math: Use log1pf from CORE-MATH

The CORE-MATH implementation is correctly rounded (for any rounding mode)
and shows slight better performance to the generic log1pf.

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 (M1,
gcc 13.2.1), and powerpc (POWER10, gcc 13.2.1):

Latency                      master        patched   improvement
x86_64                      71.8142        38.9668        45.74%
x86_64v2                    71.9094        39.1321        45.58%
x86_64v3                    60.1000        32.4016        46.09%
i686                        147.105        104.258        29.13%
aarch64                     26.4439        14.0050        47.04%
power10                     19.4874         9.4146        51.69%
powerpc                     17.6145        8.00736        54.54%

reciprocal-throughput        master        patched   improvement
x86_64                      19.7604        12.7254        35.60%
x86_64v2                    19.0039        11.9455        37.14%
x86_64v3                    16.8559        11.9317        29.21%
i686                        82.3426        73.9718        10.17%
aarch64                     14.4665         7.9614        44.97%
power10                     11.9974         8.4117        29.89%
powerpc                     7.15222         6.0914        14.83%

Signed-off-by: Alexei Sibidanov <sibid@uvic.ca>
Signed-off-by: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: DJ Delorie <dj@redhat.com>

30 files changed, 193 insertions, 340 deletions

diff --git a/SHARED-FILES b/SHARED-FILES
index 58ea318ccc..7fa54a5c9d 100644
--- a/SHARED-FILES
+++ b/SHARED-FILES
@@ -260,3 +260,7 @@ sysdeps/ieee754/flt-32/s_log2p1f.c
   (file src/binary32/log2p1/log2p1f.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_log1pf.c
+  (file src/binary32/log1p/log1pf.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 cb1c18cb50..5700c712ff 100644
--- a/sysdeps/aarch64/libm-test-ulps
+++ b/sysdeps/aarch64/libm-test-ulps
@@ -1366,7 +1366,6 @@ ldouble: 4
 
 Function: "log1p":
 double: 1
-float: 1
 ldouble: 3
 
 Function: "log1p_advsimd":
@@ -1375,7 +1374,6 @@ float: 1
 
 Function: "log1p_downward":
 double: 1
-float: 2
 ldouble: 3
 
 Function: "log1p_sve":
@@ -1384,12 +1382,10 @@ float: 1
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 ldouble: 3
 
 Function: "log1p_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "log2":
@@ -1459,22 +1455,18 @@ ldouble: 1
 
 Function: "logp1":
 double: 1
-float: 1
 ldouble: 3
 
 Function: "logp1_downward":
 double: 1
-float: 2
 ldouble: 3
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 ldouble: 3
 
 Function: "logp1_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "pow":
diff --git a/sysdeps/alpha/fpu/libm-test-ulps b/sysdeps/alpha/fpu/libm-test-ulps
index 09185dd902..212c52c8cc 100644
--- a/sysdeps/alpha/fpu/libm-test-ulps
+++ b/sysdeps/alpha/fpu/libm-test-ulps
@@ -1202,22 +1202,18 @@ ldouble: 3
 
 Function: "log1p":
 double: 1
-float: 1
 ldouble: 3
 
 Function: "log1p_downward":
 double: 2
-float: 2
 ldouble: 3
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 ldouble: 3
 
 Function: "log1p_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "log2":
@@ -1267,22 +1263,18 @@ ldouble: 1
 
 Function: "logp1":
 double: 1
-float: 1
 ldouble: 3
 
 Function: "logp1_downward":
 double: 2
-float: 2
 ldouble: 3
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 ldouble: 3
 
 Function: "logp1_upward":
 double: 2
-float: 2
 ldouble: 2
 
 Function: "pow":
diff --git a/sysdeps/arc/fpu/libm-test-ulps b/sysdeps/arc/fpu/libm-test-ulps
index d2ec67b504..f73aae2833 100644
--- a/sysdeps/arc/fpu/libm-test-ulps
+++ b/sysdeps/arc/fpu/libm-test-ulps
@@ -981,19 +981,15 @@ float: 3
 
 Function: "log1p":
 double: 1
-float: 1
 
 Function: "log1p_downward":
 double: 1
-float: 2
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 
 Function: "log1p_upward":
 double: 2
-float: 2
 
 Function: "log2":
 double: 2
@@ -1029,19 +1025,15 @@ float: 1
 
 Function: "logp1":
 double: 1
-float: 1
 
 Function: "logp1_downward":
 double: 1
-float: 2
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 
 Function: "logp1_upward":
 double: 2
-float: 2
 
