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Add SSE4.1 trunc, truncf (bug 20142).

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This patch adds SSE4.1 versions of trunc and truncf, using the roundsd
/ roundss instructions, similar to the versions of ceil, floor, rint
and nearbyint functions we already have.  In my testing with the glibc
benchtests these are about 30% faster than the C versions for double,
20% faster for float.

Tested for x86_64.

	[BZ #20142]
	* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
	Add s_trunc-c, s_truncf-c, s_trunc-sse4_1 and s_truncf-sse4_1.
	* sysdeps/x86_64/fpu/multiarch/s_trunc-c.c: New file.
	* sysdeps/x86_64/fpu/multiarch/s_trunc-sse4_1.S: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_trunc.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_truncf-c.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_truncf-sse4_1.S: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_truncf.c: Likewise.
This commit is contained in:
Joseph Myers 2017-09-20 16:54:05 +00:00
parent a856d4d4a8
commit ae8372d7e4
9 changed files with 130 additions and 2 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2017-09-20 Joseph Myers <joseph@codesourcery.com>
[BZ #20142]
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
Add s_trunc-c, s_truncf-c, s_trunc-sse4_1 and s_truncf-sse4_1.
* sysdeps/x86_64/fpu/multiarch/s_trunc-c.c: New file.
* sysdeps/x86_64/fpu/multiarch/s_trunc-sse4_1.S: Likewise.
* sysdeps/x86_64/fpu/multiarch/s_trunc.c: Likewise.
* sysdeps/x86_64/fpu/multiarch/s_truncf-c.c: Likewise.
* sysdeps/x86_64/fpu/multiarch/s_truncf-sse4_1.S: Likewise.
* sysdeps/x86_64/fpu/multiarch/s_truncf.c: Likewise.
2017-09-20 Paul Pluzhnikov <ppluzhnikov@google.com>
Ricky Zhou <rickyz@google.com>
Anoop V Chakkalakkal <anoop.vijayan@in.ibm.com>

2
NEWS
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@ -12,6 +12,8 @@ Major new features:
* Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin and tan
with FMA, contributed by Arjan van de Ven and H.J. Lu from Intel.
* Optimized x86-64 trunc and truncf for processors with SSE4.1.
* In order to support faster and safer process termination the malloc API
family of functions will no longer print a failure address and stack
backtrace after detecting heap corruption. The goal is to minimize the

6
sysdeps/x86_64/fpu/multiarch/Makefile
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@ -1,10 +1,12 @@
ifeq ($(subdir),math)
libm-sysdep_routines += s_floor-c s_ceil-c s_floorf-c s_ceilf-c \
s_rint-c s_rintf-c s_nearbyint-c s_nearbyintf-c
s_rint-c s_rintf-c s_nearbyint-c s_nearbyintf-c \
s_trunc-c s_truncf-c
libm-sysdep_routines += s_ceil-sse4_1 s_ceilf-sse4_1 s_floor-sse4_1 \
s_floorf-sse4_1 s_nearbyint-sse4_1 \
s_nearbyintf-sse4_1 s_rint-sse4_1 s_rintf-sse4_1
s_nearbyintf-sse4_1 s_rint-sse4_1 s_rintf-sse4_1 \
s_trunc-sse4_1 s_truncf-sse4_1
libm-sysdep_routines += e_exp-fma e_log-fma e_pow-fma s_atan-fma \
e_asin-fma e_atan2-fma s_sin-fma s_tan-fma \

2
sysdeps/x86_64/fpu/multiarch/s_trunc-c.c Normal file
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@ -0,0 +1,2 @@
#define __trunc __trunc_c
#include <sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c>

25
sysdeps/x86_64/fpu/multiarch/s_trunc-sse4_1.S Normal file
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@ -0,0 +1,25 @@
/* trunc for SSE4.1.
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/>. */
#include <sysdep.h>
.section .text.sse4.1,"ax",@progbits
ENTRY(__trunc_sse41)
roundsd $11, %xmm0, %xmm0
ret
END(__trunc_sse41)

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sysdeps/x86_64/fpu/multiarch/s_trunc.c Normal file
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@ -0,0 +1,29 @@
/* Multiple versions of __trunc.
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/>. */
#define trunc __redirect_trunc
#define __trunc __redirect___trunc
#include <math.h>
#undef trunc
#undef __trunc
#define SYMBOL_NAME trunc
#include "ifunc-sse4_1.h"
libc_ifunc_redirected (__redirect_trunc, __trunc, IFUNC_SELECTOR ());
weak_alias (__trunc, trunc)

2
sysdeps/x86_64/fpu/multiarch/s_truncf-c.c Normal file
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@ -0,0 +1,2 @@
#define __truncf __truncf_c
#include <sysdeps/ieee754/flt-32/s_truncf.c>

25
sysdeps/x86_64/fpu/multiarch/s_truncf-sse4_1.S Normal file
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@ -0,0 +1,25 @@
/* truncf for SSE4.1.
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/>. */
#include <sysdep.h>
.section .text.sse4.1,"ax",@progbits
ENTRY(__truncf_sse41)
roundss $11, %xmm0, %xmm0
ret
END(__truncf_sse41)

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sysdeps/x86_64/fpu/multiarch/s_truncf.c Normal file
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@ -0,0 +1,29 @@
/* Multiple versions of __truncf.
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/>. */
#define truncf __redirect_truncf
#define __truncf __redirect___truncf
#include <math.h>
#undef truncf
#undef __truncf
#define SYMBOL_NAME truncf
#include "ifunc-sse4_1.h"
libc_ifunc_redirected (__redirect_truncf, __truncf, IFUNC_SELECTOR ());
weak_alias (__truncf, truncf)