powerpc: Remove optimized finite

The powerpc finite optimization do not show much gain:

  - GCC will call libm iff -fsignaling-nans is used. This usage pattern
    is usually not performance oriented and for such calls PLT overhead
    should dominate execution time.

  - The power7 uses ftdiv to optimize for some input patterns, but at
    cost of others.  Comparing against generic C implementation built
    for powerpc64-linux-gnu-power7 (--with-cpu=power7):

    - Generic sysdeps/ieee754 implementation:
       "isfinite": {
        "": {
         "duration": 5.0082e+09,
         "iterations": 2.45299e+09,
         "max": 43.824,
         "min": 2.008,
         "mean": 2.04167
        },
        "INF": {
         "duration": 4.66554e+09,
         "iterations": 2.28288e+09,
         "max": 35.73,
         "min": 2.008,
         "mean": 2.04371
        },
        "NAN": {
         "duration": 4.66274e+09,
         "iterations": 2.28716e+09,
         "max": 34.161,
         "min": 2.009,
         "mean": 2.03866
        }
       }

    - power7 optimized one:
       "isfinite": {
        "": {
         "duration": 4.99111e+09,
         "iterations": 2.65566e+09,
         "max": 25.015,
         "min": 1.716,
         "mean": 1.87942
        },
        "INF": {
         "duration": 4.6783e+09,
         "iterations": 2.0999e+09,
         "max": 35.264,
         "min": 1.868,
         "mean": 2.22787
        },
        "NAN": {
         "duration": 4.67915e+09,
         "iterations": 2.08678e+09,
         "max": 38.099,
         "min": 1.869,
         "mean": 2.24228
        }
       }

     So it basically optimizes marginally for normal numbers while
     increasing the latency for other kind of FP.

  - The power8 implementation is just the generic implementation using
    ISA 2.07 mfvsrd instruction (which GCC uses for generic implementation).
    So generic implementation is the best option for powerpc64le.

Checked on powerpc-linux-gnu (built without --with-cpu, with
--with-cpu=power4 and with --with-cpu=power5+ and --disable-multi-arch),
powerpc64-linux-gnu (built without --with-cp and with --with-cpu=power5+
and --disable-multi-arch).

	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
	(sysdeps_routines, libm-sysdep_routines): Remove s_finite*
	objects.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-power7.S:
	Remove file.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-ppc32.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite.c: Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef-ppc32.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef.c: Likewise.
	* sysdeps/powerpc/powerpc32/power7/fpu/s_finite.S: Likewise.
	* sysdeps/powerpc/powerpc32/power7/fpu/s_finitef.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile (sysdep_call):
	Remove s_finite* objects.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite-power7.S: Remove file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite-power8.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite-ppc64.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finite.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finitef-ppc64.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_finitef.c: Likewise.
	* sysdeps/powerpc/powerpc64/power7/fpu/s_finite.S: Likewise.
	* sysdeps/powerpc/powerpc64/power7/fpu/s_finitef.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_finite.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_finitef.S: Likewise.

Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>

8 files changed, 2 insertions, 287 deletions

diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
index c7b9d48094..51b13fe33a 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
@@ -1,13 +1,10 @@
 ifeq ($(subdir),math)
-sysdep_routines += s_finite-power7 \
-		   s_finite-ppc32 s_finitef-ppc32 \
-		   s_modf-power5+ s_modf-ppc32 \
+sysdep_routines += s_modf-power5+ s_modf-ppc32 \
 		   s_modff-power5+ s_modff-ppc32
 
