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math: Use atanpif from CORE-MATH

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

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                     66.3296        52.7558        20.46%
x86_64v2                   66.0429        51.4007        22.17%
x86_64v3                   60.6294        48.7876        19.53%
aarch64 (Neoverse)         24.3163        20.9110        14.00%
power8                     16.5766        13.3620        19.39%
power10                    16.5115        13.4072        18.80%

reciprocal-throughput       master        patched   improvement
x86_64                     30.8599        16.0866        47.87%
x86_64v2                   29.2286        15.4688        47.08%
x86_64v3                   23.0960        12.8510        44.36%
aarch64 (Neoverse)         15.4619        10.6752        30.96%
power8                      7.9200         5.2483        33.73%
power10                     6.8539         4.6262        32.50%

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Adhemerval Zanella
2024-12-20 13:18:32 -03:00
parent 1cd9ccd8c0
commit 95a01ea955
21 changed files with 139 additions and 59 deletions
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4
sysdeps/sparc/fpu/libm-test-ulps
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@ -162,22 +162,18 @@ ldouble: 4
Function: "atanpi":
double: 2
float: 1
ldouble: 2
Function: "atanpi_downward":
double: 1
float: 2
ldouble: 1
Function: "atanpi_towardzero":
double: 1
float: 2
ldouble: 1
Function: "atanpi_upward":
double: 1
float: 1
ldouble: 2
Function: "cabs":