (0.5f, x);
+      if (e == 0xff && (t << 9))
+	return x + x; /* nan */
+      return __math_edomf ((x - x) / (x - x)); /* nan */
+    }
+  int32_t s = 146 - e;
+  int32_t i = 0;
+  /* s<32 corresponds to |x| >= 2^-12 */
+  if (__glibc_likely (s < 32))
+    i = ((t & (~0u >> 9)) | 1 << 23) >> s;
+  static const double ch[][8] =
+    {
+      {  0x1.45f306dc9c882p-2,   0x1.b2995e7b7dc2fp-5,  0x1.8723a1cf50c7ep-6,
+	 0x1.d1a4591d16a29p-7,   0x1.3ce3aa68ddaeep-7,  0x1.d3182ab0cc1bfp-8,
+	 0x1.62b379a8b88e3p-8,   0x1.6811411fcfec2p-8 },
+      {  0x1.ffffffffd3cdap-2,  -0x1.17cc1b3355fddp-4,  0x1.d067a1e8d5a99p-6,
+	-0x1.08e16fb09314ap-6,   0x1.5eed43d42dcb2p-7, -0x1.f58baca7acc71p-8,
+	 0x1.5dab64e2dcf15p-8,  -0x1.59270e30797acp-9 },
+      {  0x1.fffffff7c4617p-2,  -0x1.17cc149ded3a2p-4,  0x1.d0654d4cb2c1ap-6,
+	-0x1.08c3ba713d33ap-6,   0x1.5d2053481079cp-7, -0x1.e485ebc545e7ep-8,
+	 0x1.303baca167dddp-8,  -0x1.dee8d16d06b38p-10 },
+      {  0x1.ffffffa749848p-2,  -0x1.17cbe7155935p-4,   0x1.d05a312269adfp-6,
+	-0x1.0862b3ee617d7p-6,   0x1.5920708db2a73p-7, -0x1.cb0463b3862c3p-8,
+	 0x1.02b82478f95d7p-8,  -0x1.52a7b8579e729p-10 },
+      {  0x1.fffffe1f92bb5p-2,  -0x1.17cb3e74c64e3p-4,  0x1.d03af67311cbfp-6,
+	-0x1.079441cbfc7ap-6,    0x1.52b4287805a61p-7, -0x1.ac3286d604a98p-8,
+	 0x1.b2f1210d9701bp-9,  -0x1.e740ddc25afd6p-11 },
+      {  0x1.fffff92beb6e2p-2,  -0x1.17c986fe9518bp-4,  0x1.cff98167c9a5ep-6,
+	-0x1.0638b591eae52p-6,   0x1.4a0803828959ep-7, -0x1.8adeca229f11dp-8,
+	 0x1.6b9a7ba05dfcep-9,  -0x1.640521a43b2dp-11 },
+      {  0x1.ffffeccee5bfcp-2,  -0x1.17c5f1753f5eap-4,  0x1.cf874e4fe258fp-6,
+	-0x1.043e6cf77b256p-6,   0x1.3f7db42227d92p-7, -0x1.691a6fa2a2882p-8,
+	 0x1.2f6543162bc61p-9,  -0x1.07d5da05822b6p-11 },
+      {  0x1.ffffd2f64431dp-2,  -0x1.17bf8208c10c1p-4,  0x1.ced7487cdb124p-6,
+	-0x1.01a0d30932905p-6,   0x1.3388f99b254dap-7, -0x1.4844e245c65bdp-8,
+	 0x1.fa777150197c6p-10, -0x1.8c1ecf16a05c8p-12 },
+      {  0x1.ffffa36d1712ep-2,  -0x1.17b523971bd4ep-4,  0x1.cddee26de2deep-6,
+	-0x1.fccb00abaaabcp-7,   0x1.269afc3622342p-7, -0x1.2933152686752p-8,
+	 0x1.a76d4956cc9a3p-10, -0x1.2ce7d6dc651cep-12 },
+      {  0x1.ffff5402ab3a1p-2,  -0x1.17a5ba85da77ap-4,  0x1.cc96894e05c02p-6,
+	-0x1.f532143cb832ep-7,   0x1.19180b660ff09p-7, -0x1.0c57417a78b3cp-8,
+	 0x1.62e26cbd7bb1ep-10, -0x1.ce28d33fe1df3p-13 },
+      {  0x1.fffed8d639751p-2,  -0x1.1790349f3ae76p-4,  0x1.caf9a4fd1b398p-6,
+	-0x1.ec986b111342ep-7,   0x1.0b53c3ad4baa4p-7, -0x1.e3c2282eeace4p-9,
+	 0x1.2a55369f55bbep-10, -0x1.667fe48c396e8p-13 },
+      {  0x1.fffe24b714161p-2,  -0x1.177394fbcb719p-4,  0x1.c90652d920ebdp-6,