 libm-sysdep_routines += s_llrintf-power6 s_llrintf-ppc32 s_llrint-power6 \
 			s_llrint-ppc32 s_llround-power6 s_llround-power5+ \
-			s_llround-ppc32 s_finite-power7 \
-			s_finite-ppc32 s_finitef-ppc32 s_ceil-power5+ \
+			s_llround-ppc32 s_ceil-power5+ \
 			s_ceil-ppc32 s_ceilf-power5+ s_ceilf-ppc32 \
 			s_floor-power5+ s_floor-ppc32 s_floorf-power5+ \
 			s_floorf-ppc32 s_round-power5+ s_round-ppc32 \
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-power7.S b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-power7.S
deleted file mode 100644
index 0cde9f1cd1..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-power7.S
+++ /dev/null
@@ -1,33 +0,0 @@
-/* finite().  PowerPC32/POWER7 version.
-   Copyright (C) 2013-2019 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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <math_ldbl_opt.h>
-
-#undef hidden_def
-#define hidden_def(name)
-#undef weak_alias
-#define weak_alias(name, alias)
-#undef strong_alias
-#define strong_alias(name, alias)
-#undef compat_symbol
-#define compat_symbol(lib, name, alias, ver)
-
-#define __finite __finite_power7
-
-#include <sysdeps/powerpc/powerpc32/power7/fpu/s_finite.S>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-ppc32.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-ppc32.c
deleted file mode 100644
index c03a26e00f..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite-ppc32.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* finite().  PowerPC32 default version.
-   Copyright (C) 2013-2019 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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <math.h>
-
-#undef weak_alias
-#define weak_alias(a, b)
-#undef strong_alias
-#define strong_alias(a, b)
-
-#define FINITE __finite_ppc32
-#ifdef SHARED
-# undef hidden_def
-# define hidden_def(a) \
-   __hidden_ver1 (__finite_ppc32, __GI___finite, __finite_ppc32);
-#endif
-
-#include <sysdeps/ieee754/dbl-64/s_finite.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite.c
deleted file mode 100644
index 677b71baf3..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finite.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/* Multiple versions of finite.
-   Copyright (C) 2013-2019 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
-   <http://www.gnu.org/licenses/>.  */
-
-#define __finite __redirect___finite
-#define __finitef __redirect___finitef
-#define __finitel __redirect___finitel
-#include <math.h>
-#include <math_ldbl_opt.h>
-#include <shlib-compat.h>
-#include "init-arch.h"
-
-extern __typeof (__finite) __finite_ppc32 attribute_hidden;
-extern __typeof (__finite) __finite_power7 attribute_hidden;
-#undef __finite
-#undef __finitef
-#undef __finitel
-
-libc_ifunc_redirected (__redirect___finite,  __finite,
-		       (hwcap & PPC_FEATURE_ARCH_2_06)
-		       ? __finite_power7
-		       : __finite_ppc32);
-
-weak_alias (__finite, finite)
-
-#ifdef NO_LONG_DOUBLE
-strong_alias (__finite, __finitel)
-weak_alias (__finite, finitel)
-#endif
-
-#if IS_IN (libm)
-# if LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)
-compat_symbol (libm, finite, finitel, GLIBC_2_0);
-# endif
-# if LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)
-compat_symbol (libm, __finite, __finitel, GLIBC_2_1);
-# endif
-#else
-# if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)
-compat_symbol (libc, __finite, __finitel, GLIBC_2_0);
-compat_symbol (libc, finite, finitel, GLIBC_2_0);
-# endif
-#endif
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef-ppc32.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef-ppc32.c
deleted file mode 100644
index e43c7a54bc..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef-ppc32.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/* finitef().  PowerPC32 default version.
