2 * Copyright (c) 1990 Andrew Moore, Talke Studio
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15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93
38 * IEEE floating point type and constant definitions.
41 #ifndef _MACHINE_IEEEFP_H_
42 #define _MACHINE_IEEEFP_H_
45 #error this file needs sys/cdefs.h as a prerequisite
52 FP_RN=0, /* round to nearest */
53 FP_RM, /* round down to minus infinity */
54 FP_RP, /* round up to plus infinity */
62 FP_PS=0, /* 24 bit (single-precision) */
63 FP_PRS, /* reserved */
64 FP_PD, /* 53 bit (double-precision) */
65 FP_PE /* 64 bit (extended-precision) */
68 #define fp_except_t int
73 #define FP_X_INV 0x01 /* invalid operation */
74 #define FP_X_DNML 0x02 /* denormal */
75 #define FP_X_DZ 0x04 /* zero divide */
76 #define FP_X_OFL 0x08 /* overflow */
77 #define FP_X_UFL 0x10 /* underflow */
78 #define FP_X_IMP 0x20 /* (im)precision */
79 #define FP_X_STK 0x40 /* stack fault */
84 #define FP_MSKS_REG 0 /* exception masks */
85 #define FP_PRC_REG 0 /* precision */
86 #define FP_RND_REG 0 /* direction */
87 #define FP_STKY_REG 1 /* sticky flags */
90 * FP register bit field masks
92 #define FP_MSKS_FLD 0x3f /* exception masks field */
93 #define FP_PRC_FLD 0x300 /* precision control field */
94 #define FP_RND_FLD 0xc00 /* round control field */
95 #define FP_STKY_FLD 0x3f /* sticky flags field */
98 * FP register bit field offsets
100 #define FP_MSKS_OFF 0 /* exception masks offset */
101 #define FP_PRC_OFF 8 /* precision control offset */
102 #define FP_RND_OFF 10 /* round control offset */
103 #define FP_STKY_OFF 0 /* sticky flags offset */
105 #ifdef __GNUCLIKE_ASM
107 #define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr)))
108 #define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr)))
109 #define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr)))
110 #define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr)))
113 * return the contents of a FP register
115 static __inline__ int
121 * This is more efficient than it looks. The switch gets optimized
122 * away if _reg is constant.
124 * The default case only supports _reg == 0. We could handle more
125 * registers (e.g., tags) using fnstenv, but the interface doesn't
140 * set a FP mode; return previous mode
142 static __inline__ int
143 __fpsetreg(int _m, int _reg, int _fld, int _off)
149 * _reg == 0 could be handled better using fnstcw/fldcw.
152 _p = (_env[_reg] & _fld) >> _off;
153 _env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld);
158 #endif /* __GNUCLIKE_ASM */
161 * SysV/386 FP control interface
163 #define fpgetround() ((fp_rnd_t) \
164 ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF))
165 #define fpsetround(m) ((fp_rnd_t) \
166 __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF))
167 #define fpgetprec() ((fp_prec_t) \
168 ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF))
169 #define fpsetprec(m) ((fp_prec_t) \
170 __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF))
171 #define fpgetmask() ((fp_except_t) \
172 ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF))
173 #define fpsetmask(m) ((fp_except_t) \
174 (~__fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF)) & \
175 (FP_MSKS_FLD >> FP_MSKS_OFF))
176 #define fpgetsticky() ((fp_except_t) \
177 ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF))
178 #define fpresetsticky(m) ((fp_except_t) \
179 __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF))
181 /* Suppress prototypes in the MI header. */
182 #define _IEEEFP_INLINED_ 1
184 #endif /* !_MACHINE_IEEEFP_H_ */