+	-0x1.e3239197bddf1p-7,   0x1.fb2188525b025p-8, -0x1.b3aadd451afc7p-9,
+	 0x1.f74020f31fdabp-11, -0x1.18b0cb246768dp-13 },
+      {  0x1.fffd298bec9e2p-2,  -0x1.174efbfd34648p-4,  0x1.c6bcfe48ea92bp-6,
+	-0x1.d8f9f2a16157cp-7,   0x1.e0044f56c8864p-8, -0x1.883e2347fe76cp-9,
+	 0x1.a9f0e3c1b7af5p-11, -0x1.bb5acc0e60825p-14 },
+      {  0x1.fffbd8b784c4dp-2,  -0x1.1721abdd3722ep-4,  0x1.c41fee756d4bp-6,
+	-0x1.ce40bccf8065fp-7,   0x1.c59b684b70ef9p-8, -0x1.6133d027996b3p-9,
+	 0x1.69cad01106397p-11, -0x1.60f8e45494156p-14 },
+      {  0x1.fffa23749cf88p-2,  -0x1.16eb0a8285c06p-4,  0x1.c132d762e1b0dp-6,
+	-0x1.c31a959398f4ep-7,   0x1.ac1c5b46bc8ap-8,  -0x1.3e34f1abe51dcp-9,
+	 0x1.346738737c0b9p-11, -0x1.1b227a3f5c75p-14 },
+      {  0x1.fff7fb25bb407p-2,  -0x1.16aaa14d7564p-4,   0x1.bdfa75fca5ff2p-6,
+	-0x1.b7a6e260d079cp-7,   0x1.93ab06911033cp-8, -0x1.1ee5560967fd5p-9,
+	 0x1.07d31060838bfp-11, -0x1.c96f33a283115p-15
+      }
+  };
+  const double *c = ch[i];
+  double z2 = z * z;
+  double z4 = z2 * z2;
+  if (__glibc_unlikely (i == 0)) /* |x| < 2^-4 */
+    {
+      double c0 = c[0] + z2 * c[1];
+      double c2 = c[2] + z2 * c[3];
+      double c4 = c[4] + z2 * c[5];
+      double c6 = c[6] + z2 * c[7];
+      c0 += c2 * z4;
+      c4 += c6 * z4;
+      c0 += c4 * (z4 * z4);
+      if (__glibc_unlikely (ax != 0.0 && ax <= 0x1.921fb4p-126f))
+	__set_errno (ERANGE);
+      return z * c0;
+    }
+  else /* |x| >= 2^-4 */
+    {
+      double f = sqrt (1 - az);
+      double c0 = c[0] + az * c[1];
+      double c2 = c[2] + az * c[3];
+      double c4 = c[4] + az * c[5];
+      double c6 = c[6] + az * c[7];
+      c0 += c2 * z2;
+      c4 += c6 * z2;
+      c0 += c4 * z4;
+      double r = fma (-c0, copysign (f, x), copysign (0.5, x));
+      return r;
+    }
+}
+libm_alias_float (__asinpi, asinpi)
diff --git a/sysdeps/loongarch/lp64/libm-test-ulps b/sysdeps/loongarch/lp64/libm-test-ulps
index ce84ddf..33dd671 100644
--- a/sysdeps/loongarch/lp64/libm-test-ulps
+++ b/sysdeps/loongarch/lp64/libm-test-ulps
@@ -83,22 +83,18 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 ldouble: 1
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/mips/mips64/libm-test-ulps b/sysdeps/mips/mips64/libm-test-ulps
index 67c37df..869ceff 100644
--- a/sysdeps/mips/mips64/libm-test-ulps
+++ b/sysdeps/mips/mips64/libm-test-ulps
@@ -83,22 +83,18 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 ldouble: 1
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/or1k/fpu/libm-test-ulps b/sysdeps/or1k/fpu/libm-test-ulps
index d3b1036..75db236 100644
--- a/sysdeps/or1k/fpu/libm-test-ulps
+++ b/sysdeps/or1k/fpu/libm-test-ulps
@@ -63,19 +63,15 @@ double: 3
 
