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[PATCHv2] powerpc: Add optimized version of [l]lrintf

From: Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>
To: libc-alpha at sourceware dot org
Cc: Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>
Date: Wed, 14 Jun 2017 22:40:30 +0530
Subject: [PATCHv2] powerpc: Add optimized version of [l]lrintf
Authentication-results: sourceware.org; auth=none

This patch makes use of optimized double version of llrint for single
precision as both the versions return [long] long type.

2017-06-14  Rajalakshmi Srinivasaraghavan  <raji@linux.vnet.ibm.com>

	* sysdeps/powerpc/powerpc64/fpu/s_llrint.S
	(__llrintf): Define as strong alias of __llrint.
	(llrintf):  Define as weak alias of __llrint.
	(__lrintf): Define as strong alias of __llrint.
	(lrintf):  Define as weak alias of __llrint.
	* sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S:  Likewise.
	* sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/s_llrintf.S:  Remove file content.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrintf.c: New file.
---
 .../powerpc/powerpc64/fpu/multiarch/s_llrintf.c    | 46 ++++++++++++++++++++++
 sysdeps/powerpc/powerpc64/fpu/s_llrint.S           |  7 ++++
 sysdeps/powerpc/powerpc64/fpu/s_llrintf.S          | 37 +----------------
 sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S   |  7 ++++
 sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S    |  7 ++++
 5 files changed, 68 insertions(+), 36 deletions(-)
 create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrintf.c

diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrintf.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrintf.c
new file mode 100644
index 0000000..330fe96
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_llrintf.c
@@ -0,0 +1,46 @@
+/* Multiple versions of llrintf.
+   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/>.  */
+/* 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"
+
+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);
+
+weak_alias (__llrintf, llrintf)
+strong_alias (__llrintf, __lrintf)
+weak_alias (__lrintf, lrintf)
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llrint.S b/sysdeps/powerpc/powerpc64/fpu/s_llrint.S
index 6893285..9fe0b22 100644
--- a/sysdeps/powerpc/powerpc64/fpu/s_llrint.S
+++ b/sysdeps/powerpc/powerpc64/fpu/s_llrint.S
@@ -34,6 +34,13 @@ ENTRY_TOCLESS (__llrint)
 strong_alias (__llrint, __lrint)
 weak_alias (__llrint, llrint)
 weak_alias (__lrint, lrint)
+/* The double version also works for single-precision as both float and
+   double parameters are passed in 64bit FPRs and both versions are expected
+   to return [long] long type.  */
+strong_alias (__llrint, __llrintf)
+weak_alias (__llrint, llrintf)
+strong_alias (__lrint, __lrintf)
+weak_alias (__lrint, lrintf)
 
 #ifdef NO_LONG_DOUBLE
 strong_alias (__llrint, __llrintl)
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llrintf.S b/sysdeps/powerpc/powerpc64/fpu/s_llrintf.S
index 95d437e..ba77523 100644
--- a/sysdeps/powerpc/powerpc64/fpu/s_llrintf.S
+++ b/sysdeps/powerpc/powerpc64/fpu/s_llrintf.S
@@ -1,36 +1 @@
-/* Round double to long int.  PowerPC64 version.
-   Copyright (C) 2004-2017 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 <sysdep.h>
-
-/* long long int[r3] __llrintf (float x[fp1])  */
-ENTRY_TOCLESS (__llrintf)
-	CALL_MCOUNT 0
-	fctid	fp13,fp1
-	stfd	fp13,-16(r1)
-	nop	/* Insure the following load is in a different dispatch group */
-	nop	/* to avoid pipe stall on POWER4&5.  */
-	nop
-	ld	r3,-16(r1)
-	blr
-	END (__llrintf)
-
-strong_alias (__llrintf, __lrintf)
-weak_alias (__llrintf, llrintf)
-weak_alias (__lrintf, lrintf)
-
+/* __llrintf is in s_llrint.S.  */
diff --git a/sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S b/sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S
index f60d62f..61abdd1 100644
--- a/sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S
+++ b/sysdeps/powerpc/powerpc64/power6x/fpu/s_llrint.S
@@ -31,6 +31,13 @@ ENTRY_TOCLESS (__llrint)
 strong_alias (__llrint, __lrint)
 weak_alias (__llrint, llrint)
 weak_alias (__lrint, lrint)
+/* The double version also works for single-precision as both float and
+   double parameters are passed in 64bit FPRs and both versions are expected
+   to return [long] long type.  */
+strong_alias (__llrint, __llrintf)
+weak_alias (__llrint, llrintf)
+strong_alias (__lrint, __lrintf)
+weak_alias (__lrint, lrintf)
 
 #ifdef NO_LONG_DOUBLE
 strong_alias (__llrint, __llrintl)
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S
index 6980abc..f1476de 100644
--- a/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S
+++ b/sysdeps/powerpc/powerpc64/power8/fpu/s_llrint.S
@@ -32,6 +32,13 @@ END (__llrint)
 strong_alias (__llrint, __lrint)
 weak_alias (__llrint, llrint)
 weak_alias (__lrint, lrint)
+/* The double version also works for single-precision as both float and
+   double parameters are passed in 64bit FPRs and both versions are expected
+   to return [long] long type.  */
+strong_alias (__llrint, __llrintf)
+weak_alias (__llrint, llrintf)
+strong_alias (__lrint, __lrintf)
+weak_alias (__lrint, lrintf)
 
 #ifdef NO_LONG_DOUBLE
 strong_alias (__llrint, __llrintl)
-- 
2.7.4

Follow-Ups:
- Re: [PATCHv2] powerpc: Add optimized version of [l]lrintf
  - From: Tulio Magno Quites Machado Filho

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