 Function: "pow":
 double: 1
diff --git a/sysdeps/arc/nofpu/libm-test-ulps b/sysdeps/arc/nofpu/libm-test-ulps
index fe74fb8ea9..f6d1ef062c 100644
--- a/sysdeps/arc/nofpu/libm-test-ulps
+++ b/sysdeps/arc/nofpu/libm-test-ulps
@@ -238,7 +238,6 @@ float: 2
 
 Function: "log1p":
 double: 1
-float: 1
 
 Function: "log2":
 double: 2
diff --git a/sysdeps/arm/libm-test-ulps b/sysdeps/arm/libm-test-ulps
index b6b194143a..502680ff1b 100644
--- a/sysdeps/arm/libm-test-ulps
+++ b/sysdeps/arm/libm-test-ulps
@@ -974,19 +974,15 @@ float: 3
 
 Function: "log1p":
 double: 1
-float: 1
 
 Function: "log1p_downward":
 double: 2
-float: 2
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 
 Function: "log1p_upward":
 double: 2
-float: 2
 
 Function: "log2":
 double: 2
@@ -1028,19 +1024,15 @@ float: 2
 
 Function: "logp1":
 double: 1
-float: 1
 
 Function: "logp1_downward":
 double: 2
-float: 2
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 
 Function: "logp1_upward":
 double: 2
-float: 2
 
 Function: "pow":
 double: 1
diff --git a/sysdeps/csky/fpu/libm-test-ulps b/sysdeps/csky/fpu/libm-test-ulps
index 3f17778d03..a7b2bec17e 100644
--- a/sysdeps/csky/fpu/libm-test-ulps
+++ b/sysdeps/csky/fpu/libm-test-ulps
@@ -919,19 +919,15 @@ float: 2
 
 Function: "log1p":
 double: 1
-float: 1
 
 Function: "log1p_downward":
 double: 2
-float: 2
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 
 Function: "log1p_upward":
 double: 2
-float: 2
 
 Function: "log2":
 double: 2
@@ -948,19 +944,15 @@ double: 3
 
 Function: "logp1":
 double: 1
-float: 1
 
 Function: "logp1_downward":
 double: 2
-float: 2
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 
 Function: "logp1_upward":
 double: 2
-float: 2
 
 Function: "pow":
 double: 1
diff --git a/sysdeps/csky/nofpu/libm-test-ulps b/sysdeps/csky/nofpu/libm-test-ulps
index fdef935578..4e4451a5d2 100644
--- a/sysdeps/csky/nofpu/libm-test-ulps
+++ b/sysdeps/csky/nofpu/libm-test-ulps
@@ -920,19 +920,15 @@ float: 2
 
 Function: "log1p":
 double: 1
-float: 1
 
 Function: "log1p_downward":
 double: 2
-float: 2
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 
 Function: "log1p_upward":
 double: 2
-float: 2
 
 Function: "log2":
 double: 2
@@ -962,19 +958,15 @@ float: 2
 
 Function: "logp1":
 double: 1
-float: 1
 
 Function: "logp1_downward":
 double: 2
-float: 2
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 
 Function: "logp1_upward":
 double: 2
-float: 2
 
 Function: "pow":
 double: 1
diff --git a/sysdeps/hppa/fpu/libm-test-ulps b/sysdeps/hppa/fpu/libm-test-ulps
index 9f89528947..b56f512b39 100644
--- a/sysdeps/hppa/fpu/libm-test-ulps
+++ b/sysdeps/hppa/fpu/libm-test-ulps
@@ -997,19 +997,15 @@ float: 3
 
 Function: "log1p":
 double: 1
-float: 1
 
 Function: "log1p_downward":
 double: 2
-float: 2
 
 Function: "log1p_towardzero":
 double: 2
-float: 2
 
 Function: "log1p_upward":
 double: 2
-float: 2
 
 Function: "log2":
 double: 2
@@ -1051,19 +1047,15 @@ float: 2
 
 Function: "logp1":
 double: 1
-float: 1
 
 Function: "logp1_downward":
 double: 2
-float: 2
 
 Function: "logp1_towardzero":
 double: 2
-float: 2
 
 Function: "logp1_upward":
 double: 2
-float: 2
 
 Function: "pow":
 double: 1
diff --git a/sysdeps/i386/fpu/libm-test-ulps b/sysdeps/i386/fpu/libm-test-ulps
index d0bd63371d..63ef3569b4 100644
--- a/sysdeps/i386/fpu/libm-test-ulps
+++ b/sysdeps/i386/fpu/libm-test-ulps
@@ -1443,19 +1443,16 @@ ldouble: 2
 
