826549e53d
compilations which use fenv.h work. Reviewed by: tjil Sponsored by: The FreeBSD Foundation
356 lines
8.6 KiB
C
356 lines
8.6 KiB
C
/*-
|
|
* Copyright (c) 2004-2005 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>
|
|
|
|
#ifndef __fenv_static
|
|
#define __fenv_static static
|
|
#endif
|
|
|
|
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
|
|
|
|
#ifdef __i386__
|
|
/*
|
|
* To preserve binary compatibility with FreeBSD 5.3, we pack the
|
|
* mxcsr into some reserved fields, rather than changing sizeof(fenv_t).
|
|
*/
|
|
typedef struct {
|
|
__uint16_t __control;
|
|
__uint16_t __mxcsr_hi;
|
|
__uint16_t __status;
|
|
__uint16_t __mxcsr_lo;
|
|
__uint32_t __tag;
|
|
char __other[16];
|
|
} fenv_t;
|
|
#else /* __amd64__ */
|
|
typedef struct {
|
|
struct {
|
|
__uint32_t __control;
|
|
__uint32_t __status;
|
|
__uint32_t __tag;
|
|
char __other[16];
|
|
} __x87;
|
|
__uint32_t __mxcsr;
|
|
} fenv_t;
|
|
#endif /* __i386__ */
|
|
|
|
__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 __fldenvx(__env) __asm __volatile("fldenv %0" : : "m" (__env) \
|
|
: "st", "st(1)", "st(2)", "st(3)", "st(4)", \
|
|
"st(5)", "st(6)", "st(7)")
|
|
#define __fnclex() __asm __volatile("fnclex")
|
|
#define __fnstenv(__env) __asm __volatile("fnstenv %0" : "=m" (*(__env)))
|
|
#define __fnstcw(__cw) __asm __volatile("fnstcw %0" : "=m" (*(__cw)))
|
|
#define __fnstsw(__sw) __asm __volatile("fnstsw %0" : "=am" (*(__sw)))
|
|
#define __fwait() __asm __volatile("fwait")
|
|
#define __ldmxcsr(__csr) __asm __volatile("ldmxcsr %0" : : "m" (__csr))
|
|
#define __stmxcsr(__csr) __asm __volatile("stmxcsr %0" : "=m" (*(__csr)))
|
|
|
|
int fegetenv(fenv_t *__envp);
|
|
int feholdexcept(fenv_t *__envp);
|
|
int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
|
|
int feraiseexcept(int __excepts);
|
|
int feupdateenv(const fenv_t *__envp);
|
|
|
|
__fenv_static inline int
|
|
fegetround(void)
|
|
{
|
|
__uint16_t __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);
|
|
}
|
|
|
|
#if __BSD_VISIBLE
|
|
|
|
int feenableexcept(int __mask);
|
|
int fedisableexcept(int __mask);
|
|
|
|
/* We currently provide no external definition of fegetexcept(). */
|
|
static inline int
|
|
fegetexcept(void)
|
|
{
|
|
__uint16_t __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 */
|
|
|
|
#ifdef __i386__
|
|
|
|
/* After testing for SSE support once, we cache the result in __has_sse. */
|
|
enum __sse_support { __SSE_YES, __SSE_NO, __SSE_UNK };
|
|
extern enum __sse_support __has_sse;
|
|
int __test_sse(void);
|
|
#ifdef __SSE__
|
|
#define __HAS_SSE() 1
|
|
#else
|
|
#define __HAS_SSE() (__has_sse == __SSE_YES || \
|
|
(__has_sse == __SSE_UNK && __test_sse()))
|
|
#endif
|
|
|
|
#define __get_mxcsr(env) (((env).__mxcsr_hi << 16) | \
|
|
((env).__mxcsr_lo))
|
|
#define __set_mxcsr(env, x) do { \
|
|
(env).__mxcsr_hi = (__uint32_t)(x) >> 16; \
|
|
(env).__mxcsr_lo = (__uint16_t)(x); \
|
|
} while (0)
|
|
|
|
__fenv_static inline int
|
|
feclearexcept(int __excepts)
|
|
{
|
|
fenv_t __env;
|
|
__uint32_t __mxcsr;
|
|
|
|
if (__excepts == FE_ALL_EXCEPT) {
|
|
__fnclex();
|
|
} else {
|
|
__fnstenv(&__env);
|
|
__env.__status &= ~__excepts;
|
|
__fldenv(__env);
|
|
}
|
|
if (__HAS_SSE()) {
|
|
__stmxcsr(&__mxcsr);
|
|
__mxcsr &= ~__excepts;
|
|
