powerpc: refactor powerpc64 lrint/lrintf/llrint/llrintf

This patches consolidates all the powerpc llrint{f} implementations on
the generic sysdeps/powerpc/fpu/s_llrint{f}.

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_llrint-power8, s_llrint-power6x, and
	s_llrint-ppc64.
	(CFLAGS-s_llrint-power8.c, CFLAGS-s_llrint-power6x.c): New rule.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power6x.c: New
	file.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power8.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-ppc64.c:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_lrint.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lrint.c: ... here.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint.c: ... here.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrintf.c: Move to ...
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrintf.c: ... here.
	* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lrint.c: New file.
	* sysdeps/powerpc/powerpc64/fpu/Makefile: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
	(libm-sysdep_routines): Remove s_llrint-* objects.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-power6x.S: Remove
	file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-power8.S:
	Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-ppc64.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_llrint.c: New file.
	* sysdeps/powerpc/powerpc64/fpu/s_llrintf.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lrint.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lrintf.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_llrint.S: Remove file.
	* sysdeps/powerpc/powerpc64/fpu/s_llrintf.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_lrint.S: Likewise.
	* sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S: Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S: Likewise.

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

7 files changed, 107 insertions, 1 deletions

diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
index 53e600f5f6..febda6dbb3 100644
--- a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
@@ -14,7 +14,10 @@ libm-sysdep_routines += s_ceil-power5+ \
 			s_trunc-power5+ \
 			s_trunc-ppc64 \
 			s_truncf-power5+ \
-			s_truncf-ppc64
+			s_truncf-ppc64 \
+			s_llrint-power8 \
+			s_llrint-power6x \
+			s_llrint-ppc64
 
 CFLAGS-s_ceil-power5+.c = -mcpu=power5+
 CFLAGS-s_ceilf-power5+.c = -mcpu=power5+
@@ -24,4 +27,6 @@ CFLAGS-s_round-power5+.c = -mcpu=power5+
 CFLAGS-s_roundf-power5+.c = -mcpu=power5+
 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
 endif
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power6x.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power6x.c
new file mode 100644
index 0000000000..ee139b4045
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power6x.c
@@ -0,0 +1,2 @@
+#define __llrint __llrint_power6x
+#include <sysdeps/powerpc/powerpc64/fpu/s_llrint.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power8.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power8.c
new file mode 100644
index 0000000000..0f5cbff69a
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-power8.c
@@ -0,0 +1,2 @@
+#define __llrint __llrint_power8
+#include <sysdeps/powerpc/powerpc64/fpu/s_llrint.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-ppc64.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-ppc64.c
new file mode 100644
index 0000000000..40f212716b
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint-ppc64.c
@@ -0,0 +1,2 @@
+#define __llrint  __llrint_ppc64
+#include <sysdeps/powerpc/powerpc64/fpu/s_llrint.c>
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint.c
new file mode 100644
index 0000000000..f2841c97d3
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrint.c
@@ -0,0 +1,47 @@
+/* Multiple versions of llrint.
+   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/>.  */
+
+/* Redefine lrint/__lrint so that the compiler won't complain about the type
+   mismatch with the IFUNC selector in strong_alias below.  */
+#define lrint __hidden_lrint
+#define __lrint __hidden___lrint
+
+#include <math.h>
+#include <math_ldbl_opt.h>
+#undef lrint
+#undef __lrint
+#include <shlib-compat.h>
+#include "init-arch.h"
+#include <libm-alias-double.h>
+
+extern __typeof (__llrint) __llrint_ppc64 attribute_hidden;
+extern __typeof (__llrint) __llrint_power6x attribute_hidden;
+extern __typeof (__llrint) __llrint_power8 attribute_hidden;
+
+libc_ifunc (__llrint,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __llrint_power8 :
+	      (hwcap & PPC_FEATURE_POWER6_EXT)
+	      ? __llrint_power6x
+            : __llrint_ppc64);
+
+libm_alias_double (__llrint, llrint)
+
+/* long has the same width as long long on PowerPC64.  */
+strong_alias (__llrint, __lrint)
+libm_alias_double (__lrint, lrint)
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrintf.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrintf.c
new file mode 100644
index 0000000000..15ee159748
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_llrintf.c
@@ -0,0 +1,47 @@
+/* Multiple versions of llrintf.
+   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 lrintf/__lrintf so that the compiler won't complain about the type
+   mismatch with the IFUNC selector in strong_alias below.  */
+#define lrintf __hidden_lrintf
+#define __lrintf __hidden___lrintf
+
+#include <math.h>
+#undef lrintf
+#undef __lrintf
+#include "init-arch.h"
+#include <libm-alias-float.h>
+
+extern __typeof (__llrintf) __llrint_ppc64 attribute_hidden;
+extern __typeof (__llrintf) __llrint_power6x attribute_hidden;
+extern __typeof (__llrintf) __llrint_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]rint and l[l]rintf return long type.  So these
+   functions have identical signatures and functionality, and can use a
+   single implementation.  */
+libc_ifunc (__llrintf,
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __llrint_power8 :
+	    (hwcap & PPC_FEATURE_POWER6_EXT)
+	    ? __llrint_power6x
+	    : __llrint_ppc64);
+
+libm_alias_float (__llrint, llrint)
+strong_alias (__llrintf, __lrintf)
+libm_alias_float (__lrint, lrint)
diff --git a/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lrint.c b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lrint.c
new file mode 100644
index 0000000000..d09286267b
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_lrint.c
@@ -0,0 +1 @@
+ /* __lrint is in s_llrint.c  */