 Function: "asinpi":
 double: 1
-float: 1
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 
 Function: "atan":
 double: 1
diff --git a/sysdeps/or1k/nofpu/libm-test-ulps b/sysdeps/or1k/nofpu/libm-test-ulps
index 14b7e0f..a1f7c80 100644
--- a/sysdeps/or1k/nofpu/libm-test-ulps
+++ b/sysdeps/or1k/nofpu/libm-test-ulps
@@ -54,7 +54,6 @@ double: 3
 
 Function: "asinpi":
 double: 1
-float: 1
 
 Function: "atan":
 double: 1
diff --git a/sysdeps/powerpc/fpu/libm-test-ulps b/sysdeps/powerpc/fpu/libm-test-ulps
index c9c86de..fa3cf2e 100644
--- a/sysdeps/powerpc/fpu/libm-test-ulps
+++ b/sysdeps/powerpc/fpu/libm-test-ulps
@@ -107,25 +107,21 @@ ldouble: 7
 
 Function: "asinpi":
 double: 1
-float: 1
 float128: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 float128: 2
 ldouble: 4
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 float128: 1
 ldouble: 4
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 float128: 2
 ldouble: 4
 
diff --git a/sysdeps/riscv/nofpu/libm-test-ulps b/sysdeps/riscv/nofpu/libm-test-ulps
index 6206a95..a5184ec 100644
--- a/sysdeps/riscv/nofpu/libm-test-ulps
+++ b/sysdeps/riscv/nofpu/libm-test-ulps
@@ -71,7 +71,6 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/riscv/rvd/libm-test-ulps b/sysdeps/riscv/rvd/libm-test-ulps
index 124ca4b..3bfc966 100644
--- a/sysdeps/riscv/rvd/libm-test-ulps
+++ b/sysdeps/riscv/rvd/libm-test-ulps
@@ -83,22 +83,18 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 ldouble: 1
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/s390/fpu/libm-test-ulps b/sysdeps/s390/fpu/libm-test-ulps
index 364ccf3..7d61bf1 100644
--- a/sysdeps/s390/fpu/libm-test-ulps
+++ b/sysdeps/s390/fpu/libm-test-ulps
@@ -83,22 +83,18 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 ldouble: 1
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/sparc/fpu/libm-test-ulps b/sysdeps/sparc/fpu/libm-test-ulps
index 1174972..426f458 100644
--- a/sysdeps/sparc/fpu/libm-test-ulps
+++ b/sysdeps/sparc/fpu/libm-test-ulps
@@ -83,22 +83,18 @@ ldouble: 4
 
 Function: "asinpi":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 ldouble: 1
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "atan":
diff --git a/sysdeps/x86_64/fpu/libm-test-ulps b/sysdeps/x86_64/fpu/libm-test-ulps
index 5ed5112..d4c4bfa 100644
--- a/sysdeps/x86_64/fpu/libm-test-ulps
+++ b/sysdeps/x86_64/fpu/libm-test-ulps
@@ -180,25 +180,21 @@ float: 1
 
 Function: "asinpi":
 double: 1
-float: 1
 float128: 2
 ldouble: 2
 
 Function: "asinpi_downward":
 double: 1
-float: 1
 float128: 2
 ldouble: 2
 
 Function: "asinpi_towardzero":
 double: 1
-float: 2
 float128: 1
 ldouble: 2
 
 Function: "asinpi_upward":
 double: 2
-float: 2
 float128: 2
 ldouble: 2