 Function: "log1p_downward":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "log1p_towardzero":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "log1p_upward":
 double: 1
-float: 1
 float128: 2
 ldouble: 3
 
@@ -1524,19 +1521,16 @@ ldouble: 2
 
 Function: "logp1_downward":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "logp1_towardzero":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "logp1_upward":
 double: 1
-float: 1
 float128: 2
 ldouble: 3
 
diff --git a/sysdeps/i386/fpu/s_log1pf.S b/sysdeps/i386/fpu/s_log1pf.S
deleted file mode 100644
index 82a3f448db..0000000000
--- a/sysdeps/i386/fpu/s_log1pf.S
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Public domain.
- */
-
-#include <machine/asm.h>
-#include <i386-math-asm.h>
-
-RCSID("$NetBSD: s_log1pf.S,v 1.4 1995/05/09 00:13:05 jtc Exp $")
-
-	.section .rodata
-
-	.align ALIGNARG(4)
-	/* The fyl2xp1 can only be used for values in
-		-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2
-	   0.29 is a safe value.
-	*/
-limit:	.float 0.29
-one:	.float 1.0
-
-DEFINE_FLT_MIN
-
-#ifdef PIC
-# define MO(op) op##@GOTOFF(%edx)
-#else
-# define MO(op) op
-#endif
-
-/*
- * Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,
- * otherwise fyl2x with the needed extra computation.
- */
-	.text
-ENTRY(__log1pf)
-	fldln2
-
-	flds	4(%esp)
-
-#ifdef	PIC
-	LOAD_PIC_REG (dx)
-#endif
-
-	fxam
-	fnstsw
-	fld	%st
-	sahf
-	jc	3f		// in case x is NaN or ħInf
-4:	fabs
-	fcomps	MO(limit)
-	fnstsw
-	sahf
-	jc	2f
-
-	fadds	MO(one)
-	fyl2x
-	ret
-
-2:	fyl2xp1
-	FLT_CHECK_FORCE_UFLOW_NONNAN
-	ret
-
-3:	jp	4b		// in case x is ħInf
-	fstp	%st(1)
-	fstp	%st(1)
-	ret
-
-END (__log1pf)
diff --git a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
index a97722b7e7..f6393dbdf1 100644
--- a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
+++ b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps
@@ -1446,19 +1446,16 @@ ldouble: 2
 
 Function: "log1p_downward":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "log1p_towardzero":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "log1p_upward":
 double: 1
-float: 1
 float128: 2
 ldouble: 3
 
@@ -1527,19 +1524,16 @@ ldouble: 2
 
 Function: "logp1_downward":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "logp1_towardzero":
 double: 1
-float: 1
 float128: 3
 ldouble: 4
 
 Function: "logp1_upward":
 double: 1
-float: 1
 float128: 2
 ldouble: 3
 
diff --git a/sysdeps/ieee754/flt-32/s_log1pf.c b/sysdeps/ieee754/flt-32/s_log1pf.c
index 555f0f82c8..d1686e78aa 100644
--- a/sysdeps/ieee754/flt-32/s_log1pf.c
+++ b/sysdeps/ieee754/flt-32/s_log1pf.c
@@ -1,116 +1,181 @@
-/* s_log1pf.c -- float version of s_log1p.c.
- */
+/* Correctly-rounded biased argument natural logarithm function for binary32
+   value.
 
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
+Copyright (c) 2023, 2024  Alexei Sibidanov.
 
-#include <float.h>
-#include <math.h>
-#include <math-barriers.h>
-#include <math_private.h>
-#include <math-underflow.h>
-#include <libc-diag.h>
+This file is part of the CORE-MATH project
+project (file src/binary32/log1p/log1pf.c revision bc385c2).
 
-static const float
-ln2_hi =   6.9313812256e-01,	/* 0x3f317180 */
-ln2_lo =   9.0580006145e-06,	/* 0x3717f7d1 */
-two25 =    3.355443200e+07,	/* 0x4c000000 */
-Lp1 = 6.6666668653e-01,	/* 3F2AAAAB */
-Lp2 = 4.0000000596e-01,	/* 3ECCCCCD */
-Lp3 = 2.8571429849e-01, /* 3E924925 */
-Lp4 = 2.2222198546e-01, /* 3E638E29 */
-Lp5 = 1.8183572590e-01, /* 3E3A3325 */
-Lp6 = 1.5313838422e-01, /* 3E1CD04F */
-Lp7 = 1.4798198640e-01; /* 3E178897 */
+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:
 
-static const float zero = 0.0;
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
 
-float
-__log1pf(float x)
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL