diff options
Diffstat (limited to 'sys/amd64/include/floatingpoint.h')
-rw-r--r-- | sys/amd64/include/floatingpoint.h | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/sys/amd64/include/floatingpoint.h b/sys/amd64/include/floatingpoint.h index 56c781a..fd328a9 100644 --- a/sys/amd64/include/floatingpoint.h +++ b/sys/amd64/include/floatingpoint.h @@ -37,94 +37,6 @@ #ifndef _FLOATINGPOINT_H_ #define _FLOATINGPOINT_H_ -/* - * IEEE floating point structure and function definitions - */ - -/*- - * XXX the following undocumented pollution is exported: - * fpsetsticky(). - * FP*FLD, FP*OFF and FP*REG from <machine/ieeefp.h> - */ - -#include <sys/cdefs.h> #include <machine/ieeefp.h> -#ifdef __GNUC__ - -#define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr))) -#define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr))) -#define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr))) -#define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr))) - -/* - * return the contents of a FP register - */ -static __inline__ int -__fpgetreg(int _reg) -{ - unsigned short _mem; - - /*- - * This is more efficient than it looks. The switch gets optimized - * away if _reg is constant. - * - * The default case only supports _reg == 0. We could handle more - * registers (e.g., tags) using fnstenv, but the interface doesn't - * support more. - */ - switch(_reg) { - default: - __fnstcw(&_mem); - break; - case FP_STKY_REG: - __fnstsw(&_mem); - break; - } - return _mem; -} - -/* - * set a FP mode; return previous mode - */ -static __inline__ int -__fpsetreg(int _m, int _reg, int _fld, int _off) -{ - unsigned _env[7]; - unsigned _p; - - /* - * _reg == 0 could be handled better using fnstcw/fldcw. - */ - __fnstenv(_env); - _p = (_env[_reg] & _fld) >> _off; - _env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld); - __fldenv(_env); - return _p; -} - -#endif /* __GNUC__ */ - -/* - * SysV/386 FP control interface - */ -#define fpgetround() ((fp_rnd_t) \ - ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF)) -#define fpsetround(m) ((fp_rnd_t) \ - __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF)) -#define fpgetprec() ((fp_prec_t) \ - ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF)) -#define fpsetprec(m) ((fp_prec_t) \ - __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF)) -#define fpgetmask() ((fp_except_t) \ - ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF)) -#define fpsetmask(m) ((fp_except_t) \ - (~__fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF)) & \ - (FP_MSKS_FLD >> FP_MSKS_OFF)) -#define fpgetsticky() ((fp_except_t) \ - ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF)) -#define fpresetsticky(m) ((fp_except_t) \ - __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF)) -#define fpsetsticky(m) fpresetsticky(m) - #endif /* !_FLOATINGPOINT_H_ */ |