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>

2 files changed, 0 insertions, 94 deletions

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 07fa8ae..0000000
--- 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 54bd941..0000000
--- a/sysdeps/powerpc/powerpc32/power7/fpu/s_finitef.S
+++ /dev/null
@@ -1 +0,0 @@
-/* This function uses the same code as s_finite.S.  */