Add an fenv.h implementation for the amd64 port.
Reviewed by: standards@
This commit is contained in:
David Schultz
parent
7993050251
commit
fc27daefcd
131
lib/msun/amd64/fenv.c
Normal file
131
lib/msun/amd64/fenv.c
Normal file
@ -0,0 +1,131 @@
|
||||
/*-
|
||||
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
#include <sys/types.h>
|
||||
#include <machine/fpu.h>
|
||||
#include <fenv.h>
|
||||
|
||||
const fenv_t __fe_dfl_env = {
|
||||
{ 0xffff0000 | __INITIAL_FPUCW__,
|
||||
0xffff0000,
|
||||
0xffffffff,
|
||||
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff }
|
||||
},
|
||||
__INITIAL_MXCSR__
|
||||
};
|
||||
|
||||
int
|
||||
fesetexceptflag(const fexcept_t *flagp, int excepts)
|
||||
{
|
||||
fenv_t env;
|
||||
|
||||
__fnstenv(&env.__x87);
|
||||
env.__x87.__status &= ~excepts;
|
||||
env.__x87.__status |= *flagp & excepts;
|
||||
__fldenv(env.__x87);
|
||||
|
||||
__stmxcsr(&env.__mxcsr);
|
||||
env.__mxcsr &= ~excepts;
|
||||
env.__mxcsr |= *flagp & excepts;
|
||||
__ldmxcsr(env.__mxcsr);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
feraiseexcept(int excepts)
|
||||
{
|
||||
fexcept_t ex = excepts;
|
||||
|
||||
fesetexceptflag(&ex, excepts);
|
||||
__fwait();
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
fegetenv(fenv_t *envp)
|
||||
{
|
||||
int control;
|
||||
|
||||
/*
|
||||
* fnstenv masks all exceptions, so we need to save and
|
||||
* restore the control word to avoid this side effect.
|
||||
*/
|
||||
__fnstcw(&control);
|
||||
__fnstenv(&envp->__x87);
|
||||
__stmxcsr(&envp->__mxcsr);
|
||||
__fldcw(control);
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
feholdexcept(fenv_t *envp)
|
||||
{
|
||||
int mxcsr;
|
||||
|
||||
__stmxcsr(&mxcsr);
|
||||
__fnstenv(&envp->__x87);
|
||||
__fnclex();
|
||||
envp->__mxcsr = mxcsr;
|
||||
mxcsr &= FE_ALL_EXCEPT;
|
||||
mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
|
||||
__ldmxcsr(mxcsr);
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
feupdateenv(const fenv_t *envp)
|
||||
{
|
||||
int mxcsr, status;
|
||||
|
||||
__fnstsw(&status);
|
||||
__stmxcsr(&mxcsr);
|
||||
fesetenv(envp);
|
||||
feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT);
|
||||
return (0);
|
||||
}
|
||||
|
||||
int
|
||||
__fesetmask(int mask)
|
||||
{
|
||||
int mxcsr, control, omask;
|
||||
|
||||
__fnstcw(&control);
|
||||
__stmxcsr(&mxcsr);
|
||||
omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
|
||||
control = (control | FE_ALL_EXCEPT) & ~mask;
|
||||
__fldcw(control);
|
||||
mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
|
||||
mxcsr &= ~(mask << _SSE_EMASK_SHIFT);
|
||||
__ldmxcsr(mxcsr);
|
||||
return (~omask);
|
||||
}
|
||||
|
||||
__weak_reference(__fesetmask, fesetmask);
|
||||
202
lib/msun/amd64/fenv.h
Normal file
202
lib/msun/amd64/fenv.h
Normal file
@ -0,0 +1,202 @@
|
||||
/*-
|
||||
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifndef _FENV_H_
|
||||
#define _FENV_H_
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
#include <sys/_types.h>
|
||||
|
||||
typedef struct {
|
||||
struct {
|
||||
__uint32_t __control;
|
||||
__uint32_t __status;
|
||||
__uint32_t __tag;
|
||||
char __other[16];
|
||||
} __x87;
|
||||
__uint32_t __mxcsr;
|
||||
} fenv_t;
|
||||
|
||||
typedef __uint16_t fexcept_t;
|
||||
|
||||
/* Exception flags */
|
||||
#define FE_INVALID 0x01
|
||||
#define FE_DENORMAL 0x02
|
||||
#define FE_DIVBYZERO 0x04
|
||||
#define FE_OVERFLOW 0x08
|
||||
#define FE_UNDERFLOW 0x10
|
||||
#define FE_INEXACT 0x20
|
||||
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
|
||||
FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
|
||||
|
||||
/* Rounding modes */
|
||||
#define FE_TONEAREST 0x0000
|
||||
#define FE_DOWNWARD 0x0400
|
||||
#define FE_UPWARD 0x0800
|
||||
#define FE_TOWARDZERO 0x0c00
|
||||
#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
|
||||
FE_UPWARD | FE_TOWARDZERO)
|
||||
|
||||
/*
|
||||
* As compared to the x87 control word, the SSE unit's control word
|
||||
* has the rounding control bits offset by 3 and the exception mask
|
||||
* bits offset by 7.
