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137 lines
2.7 KiB
137 lines
2.7 KiB
#ifndef _LDHACK_H
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#define _LDHACK_H
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#include <float.h>
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#include <stdint.h>
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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union ldshape {
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long double value;
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struct {
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uint64_t m;
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uint16_t exp:15;
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uint16_t sign:1;
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uint16_t pad;
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} bits;
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};
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#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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union ldshape {
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long double value;
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struct {
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uint64_t mlo;
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uint64_t mhi:48;
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uint16_t exp:15;
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uint16_t sign:1;
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} bits;
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};
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#else
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#error Unsupported long double representation
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#endif
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// FIXME: hacks to make freebsd+openbsd long double code happy
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// union and macros for freebsd
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#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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union IEEEl2bits {
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long double e;
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struct {
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uint32_t manl:32;
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uint32_t manh:32;
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uint32_t exp:15;
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uint32_t sign:1;
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uint32_t pad:16;
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} bits;
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struct {
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uint64_t man:64;
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uint32_t expsign:16;
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uint32_t pad:16;
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} xbits;
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};
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#define LDBL_MANL_SIZE 32
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#define LDBL_MANH_SIZE 32
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#define LDBL_NBIT (1ull << LDBL_MANH_SIZE-1)
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#undef LDBL_IMPLICIT_NBIT
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#define mask_nbit_l(u) ((u).bits.manh &= ~LDBL_NBIT)
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#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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/*
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// ld128 float.h
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//#define LDBL_MAX 1.189731495357231765085759326628007016E+4932L
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#define LDBL_MAX 0x1.ffffffffffffffffffffffffffffp+16383
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#define LDBL_MAX_EXP 16384
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#define LDBL_HAS_INFINITY 1
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//#define LDBL_MIN 3.362103143112093506262677817321752603E-4932L
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#define LDBL_MIN 0x1p-16382
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#define LDBL_HAS_QUIET_NAN 1
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#define LDBL_HAS_DENORM 1
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//#define LDBL_EPSILON 1.925929944387235853055977942584927319E-34L
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#define LDBL_EPSILON 0x1p-112
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#define LDBL_MANT_DIG 113
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#define LDBL_MIN_EXP (-16381)
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#define LDBL_MAX_10_EXP 4932
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#define LDBL_DENORM_MIN 0x0.0000000000000000000000000001p-16381
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#define LDBL_MIN_10_EXP (-4931)
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#define LDBL_DIG 33
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*/
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union IEEEl2bits {
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long double e;
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struct {
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uint64_t manl:64;
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uint64_t manh:48;
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uint32_t exp:15;
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uint32_t sign:1;
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} bits;
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struct {
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uint64_t unused0:64;
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uint64_t unused1:48;
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uint32_t expsign:16;
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} xbits;
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};
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#define LDBL_MANL_SIZE 64
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#define LDBL_MANH_SIZE 48
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#define LDBL_NBIT (1ull << LDBL_MANH_SIZE)
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#define LDBL_IMPLICIT_NBIT 1
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#define mask_nbit_l(u)
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#endif
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// macros for openbsd
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#define GET_LDOUBLE_WORDS(se,mh,ml, f) do{ \
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union IEEEl2bits u; \
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u.e = (f); \
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(se) = u.xbits.expsign; \
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(mh) = u.bits.manh; \
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(ml) = u.bits.manl; \
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}while(0)
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#define SET_LDOUBLE_WORDS(f, se,mh,ml) do{ \
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union IEEEl2bits u; \
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u.xbits.expsign = (se); \
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u.bits.manh = (mh); \
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u.bits.manl = (ml); \
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(f) = u.e; \
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}while(0)
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#define GET_LDOUBLE_EXP(se, f) do{ \
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union IEEEl2bits u; \
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u.e = (f); \
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(se) = u.xbits.expsign; \
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}while(0)
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#define SET_LDOUBLE_EXP(f, se) do{ \
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union IEEEl2bits u; \
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u.e = (f); \
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u.xbits.expsign = (se); \
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(f) = u.e; \
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}while(0)
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#endif
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