__ldmxcsr(__mxcsr);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fegetexceptflag(fexcept_t *__flagp, int __excepts)
|
|
{
|
|
__uint32_t __mxcsr;
|
|
__uint16_t __status;
|
|
|
|
__fnstsw(&__status);
|
|
if (__HAS_SSE())
|
|
__stmxcsr(&__mxcsr);
|
|
else
|
|
__mxcsr = 0;
|
|
*__flagp = (__mxcsr | __status) & __excepts;
|
|
return (0);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fetestexcept(int __excepts)
|
|
{
|
|
__uint32_t __mxcsr;
|
|
__uint16_t __status;
|
|
|
|
__fnstsw(&__status);
|
|
if (__HAS_SSE())
|
|
__stmxcsr(&__mxcsr);
|
|
else
|
|
__mxcsr = 0;
|
|
return ((__status | __mxcsr) & __excepts);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fesetround(int __round)
|
|
{
|
|
__uint32_t __mxcsr;
|
|
__uint16_t __control;
|
|
|
|
if (__round & ~_ROUND_MASK)
|
|
return (-1);
|
|
|
|
__fnstcw(&__control);
|
|
__control &= ~_ROUND_MASK;
|
|
__control |= __round;
|
|
__fldcw(__control);
|
|
|
|
if (__HAS_SSE()) {
|
|
__stmxcsr(&__mxcsr);
|
|
__mxcsr &= ~(_ROUND_MASK << _SSE_ROUND_SHIFT);
|
|
__mxcsr |= __round << _SSE_ROUND_SHIFT;
|
|
__ldmxcsr(__mxcsr);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fesetenv(const fenv_t *__envp)
|
|
{
|
|
fenv_t __env = *__envp;
|
|
__uint32_t __mxcsr;
|
|
|
|
__mxcsr = __get_mxcsr(__env);
|
|
__set_mxcsr(__env, 0xffffffff);
|
|
/*
|
|
* XXX Using fldenvx() instead of fldenv() tells the compiler that this
|
|
* instruction clobbers the i387 register stack. This happens because
|
|
* we restore the tag word from the saved environment. Normally, this
|
|
* would happen anyway and we wouldn't care, because the ABI allows
|
|
* function calls to clobber the i387 regs. However, fesetenv() is
|
|
* inlined, so we need to be more careful.
|
|
*/
|
|
__fldenvx(__env);
|
|
if (__HAS_SSE())
|
|
__ldmxcsr(__mxcsr);
|
|
return (0);
|
|
}
|
|
|
|
#else /* __amd64__ */
|
|
|
|
__fenv_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);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fegetexceptflag(fexcept_t *__flagp, int __excepts)
|
|
{
|
|
__uint32_t __mxcsr;
|
|
__uint16_t __status;
|
|
|
|
__stmxcsr(&__mxcsr);
|
|
__fnstsw(&__status);
|
|
*__flagp = (__mxcsr | __status) & __excepts;
|
|
return (0);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fetestexcept(int __excepts)
|
|
{
|
|
__uint32_t __mxcsr;
|
|
__uint16_t __status;
|
|
|
|
__stmxcsr(&__mxcsr);
|
|
__fnstsw(&__status);
|
|
return ((__status | __mxcsr) & __excepts);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fesetround(int __round)
|
|
{
|
|
__uint32_t __mxcsr;
|
|
__uint16_t __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);
|
|
}
|
|
|
|
__fenv_static inline int
|
|
fesetenv(const fenv_t *__envp)
|
|
{
|
|
|
|
/*
|
|
* XXX Using fldenvx() instead of fldenv() tells the compiler that this
|
|
* instruction clobbers the i387 register stack. This happens because
|
|
* we restore the tag word from the saved environment. Normally, this
|
|
* would happen anyway and we wouldn't care, because the ABI allows
|
|
* function calls to clobber the i387 regs. However, fesetenv() is
|
|
* inlined, so we need to be more careful.
|
|
*/
|
|
__fldenvx(__envp->__x87);
|
|
__ldmxcsr(__envp->__mxcsr);
|
|
return (0);
|
|
}
|
|
|
|
#endif /* __i386__ */
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* !_FENV_H_ */
|