powerpc: Refactor powerpc64 lround/lroundf/llround/llroundf

This patches consolidates all the powerpc {l}lround{f} implementations
on the generic sysdeps/powerpc/fpu/s_{l}lround{f}.c.

The IFUNC support is also moved only to powerpc64 only, since for
powerpc64le generic implementation resulting in optimized code.

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/powerpc64/be/fpu/multiarch/Makefile
	(libm-sysdep_routines): Add s_llround-power8, s_llround-power6x,
	s_llround-power5+, s_llround-ppc64, and s_llroundf-ppc64.
	(CFLAGS-s_llround-power8.c, CFLAGS-s_llround-power6x.c,
	CFLAGS-s_llround-power5+.c): New rule.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power5+.c:
	New file.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power6x.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power8.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-ppc64.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf-ppc64.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround.c: ... here.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llroundf.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf.c: ... here.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_lround.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lround.c: ... here.
	* sysdeps/powerpc/powerpc64/fpu/Makefile
	[$(subdir) == math] (CFLAGS-s_llround.c): New rule.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
	(libm-sysdep_routines): Remove s_llround-* objects.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround-power5+.S: Remove
	file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround-power6x.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround-power8.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround-ppc64.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llroundf-ppc64.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_llround.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_llroundf.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lround.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lroundf.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_llround.c: New file.
	* sysdeps/powerpc/powerpc64/fpu/s_llroundf.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lround.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lroundf.c: Likewise.
	* sysdeps/powerpc/powerpc64/power5+/fpu/s_llround.S: Likewise.
	* sysdeps/powerpc/powerpc64/power5+/fpu/s_llroundf.S: Likewise.
	* sysdeps/powerpc/powerpc64/power6x/fpu/s_llround.S: Likewise.
	* sysdeps/powerpc/powerpc64/power6x/fpu/s_llroundf.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_llroundf.S: Likewise.

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

9 files changed, 115 insertions, 1 deletions

diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
index febda6dbb3..f542e89520 100644
--- a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
@@ -17,7 +17,12 @@ libm-sysdep_routines += s_ceil-power5+ \
 			s_truncf-ppc64 \
 			s_llrint-power8 \
 			s_llrint-power6x \
-			s_llrint-ppc64
+			s_llrint-ppc64 \
+			s_llround-power8 \
+			s_llround-power6x \
+			s_llround-power5+ \
+			s_llround-ppc64 \
+			s_llroundf-ppc64
 
 CFLAGS-s_ceil-power5+.c = -mcpu=power5+
 CFLAGS-s_ceilf-power5+.c = -mcpu=power5+
@@ -29,4 +34,7 @@ CFLAGS-s_trunc-power5+.c = -mcpu=power5+
 CFLAGS-s_truncf-power5+.c = -mcpu=power5+
 CFLAGS-s_llrint-power8.c += -mcpu=power8
 CFLAGS-s_llrint-power6x.c += -mcpu=power6x
+CFLAGS-s_llround-power8.c += -mcpu=power8
+CFLAGS-s_llround-power6x.c += -mcpu=power6x
+CFLAGS-s_llround-power5+.c += -mcpu=power5+
 endif
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power5+.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power5+.c
new file mode 100644
index 0000000000..182132b825
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power5+.c
@@ -0,0 +1,2 @@
+#define __llround __llround_power5plus
+#include <sysdeps/powerpc/powerpc64/fpu/s_llround.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power6x.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power6x.c
new file mode 100644
index 0000000000..542319d56b
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power6x.c
@@ -0,0 +1,2 @@
+#define __llround __llround_power6x
+#include <sysdeps/powerpc/powerpc64/fpu/s_llround.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power8.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power8.c
new file mode 100644
index 0000000000..5d2b3b8d44
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-power8.c
@@ -0,0 +1,2 @@
+#define __llround __llround_power8
+#include <sysdeps/powerpc/powerpc64/fpu/s_llround.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-ppc64.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-ppc64.c
new file mode 100644
index 0000000000..8793bd7814
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround-ppc64.c
@@ -0,0 +1,2 @@
+#define __llround __llround_ppc64
+#include <sysdeps/powerpc/powerpc64/fpu/s_llround.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround.c
new file mode 100644
index 0000000000..173c0d38ad
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llround.c
@@ -0,0 +1,48 @@
+/* Multiple versions of llround.
+   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 lround __hidden_lround
+#define __lround __hidden___lround
+
+#include <math.h>
+#include <math_ldbl_opt.h>
+#include <shlib-compat.h>
+#include "init-arch.h"
+#include <libm-alias-double.h>
+
+extern __typeof (__llround) __llround_ppc64 attribute_hidden;
+extern __typeof (__llround) __llround_power5plus attribute_hidden;
+extern __typeof (__llround) __llround_power6x attribute_hidden;
+extern __typeof (__llround) __llround_power8 attribute_hidden;
+
+libc_ifunc (__llround,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __llround_power8 :
+	      (hwcap & PPC_FEATURE_POWER6_EXT)
+	      ? __llround_power6x :
+		(hwcap & PPC_FEATURE_POWER5_PLUS)
+		? __llround_power5plus
+            : __llround_ppc64);
+
+libm_alias_double (__llround, llround)
+
+/* long has the same width as long long on PPC64.  */
+#undef lround
+#undef __lround
+strong_alias (__llround, __lround)
+libm_alias_double (__lround, lround)
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf-ppc64.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf-ppc64.c
new file mode 100644
index 0000000000..dba4c654db
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf-ppc64.c
@@ -0,0 +1,2 @@
+#define __llroundf __llroundf_ppc64
+#include <sysdeps/powerpc/powerpc64/fpu/s_llroundf.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf.c
new file mode 100644
index 0000000000..eba9f5ca3e
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llroundf.c
@@ -0,0 +1,47 @@
+/* Multiple versions of llroundf.
+   Copyright (C) 2017-2019 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/>.  */
+/* Redefine lroundf/__lroundf so that the compiler won't complain about
+   the type mismatch with the IFUNC selector in strong_alias below.  */
+#define lroundf __hidden_lroundf
+#define __lroundf __hidden___lroundf
+
+#include <math.h>
+#undef lroundf
+#undef __lroundf
+#include "init-arch.h"
+#include <libm-alias-float.h>
+
+extern __typeof (__llroundf) __llroundf_ppc64 attribute_hidden;
+extern __typeof (__llroundf) __llround_power6x attribute_hidden;
+extern __typeof (__llroundf) __llround_power8 attribute_hidden;
+
+/* The ppc64 ABI passes float and double parameters in 64bit floating point
+   registers (at least up to a point) as IEEE binary64 format, so effectively
+   of "double" type.  Both l[l]round and l[l]roundf return long type.  So these
+   functions have identical signatures and functionality, and can use a
+   single implementation.  */
+libc_ifunc (__llroundf,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __llround_power8 :
+	    (hwcap & PPC_FEATURE_POWER6_EXT)
+	    ? __llround_power6x
+	    : __llroundf_ppc64);
+
+libm_alias_float (__llround, llround)
+strong_alias (__llroundf, __lroundf)
+libm_alias_float (__lround, lround)
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lround.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lround.c
new file mode 100644
index 0000000000..0dab5443e2
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lround.c
@@ -0,0 +1 @@
+/* __lround is in s_llround.c  */