powerpc: Remove optimized isinf

The powerpc isinf optimizations onyl adds complexity:

  - 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 pattern and branch
    implementation for INF and denormal that does:

    return (ix & UINT64_C (0x7fffffffffffffff)) == UINT64_C (0x7ff0000000000000)

    Although it does show slight better latency than generic algorithm
    (as below), it is only for power7 and requires it to override it
    for power8.

  - 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_isinf* and s_isinf*
	objects.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinf-power7.S:
	Remove file.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinf-ppc32.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinf.c: Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinff-ppc32.c:
	Likewise.
	* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinff.c: Likewise.
	* sysdeps/powerpc/powerpc32/power7/fpu/s_isinf.S: Likewise.
	* sysdeps/powerpc/powerpc32/power7/fpu/s_isinff.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile (sysdep_call):
	Remove s_isinf* and s_isinf* objects.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf-power7.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf-power8.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf-ppc64.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinff-ppc64.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinff.c: Likewise.
	* sysdeps/powerpc/powerpc64/power7/fpu/s_isinf.S: Likewise.
	* sysdeps/powerpc/powerpc64/power7/fpu/s_isinff.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_isinf.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S: Likewise.

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

2 files changed, 0 insertions, 62 deletions

diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_isinf.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_isinf.S
deleted file mode 100644
index 1fb2851a84..0000000000
--- a/sysdeps/powerpc/powerpc64/power8/fpu/s_isinf.S
+++ /dev/null
@@ -1,61 +0,0 @@
-/* isinf().  PowerPC64/POWER8 version.
-   Copyright (C) 2014-2019 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>
-
-#define MFVSRD_R3_V1  .long 0x7c230066     /* mfvsrd  r3,vs1  */
-
-/* int [r3] __isinf([fp1] x)  */
-
-ENTRY_TOCLESS (__isinf, 4)
-	CALL_MCOUNT 0
-	MFVSRD_R3_V1
-	lis     r9,0x7ff0     /* r9 = 0x7ff0  */
-	rldicl  r10,r3,0,1    /* r10 = r3 & (0x8000000000000000)  */
-	sldi    r9,r9,32      /* r9 = r9 << 52  */
-	cmpd    cr7,r10,r9    /* fp1 & 0x7ff0000000000000 ?  */
-	beq     cr7,L(inf)
-	li      r3,0          /* Not inf  */
-	blr
-L(inf):
-	sradi   r3,r3,63      /* r3 = r3 >> 63  */
-	ori     r3,r3,1       /* r3 = r3 | 0x1  */
-	blr
-END (__isinf)
-
-hidden_def (__isinf)
-weak_alias (__isinf, isinf)
-
-/* It turns out that the 'double' version will also always work for
-   single-precision.  */
-strong_alias (__isinf, __isinff)
-hidden_def (__isinff)
-weak_alias (__isinff, isinff)
-
-#ifdef NO_LONG_DOUBLE
-strong_alias (__isinf, __isinfl)
-weak_alias (__isinf, isinfl)
-#endif
-
-#if !IS_IN (libm)
-# if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
-compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
-compat_symbol (libc, isinf, isinfl, GLIBC_2_0);
-# endif
-#endif
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S
deleted file mode 100644
index be759e091e..0000000000
--- a/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S
+++ /dev/null
@@ -1 +0,0 @@
-/* This function uses the same code as s_isinf.S.  */