-   Copyright (C) 2013-2019 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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <math.h>
-
-#undef weak_alias
-#define weak_alias(a, b)
-
-#define FINITEF __finitef_ppc32
-#ifdef SHARED
-# undef hidden_def
-# define hidden_def(a) \
-   __hidden_ver1 (__finitef_ppc32, __GI___finitef, __finitef_ppc32);
-#endif
-
-#include <sysdeps/ieee754/flt-32/s_finitef.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef.c
deleted file mode 100644
index da4780551e..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_finitef.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/* Multiple versions of finitef.
-   Copyright (C) 2013-2019 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
-   <http://www.gnu.org/licenses/>.  */
-
-#define __finitef __redirect___finitef
-#include <math.h>
-#include <shlib-compat.h>
-#include "init-arch.h"
-
-extern __typeof (__finitef) __finitef_ppc32 attribute_hidden;
-/* The power7 finite(double) works for float.  */
-extern __typeof (__finitef) __finite_power7 attribute_hidden;
-#undef __finitef
-
-libc_ifunc_redirected  (__redirect___finitef, __finitef,
-			(hwcap & PPC_FEATURE_ARCH_2_06)
-			? __finite_power7
-			: __finitef_ppc32);
-
-weak_alias (__finitef, finitef)
diff --git a/sysdeps/powerpc/powerpc32/power7/fpu/s_finite.S b/sysdeps/powerpc/powerpc32/power7/fpu/s_finite.S
deleted file mode 100644
index 07fa8ae7b7..0000000000
--- a/sysdeps/powerpc/powerpc32/power7/fpu/s_finite.S
+++ /dev/null
@@ -1,93 +0,0 @@
-/* finite().  PowerPC32/POWER7 version.
-   Copyright (C) 2010-2019 Free Software Foundation, Inc.
-   Contributed by Luis Machado <luisgpm@br.ibm.com>.
-   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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <math_ldbl_opt.h>
-
-/* int __finite(x)  */
-	.section    .rodata.cst8,"aM",@progbits,8
-	.align 3
-.LC0:   /* 1.0 */
-	.quad	    0x3ff0000000000000
-
-	.section    ".text"
-	.type	    __finite, @function
-	.machine    power7
-ENTRY (__finite)
-#ifdef SHARED
-	mflr	r11
-	cfi_register(lr,r11)
-
-	SETUP_GOT_ACCESS(r9,got_label)
-	addis	r9,r9,.LC0-got_label@ha
-	lfd	fp0,.LC0-got_label@l(r9)
-
-	mtlr	r11
-	cfi_same_value (lr)
-#else
-	lis	r9,.LC0@ha
-	lfd	fp0,.LC0@l(r9)
-#endif
-	ftdiv	cr7,fp1,fp0
-	li	r3,1
-	bflr	30
-
-	/* We have -INF/+INF/NaN or a denormal.  */
-
-	stwu	r1,-16(r1)    /* Allocate stack space.  */
-	stfd    fp1,8(r1)     /* Transfer FP to GPR's.  */
-
-	ori	2,2,0	      /* Force a new dispatch group.  */
-	lhz	r0,8+HISHORT(r1) /* Fetch the upper 16 bits of the FP value
-				    (biased exponent and sign bit).  */
-	clrlwi	r0,r0,17      /* r0 = abs(r0).  */
-	addi	r1,r1,16      /* Reset the stack pointer.  */
-	cmpwi	cr7,r0,0x7ff0 /* r4 == 0x7ff0?.  */
-	bltlr	cr7	      /* LT means we have a denormal.  */
-	li	r3,0
-	blr
-	END (__finite)
-
-hidden_def (__finite)
-weak_alias (__finite, finite)
-
-/* It turns out that the 'double' version will also always work for
-   single-precision.  */
-strong_alias (__finite, __finitef)
-hidden_def (__finitef)
-weak_alias (__finitef, finitef)
-
-#ifdef NO_LONG_DOUBLE
-strong_alias (__finite, __finitel)
-weak_alias (__finite, finitel)
-#endif
-
-#if IS_IN (libm)
-# if LONG_DOUBLE_COMPAT (libm, GLIBC_2_0)
-compat_symbol (libm, finite, finitel, GLIBC_2_0)
-# endif
-# if LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)
-compat_symbol (libm, __finite, __finitel, GLIBC_2_1)
-# endif
-#else
-# if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)
-compat_symbol (libc, __finite, __finitel, GLIBC_2_0);
-compat_symbol (libc, finite, finitel, GLIBC_2_0);
-# endif
-#endif
diff --git a/sysdeps/powerpc/powerpc32/power7/fpu/s_finitef.S b/sysdeps/powerpc/powerpc32/power7/fpu/s_finitef.S
deleted file mode 100644
index 54bd94176d..0000000000
--- a/sysdeps/powerpc/powerpc32/power7/fpu/s_finitef.S
+++ /dev/null
@@ -1 +0,0 @@
-/* This function uses the same code as s_finite.S.  */