powerpc: Add multiarch sqrtf128 for ppc64le

This patch creates ifunc for sqrtf128() to make use of new xssqrtqp
instruction for POWER9 when --enable-multi-arch and --with-cpu=power8
options are used on power9 system.  This is achieved by explicitly
adding -mcpu=power9 flag for sqrtf128-power9.

5 files changed, 117 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 7d69df5601..40f398cde4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2018-05-30  Rajalakshmi Srinivasaraghavan  <raji@linux.vnet.ibm.com>
+
+	* sysdeps/powerpc/powerpc64/le/fpu/multiarch/Makefile: New file to
+	add w_sqrtf128-power9 and w_sqrtf128-ppc64le to libm-sysdep_routines.
+	* sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-power9.c:
+	New file.
+	* sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-ppc64le.c:
+	Likewise.
+	* sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128.c: Likewise.
+
 2018-05-29  Florian Weimer  <fweimer@redhat.com>
 
 	* support/Makefile (libsupport-routines): Add
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/Makefile
new file mode 100644
index 0000000000..a32f3d8b81
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/Makefile
@@ -0,0 +1,6 @@
+ifeq ($(subdir),math)
+libm-sysdep_routines += w_sqrtf128-power9 w_sqrtf128-ppc64le
+
+CFLAGS-w_sqrtf128-ppc64le.c += -mfloat128
+CFLAGS-w_sqrtf128-power9.c += -mfloat128 -mcpu=power9
+endif
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-power9.c b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-power9.c
new file mode 100644
index 0000000000..55d93b9256
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-power9.c
@@ -0,0 +1,35 @@
+/* POWER9 sqrt for _Float128
+   Copyright (C) 2018 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.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file into
+   combinations with other programs, and to distribute those
+   combinations without any restriction coming from the use of this
+   file.  (The Lesser General Public License restrictions do apply in
+   other respects; for example, they cover modification of the file,
+   and distribution when not linked into a combine executable.)
+
+   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-type-macros-float128.h>
+
+#define __sqrtf128 __sqrtf128_power9
+
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+
+#include <w_sqrt_template.c>
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-ppc64le.c b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-ppc64le.c
new file mode 100644
index 0000000000..72f09b1017
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128-ppc64le.c
@@ -0,0 +1,35 @@
+/* PPC64LE sqrt for _Float128
+   Copyright (C) 2018 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.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file into
+   combinations with other programs, and to distribute those
+   combinations without any restriction coming from the use of this
+   file.  (The Lesser General Public License restrictions do apply in
+   other respects; for example, they cover modification of the file,
+   and distribution when not linked into a combine executable.)
+
+   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-type-macros-float128.h>
+
+#define __sqrtf128 __sqrtf128_ppc64le
+
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+
+#include <w_sqrt_template.c>
diff --git a/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128.c b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128.c
new file mode 100644
index 0000000000..a44bf4f5cc
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/fpu/multiarch/w_sqrtf128.c
@@ -0,0 +1,31 @@
+/* Multiple versions of __sqrtf128.
+   Copyright (C) 2018 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 NO_MATH_REDIRECT
+#include <math.h>
+#include "init-arch.h"
+#include <math-type-macros-float128.h>
+
+extern __typeof (__sqrtf128) __sqrtf128_ppc64le attribute_hidden;
+extern __typeof (__sqrtf128) __sqrtf128_power9 attribute_hidden;
+
+libc_ifunc (__sqrtf128,
+	    (hwcap2 & PPC_FEATURE2_ARCH_3_00)
+	    ? __sqrtf128_power9
+	    : __sqrtf128_ppc64le);
+declare_mgen_alias (__sqrt, sqrt)