AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-08 14:20:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

[powerpc] get_rounding_mode: utilize faster method to get rounding mode

Browse Source 
Add support to use 'mffsl' instruction if compiled for POWER9 (or later).

Also, mask the result to avoid bleeding unrelated bits into the result of
_FPU_GET_RC().

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Paul A. Clarke 2019-03-15 19:04:24 -04:00
parent 28dd393922
commit de751ebc9e
3 changed files with 68 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
ChangeLog
View File

@ -1,3 +1,12 @@
2019-06-06 Paul A. Clarke <pc@us.ibm.com>
* sysdeps/powerpc/fpu_control.h (_FPU_MASK_RC): New.
(__FPU_MFFS): New.
(__FPU_MFFSL): New.
(_FPU_GET_RC): New.
(_FPU_GETCW): Use __FPU_MFFS().
* sysdeps/powerpc/fpu/get-rounding-mode.h: New file.
2019-06-06 Florian Weimer <fweimer@redhat.com>
* sysdeps/unix/sysv/linux/riscv/flush-icache.c: Do not use

33
sysdeps/powerpc/fpu/get-rounding-mode.h Normal file
View File

@ -0,0 +1,33 @@
/* Determine floating-point rounding mode within libc. powerpc64 version.
Copyright (C) 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/>. */
#ifndef _POWERPC64_GET_ROUNDING_MODE_H
#define _POWERPC64_GET_ROUNDING_MODE_H 1
#include <fenv.h>
#include <fpu_control.h>
/* Return the floating-point rounding mode. */
static inline int
get_rounding_mode (void)
{
return _FPU_GET_RC ();
}
#endif /* get-rounding-mode.h */

29
sysdeps/powerpc/fpu_control.h
View File

@ -40,6 +40,8 @@ extern fpu_control_t __fpu_control;
# define _FPU_RC_UP 0x02
# define _FPU_RC_ZERO 0x01
# define _FPU_MASK_RC (_FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO)
# define _FPU_MASK_NI 0x04 /* non-ieee mode */
/* masking of interrupts */
@ -63,15 +65,36 @@ extern fpu_control_t __fpu_control;
typedef unsigned int fpu_control_t;
/* Macros for accessing the hardware control word. */
# define __FPU_MFFS() \
({register double __fr; \
__asm__ ("mffs %0" : "=f" (__fr)); \
__fr; \
})
# define _FPU_GETCW(cw) \
({union { double __d; unsigned long long __ll; } __u; \
register double __fr; \
__asm__ ("mffs %0" : "=f" (__fr)); \
__u.__d = __fr; \
__u.__d = __FPU_MFFS(); \
(cw) = (fpu_control_t) __u.__ll; \
(fpu_control_t) __u.__ll; \
})
#ifdef _ARCH_PWR9
# define __FPU_MFFSL() \
({register double __fr; \
__asm__ ("mffsl %0" : "=f" (__fr)); \
__fr; \
})
#else
# define __FPU_MFFSL() __FPU_MFFS()
#endif
# define _FPU_GET_RC() \
({union { double __d; unsigned long long __ll; } __u; \
__u.__d = __FPU_MFFSL(); \
__u.__ll &= _FPU_MASK_RC; \
(fpu_control_t) __u.__ll; \
})
# define _FPU_SETCW(cw) \
{ union { double __d; unsigned long long __ll; } __u; \
register double __fr; \