|
||||
*/
|
||||
#define _SSE_ROUND_SHIFT 3
|
||||
#define _SSE_EMASK_SHIFT 7
|
||||
|
||||
__BEGIN_DECLS
|
||||
|
||||
/* Default floating-point environment */
|
||||
extern const fenv_t __fe_dfl_env;
|
||||
#define FE_DFL_ENV (&__fe_dfl_env)
|
||||
|
||||
#define __fldcw(__cw) __asm __volatile("fldcw %0" : : "m" (__cw))
|
||||
#define __fldenv(__env) __asm __volatile("fldenv %0" : : "m" (__env))
|
||||
#define __fnclex() __asm __volatile("fnclex")
|
||||
#define __fnstenv(__env) __asm("fnstenv %0" : "=m" (*(__env)))
|
||||
#define __fnstcw(__cw) __asm("fnstcw %0" : "=m" (*(__cw)))
|
||||
#define __fnstsw(__sw) __asm("fnstsw %0" : "=am" (*(__sw)))
|
||||
#define __fwait() __asm __volatile("fwait")
|
||||
#define __ldmxcsr(__csr) __asm __volatile("ldmxcsr %0" : : "m" (__csr))
|
||||
#define __stmxcsr(__csr) __asm("stmxcsr %0" : "=m" (*(__csr)))
|
||||
|
||||
static __inline int
|
||||
feclearexcept(int __excepts)
|
||||
{
|
||||
fenv_t __env;
|
||||
|
||||
if (__excepts == FE_ALL_EXCEPT) {
|
||||
__fnclex();
|
||||
} else {
|
||||
__fnstenv(&__env.__x87);
|
||||
__env.__x87.__status &= ~__excepts;
|
||||
__fldenv(__env.__x87);
|
||||
}
|
||||
__stmxcsr(&__env.__mxcsr);
|
||||
__env.__mxcsr &= ~__excepts;
|
||||
__ldmxcsr(__env.__mxcsr);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static __inline int
|
||||
fegetexceptflag(fexcept_t *__flagp, int __excepts)
|
||||
{
|
||||
int __mxcsr, __status;
|
||||
|
||||
__stmxcsr(&__mxcsr);
|
||||
__fnstsw(&__status);
|
||||
*__flagp = (__mxcsr | __status) & __excepts;
|
||||
return (0);
|
||||
}
|
||||
|
||||
int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
|
||||
int feraiseexcept(int __excepts);
|
||||
|
||||
static __inline int
|
||||
fetestexcept(int __excepts)
|
||||
{
|
||||
int __mxcsr, __status;
|
||||
|
||||
__stmxcsr(&__mxcsr);
|
||||
__fnstsw(&__status);
|
||||
return ((__status | __mxcsr) & __excepts);
|
||||
}
|
||||
|
||||
static __inline int
|
||||
fegetround(void)
|
||||
{
|
||||
int __control;
|
||||
|
||||
/*
|
||||
* We assume that the x87 and the SSE unit agree on the
|
||||
* rounding mode. Reading the control word on the x87 turns
|
||||
* out to be about 5 times faster than reading it on the SSE
|
||||
* unit on an Opteron 244.
|
||||
*/
|
||||
__fnstcw(&__control);
|
||||
return (__control & _ROUND_MASK);
|
||||
}
|
||||
|
||||
static __inline int
|
||||
fesetround(int __round)
|
||||
{
|
||||
int __mxcsr, __control;
|
||||
|
||||
if (__round & ~_ROUND_MASK)
|
||||
return (-1);
|
||||
|
||||
__fnstcw(&__control);
|
||||
__control &= ~_ROUND_MASK;
|
||||
__control |= __round;
|
||||
__fldcw(__control);
|
||||
|
||||
__stmxcsr(&__mxcsr);
|
||||
__mxcsr &= ~(_ROUND_MASK << _SSE_ROUND_SHIFT);
|
||||
__mxcsr |= __round << _SSE_ROUND_SHIFT;
|
||||
__ldmxcsr(__mxcsr);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
int fegetenv(fenv_t *__envp);
|
||||
int feholdexcept(fenv_t *__envp);
|
||||
|
||||
static __inline int
|
||||
fesetenv(const fenv_t *__envp)
|
||||
{
|
||||
|
||||
__fldenv(__envp->__x87);
|
||||
__ldmxcsr(__envp->__mxcsr);
|
||||
return (0);
|
||||
}
|
||||
|
||||
int feupdateenv(const fenv_t *__envp);
|
||||
|
||||
#if __BSD_VISIBLE
|
||||
|
||||
int fesetmask(int __mask);
|
||||
|
||||
static __inline int
|
||||
fegetmask(void)
|
||||
{
|
||||
int __control;
|
||||
|
||||
/*
|
||||
* We assume that the masks for the x87 and the SSE unit are
|
||||
* the same.
|
||||
*/
|
||||
__fnstcw(&__control);
|
||||
return (~__control & FE_ALL_EXCEPT);
|
||||
}
|
||||
|
||||
#endif /* __BSD_VISIBLE */
|
||||
|
||||
__END_DECLS
|
||||
|
||||
#endif /* !_FENV_H_ */
|
||||
Loading…
Reference in New Issue
Block a user