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83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
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#ifndef _MATH_PRIVATE_H_
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#error "Never use <math_ldbl.h> directly; include <math_private.h> instead."
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#endif
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/* A union which permits us to convert between a long double and
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four 32 bit ints or two 64 bit ints. */
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#if __FLOAT_WORD_ORDER == BIG_ENDIAN
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typedef union
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{
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long double value;
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struct
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{
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u_int64_t msw;
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u_int64_t lsw;
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} parts64;
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struct
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{
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u_int32_t w0, w1, w2, w3;
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} parts32;
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} ieee854_long_double_shape_type;
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#endif
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#if __FLOAT_WORD_ORDER == LITTLE_ENDIAN
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typedef union
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{
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long double value;
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struct
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{
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u_int64_t lsw;
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u_int64_t msw;
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} parts64;
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struct
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{
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u_int32_t w3, w2, w1, w0;
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} parts32;
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} ieee854_long_double_shape_type;
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#endif
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/* Get two 64 bit ints from a long double. */
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#define GET_LDOUBLE_WORDS64(ix0,ix1,d) \
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do { \
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ieee854_long_double_shape_type qw_u; \
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qw_u.value = (d); \
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(ix0) = qw_u.parts64.msw; \
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(ix1) = qw_u.parts64.lsw; \
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} while (0)
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/* Set a long double from two 64 bit ints. */
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#define SET_LDOUBLE_WORDS64(d,ix0,ix1) \
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do { \
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ieee854_long_double_shape_type qw_u; \
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qw_u.parts64.msw = (ix0); \
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qw_u.parts64.lsw = (ix1); \
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(d) = qw_u.value; \
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} while (0)
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/* Get the more significant 64 bits of a long double mantissa. */
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#define GET_LDOUBLE_MSW64(v,d) \
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do { \
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ieee854_long_double_shape_type sh_u; \
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sh_u.value = (d); \
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(v) = sh_u.parts64.msw; \
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} while (0)
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/* Set the more significant 64 bits of a long double mantissa from an int. */
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#define SET_LDOUBLE_MSW64(d,v) \
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do { \
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ieee854_long_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts64.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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