Remove SPARC sqrt wrappers (bug 21973).

This patch removes the SPARC-specific wrappers for sqrt and sqrtf.

These wrappers, by adding architecture-specific uses of _LIB_VERSION
and __kernel_standard, unnecessarily complicate cleanups of libm error
handling.  They also do not serve a useful optimization purpose.  GCC
knows about sqrt as a built-in function, and can generate direct calls
to a hardware square root instruction, either on its own, in the
-fno-math-errno case, or together with an inline check for the
argument being negative and a call to the out-of-line sqrt function
for error handling only in that case (and has been able to do so for a
long time).  Thus in practice the wrapper will only be called only in
the case of negative arguments, which is not a case it is useful to
optimize for.

The removal of the wrappers also uncovers, and fixes, an old bug.
32-bit SPARC libm used (checked with glibc 2.8 binaries) to have a
sqrtl compat symbol, version GLIBC_2.0, for old binaries when sqrtl
was an alias of sqrt (I don't have pre-glibc-2.4 binaries for SPARC to
hand to check for the sqrtl symbol in those).  This disappeared,
probably with:

commit 8847f0377003fbfe9cbe951ce9f8717d74f26247
Author: David S. Miller <davem@davemloft.net>
Date:   Tue Feb 28 22:37:58 2012 -0800

    Add sparc optimized sqrt{,f}.

Removing the wrappers brings back the generic ldbl-opt logic for
creating such compat symbols, and so restores the compat symbol that
should be there.  This could of course also be fixed in the wrappers -
but as noted above, the wrappers are optimizing a case it's not useful
to optimize, so the bug of the missing compat symbol serves to
illustrate the risks involved with the extra complexity of
architecture-specific function versions where not needed.

Tested with build-many-glibcs.py.

	[BZ #21973]
	* sysdeps/sparc/sparc32/fpu/w_sqrt_compat.S: Remove file.
	* sysdeps/sparc/sparc32/fpu/w_sqrtf_compat.S: Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/w_sqrt_compat-vis3.S:
	Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/w_sqrt_compat.S:
	Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/w_sqrtf_compat-vis3.S:
	Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/w_sqrtf_compat.S:
	Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/w_sqrt_compat.S : Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/w_sqrtf_compat.S: Likewise.
	* sysdeps/sparc/sparc64/fpu/w_sqrt_compat.S: Likewise.
	* sysdeps/sparc/sparc64/fpu/w_sqrtf_compat.S: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Add
	GLIBC_2.0 sqrtl symbol.

2 files changed, 0 insertions, 98 deletions

diff --git a/sysdeps/sparc/sparc64/fpu/w_sqrt_compat.S b/sysdeps/sparc/sparc64/fpu/w_sqrt_compat.S
deleted file mode 100644
index 937e15009e..0000000000
--- a/sysdeps/sparc/sparc64/fpu/w_sqrt_compat.S
+++ /dev/null
@@ -1,49 +0,0 @@
-/* sqrt function.  sparc64 version.
-   Copyright (C) 2012-2017 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-svid-compat.h>
-
-ENTRY (__sqrt)
-	fzero	%f8
-	fcmpd	%fcc2, %f0, %f8
-	fbl,pn	%fcc2, 1f
-	 nop
-8:	retl
-	 fsqrtd	%f0, %f0
-1:
-#ifdef SHARED
-	SETUP_PIC_REG_LEAF(o5, g1)
-	sethi	%gdop_hix22(_LIB_VERSION), %g1
-	xor	%g1, %gdop_lox10(_LIB_VERSION), %g1
-	ldx	[%o5 + %g1], %g1, %gdop(_LIB_VERSION)
-#else
-	sethi	%hi(_LIB_VERSION), %g1
-	or	%g1, %lo(_LIB_VERSION), %g1
-#endif
-	ld	[%g1], %g1
-	cmp	%g1, -1
-	be,pt	%icc, 8b
-	 fmovd	%f0, %f2
-	mov	26, %o2
-	mov	%o7, %g1
-	call	__kernel_standard
-	 mov	%g1, %o7
-END (__sqrt)
-
-weak_alias (__sqrt, sqrt)
diff --git a/sysdeps/sparc/sparc64/fpu/w_sqrtf_compat.S b/sysdeps/sparc/sparc64/fpu/w_sqrtf_compat.S
deleted file mode 100644
index 875ed3b3b2..0000000000
--- a/sysdeps/sparc/sparc64/fpu/w_sqrtf_compat.S
+++ /dev/null
@@ -1,49 +0,0 @@
-/* sqrtf function.  sparc64 version.
-   Copyright (C) 2012-2017 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-svid-compat.h>
-
-ENTRY (__sqrtf)
-	fzeros	%f8
-	fcmps	%fcc2, %f1, %f8
-	fbl,pn	%fcc2, 1f
-	 nop
-8:	retl
-	 fsqrts	%f1, %f0
-1:
-#ifdef SHARED
-	SETUP_PIC_REG_LEAF(o5, g1)
-	sethi	%gdop_hix22(_LIB_VERSION), %g1
-	xor	%g1, %gdop_lox10(_LIB_VERSION), %g1
-	ldx	[%o5 + %g1], %g1, %gdop(_LIB_VERSION)
-#else
-	sethi	%hi(_LIB_VERSION), %g1
-	or	%g1, %lo(_LIB_VERSION), %g1
-#endif
-	ld	[%g1], %g1
-	cmp	%g1, -1
-	be,pt	%icc, 8b
-	 fmovs	%f1, %f3
-	mov	126, %o2
-	mov	%o7, %g1
-	call	__kernel_standard_f
-	 mov	%g1, %o7
-END (__sqrtf)
-
-weak_alias (__sqrtf, sqrtf)