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[PATCH 04/05] Math optimizations for POWER8

From: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
To: "GNU C. Library" <libc-alpha at sourceware dot org>
Date: Tue, 18 Feb 2014 11:47:29 -0300
Subject: [PATCH 04/05] Math optimizations for POWER8
Authentication-results: sourceware.org; auth=none
References: <53036FF8 dot 5020109 at linux dot vnet dot ibm dot com>

This patch add a optimized llrint/llrintf implementation for POWER8
using the new Move From VSR Doubleword instruction to gains some
cycles from FP to GRP register move.

---

2014-02-17  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

        * sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Add llrint power8
	implementation.
        * sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-power8.S: New file:
	POWER8 llrint ifunc implementation.
        * sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint.c (__lllrint): Add
	POWER8 implementation.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S: New file:
	POWER8 llrint implementation.

--

diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
index 52bbd4b..f882478 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
@@ -23,7 +23,8 @@ libm-sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
 			s_logbl-ppc64 s_modf-power5+ s_modf-ppc64 \
 			s_modff-power5+ s_modff-ppc64 e_hypot-ppc64 \
 			e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7 \
-			s_isnan-power8 s_isinf-power8 s_finite-power8
+			s_isnan-power8 s_isinf-power8 s_finite-power8 \
+			s_llrint-power8
 
 CFLAGS-s_logbf-power7.c = -mcpu=power7
 CFLAGS-s_logbl-power7.c = -mcpu=power7
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-power8.S b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-power8.S
new file mode 100644
index 0000000..86d9378
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint-power8.S
@@ -0,0 +1,31 @@
+/* Round double to long int.  PowerPC64/POWER6X default version.
+   Copyright (C) 2013 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_ldbl_opt.h>
+
+#undef weak_alias
+#define weak_alias(a,b)
+#undef strong_alias
+#define strong_alias(a,b)
+#undef compat_symbol
+#define compat_symbol(a,b,c,d)
+
+#define __llrint __llrint_power8
+
+#include <sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint.c
index 5818b53..cf1b2e4 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrint.c
@@ -30,10 +30,13 @@
 
 extern __typeof (__llrint) __llrint_ppc64 attribute_hidden;
 extern __typeof (__llrint) __llrint_power6x attribute_hidden;
+extern __typeof (__llrint) __llrint_power8 attribute_hidden;
 
 libc_ifunc (__llrint,
-	    (hwcap & PPC_FEATURE_POWER6_EXT)
-	    ? __llrint_power6x
+	    (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+	    ? __llrint_power8 :
+	      (hwcap & PPC_FEATURE_POWER6_EXT)
+	      ? __llrint_power6x
             : __llrint_ppc64);
 
 weak_alias (__llrint, llrint)
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S
new file mode 100644
index 0000000..29fe63e
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S
@@ -0,0 +1,44 @@
+/* Round double to long int.  POWER8 PowerPC64 version.
+   Copyright (C) 2013 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_ldbl_opt.h>
+
+/* long long int[r3] __llrint (double x[fp1])  */
+	.machine	"power8"
+ENTRY (__llrint)
+	CALL_MCOUNT 0
+	fctid	fp2,fp1
+	mfvsrd  r3,v2
+	blr
+END (__llrint)
+
+strong_alias (__llrint, __lrint)
+weak_alias (__llrint, llrint)
+weak_alias (__lrint, lrint)
+
+#ifdef NO_LONG_DOUBLE
+strong_alias (__llrint, __llrintl)
+weak_alias (__llrint, llrintl)
+strong_alias (__lrint, __lrintl)
+weak_alias (__lrint, lrintl)
+#endif
+#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
+compat_symbol (libm, __llrint, llrintl, GLIBC_2_1)
+compat_symbol (libm, __lrint, lrintl, GLIBC_2_1)
+#endif

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