sparc: refactor sparc64 signbit{f} selector to C

This patch refactors the sparc64 ifunc selector to a C implementation.
Also, the generic symbol is moved to its own implementation file
(s_signbit{f}-generic.S).

It also simplifies the multiarch Makefile by moving the common objects
from libm-sysdeps_routines and sysdeps_routines to a new sysdeps_call
rule and including it where required with the correct prefix.

Checked on sparc64-linux-gnu and sparcv9-linux-gnu.

	* sysdeps/sparc/sparc-ifunc.h (sparc_libm_ifunc_redirected): New
	macro.
	* sysdeps/sparc/sparc64/fpu/multiarch/Makefile (sysdep_calls): New
	rule.
	(sysdep_routines): Use sysdep_calls as base.
	(libm-sysdep_routines): Add generic rule for symbols shared with
	libc.  Add s_signbit-generic and s_signbitf-generic objects.
	* sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.c: New file.
	* sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.c: Likewise.
	* sysdeps/sparc/sparc64/fpu/multiarch/s_signbit-generic.S: Likewise.
	* sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf-generic.S: Likewise.
	* sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.S: Remove file.
	* sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.S: Likewise.

Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

7 files changed, 85 insertions, 38 deletions

diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/Makefile b/sysdeps/sparc/sparc64/fpu/multiarch/Makefile
index 2ac449672a..702452cbde 100644
--- a/sysdeps/sparc/sparc64/fpu/multiarch/Makefile
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/Makefile
@@ -1,17 +1,21 @@
 ifeq ($(subdir),math)
-libm-sysdep_routines += m_signbitf-vis3 m_signbit-vis3 m_finitef-vis3 \
-			m_finite-vis3 m_isinff-vis3 m_isinf-vis3 \
-			m_isnanf-vis3 m_isnan-vis3 s_lrintf-vis3 \
-			s_lrint-vis3 s_rintf-vis3 s_rint-vis3 \
+# These functions are built both for libc and libm because they're required
+# by printf.  While the libc objects have the prefix s_, the libm ones are
+# prefixed with  m_.
+sysdep_calls := s_signbitf-vis3 s_signbit-vis3 s_signbitf-generic \
+		s_signbit-generic s_finitef-vis3 \
+		s_finite-vis3 s_isinff-vis3 s_isinf-vis3 \
+		s_isnanf-vis3 s_isnan-vis3
+
+sysdep_routines += $(sysdep_calls)
+libm-sysdep_routines += s_lrintf-vis3 s_lrint-vis3 s_rintf-vis3 s_rint-vis3 \
 			s_fmaf-vis3 s_fma-vis3 s_fmaf-generic s_fma-generic \
 			s_nearbyint-vis3 s_nearbyintf-vis3 \
 			s_ceilf-vis3 s_ceil-vis3 s_ceilf-generic \
 			s_ceil-generic s_floorf-vis3 s_floor-vis3 \
 			s_floorf-generic s_floor-generic s_truncf-vis3 \
-			s_trunc-vis3 s_truncf-generic s_trunc-generic
-sysdep_routines += s_signbitf-vis3 s_signbit-vis3 s_finitef-vis3 \
-		   s_finite-vis3 s_isinff-vis3 s_isinf-vis3 \
-		   s_isnanf-vis3 s_isnan-vis3
+			s_trunc-vis3 s_truncf-generic s_trunc-generic \
+			$(sysdep_calls:s_%=m_%)
 
 CFLAGS-s_ceilf-vis3.c += -Wa,-Av9d -mvis3
 CFLAGS-s_ceil-vis3.c += -Wa,-Av9d -mvis3
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit-generic.S b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit-generic.S
new file mode 100644
index 0000000000..dfa40aca8f
--- /dev/null
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit-generic.S
@@ -0,0 +1,6 @@
+#define __signbit __signbit_generic
+#undef strong_alias
+#define strong_alias(a, b)
+#undef hidden_def
+#define hidden_def(a)
+#include <sysdeps/sparc/sparc64/fpu/s_signbit.S>
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.S b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.S
deleted file mode 100644
index b8ff64a547..0000000000
--- a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.S
+++ /dev/null
@@ -1,20 +0,0 @@
-#include <sparc-ifunc.h>
-
-SPARC_ASM_VIS3_IFUNC(signbit)
-
-/* On 64-bit the double version will also always work for
-   long-double-precision since in both cases the word with the
-   sign bit in it is passed always in register %f0.  */
-strong_alias (__signbit, __signbitl)
-hidden_def (__signbitl)
-
-# undef weak_alias
-# define weak_alias(a, b)
-# undef strong_alias
-# define strong_alias(a, b)
-# undef hidden_def
-# define hidden_def(a)
-
-#define __signbit __signbit_generic
-
-#include "../s_signbit.S"
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.c b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.c
new file mode 100644
index 0000000000..47596bc601
--- /dev/null
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbit.c
@@ -0,0 +1,37 @@
+/* signbit ifunc resolver, Linux/sparc64 version.
+   Copyright (C) 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/>.  */
+
+#define __signbit __redirect_signbit
+#include <math.h>
+#undef __signbit
+
+#include <sparc-ifunc.h>
+
+extern __typeof (__redirect_signbit) __signbit_vis3 attribute_hidden;
+extern __typeof (__redirect_signbit) __signbit_generic attribute_hidden;
+
+sparc_libm_ifunc_redirected (__redirect_signbit, __signbit,
+			     hwcap & HWCAP_SPARC_VIS3
+			     ? __signbit_vis3
+			     : __signbit_generic);
+
+/* On 64-bit the double version will also always work for
+   long-double-precision since in both cases the word with the
+   sign bit in it is passed always in register %f0.  */
+strong_alias (__signbit, __signbitl)
+sparc_ifunc_redirected_hidden_def (__redirect_signbit, __signbitl)
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf-generic.S b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf-generic.S
new file mode 100644
index 0000000000..851ff350d1
--- /dev/null
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf-generic.S
@@ -0,0 +1,2 @@
+#define __signbitf __signbitf_generic
+#include <sysdeps/sparc/sparc64/fpu/s_signbitf.S>
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.S b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.S
deleted file mode 100644
index d57e999b90..0000000000
--- a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.S
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <sparc-ifunc.h>
-
-SPARC_ASM_VIS3_IFUNC(signbitf)
-
-# undef weak_alias
-# define weak_alias(a, b)
-
-#define __signbitf __signbitf_generic
-
-#include "../s_signbitf.S"
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.c b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.c
new file mode 100644
index 0000000000..85a97ce9ef
--- /dev/null
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/s_signbitf.c
@@ -0,0 +1,28 @@
+/* signbit ifunc resolver, Linux/sparc64 version.
+   Copyright (C) 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 <math.h>
+#include <sparc-ifunc.h>
+
+extern int __signbitf_vis3 (float) attribute_hidden;
+extern int __signbitf_generic (float) attribute_hidden;
+
+sparc_libm_ifunc(__signbitf,
+		 hwcap & HWCAP_SPARC_VIS3
+		 ? __signbitf_vis3
+		 : __signbitf_generic);