62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
typedef long Word;
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typedef unsigned long Single;
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typedef struct {
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unsigned long l;
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unsigned long h;
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} Double;
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enum {
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FractBits = 28,
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CarryBit = 0x10000000,
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HiddenBit = 0x08000000,
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MsBit = HiddenBit,
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NGuardBits = 3,
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GuardMask = 0x07,
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LsBit = (1<<NGuardBits),
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SingleExpBias = 127,
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SingleExpMax = 255,
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DoubleExpBias = 1023,
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DoubleExpMax = 2047,
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ExpBias = DoubleExpBias,
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ExpInfinity = DoubleExpMax,
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};
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typedef struct {
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unsigned char s;
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short e;
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long l; /* 0000FFFFFFFFFFFFFFFFFFFFFFFFFGGG */
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long h; /* 0000HFFFFFFFFFFFFFFFFFFFFFFFFFFF */
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} Internal;
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#define IsWeird(n) ((n)->e >= ExpInfinity)
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#define IsInfinity(n) (IsWeird(n) && (n)->h == HiddenBit && (n)->l == 0)
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#define SetInfinity(n) ((n)->e = ExpInfinity, (n)->h = HiddenBit, (n)->l = 0)
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#define IsNaN(n) (IsWeird(n) && (((n)->h & ~HiddenBit) || (n)->l))
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#define SetQNaN(n) ((n)->s = 0, (n)->e = ExpInfinity, \
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(n)->h = HiddenBit|(LsBit<<1), (n)->l = 0)
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#define IsZero(n) ((n)->e == 1 && (n)->h == 0 && (n)->l == 0)
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#define SetZero(n) ((n)->e = 1, (n)->h = 0, (n)->l = 0)
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/*
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* fpi.c
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*/
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extern void fpiround(Internal *);
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extern void fpiadd(Internal *, Internal *, Internal *);
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extern void fpisub(Internal *, Internal *, Internal *);
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extern void fpimul(Internal *, Internal *, Internal *);
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extern void fpidiv(Internal *, Internal *, Internal *);
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extern int fpicmp(Internal *, Internal *);
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extern void fpinormalise(Internal*);
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/*
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* fpimem.c
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*/
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extern void fpis2i(Internal *, void *);
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extern void fpid2i(Internal *, void *);
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extern void fpiw2i(Internal *, void *);
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extern void fpii2s(void *, Internal *);
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extern void fpii2d(void *, Internal *);
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extern void fpii2w(Word *, Internal *);
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