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101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
#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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three 32 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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unsigned int empty0:32;
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int sign_exponent:16;
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unsigned int empty1:16;
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u_int32_t msw;
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u_int32_t lsw;
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} parts;
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} ieee_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_int32_t lsw;
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u_int32_t msw;
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int sign_exponent:16;
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unsigned int empty1:16;
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unsigned int empty0:32;
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} parts;
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} ieee_long_double_shape_type;
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#endif
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/* Get three 32 bit ints from a double. */
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#define GET_LDOUBLE_WORDS(exp,ix0,ix1,d) \
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do { \
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ieee_long_double_shape_type ew_u; \
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ew_u.value = (d); \
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(exp) = ew_u.parts.sign_exponent; \
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(ix0) = ew_u.parts.msw; \
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(ix1) = ew_u.parts.lsw; \
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} while (0)
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/* Set a double from two 32 bit ints. */
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#define SET_LDOUBLE_WORDS(d,exp,ix0,ix1) \
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do { \
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ieee_long_double_shape_type iw_u; \
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iw_u.parts.sign_exponent = (exp); \
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iw_u.parts.msw = (ix0); \
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iw_u.parts.lsw = (ix1); \
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(d) = iw_u.value; \
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} while (0)
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/* Get the more significant 32 bits of a long double mantissa. */
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#define GET_LDOUBLE_MSW(v,d) \
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do { \
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ieee_long_double_shape_type sh_u; \
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sh_u.value = (d); \
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(v) = sh_u.parts.msw; \
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} while (0)
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/* Set the more significant 32 bits of a long double mantissa from an int. */
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#define SET_LDOUBLE_MSW(d,v) \
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do { \
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ieee_long_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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/* Get int from the exponent of a long double. */
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#define GET_LDOUBLE_EXP(exp,d) \
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do { \
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ieee_long_double_shape_type ge_u; \
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ge_u.value = (d); \
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(exp) = ge_u.parts.sign_exponent; \
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} while (0)
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/* Set exponent of a long double from an int. */
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#define SET_LDOUBLE_EXP(d,exp) \
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do { \
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ieee_long_double_shape_type se_u; \
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se_u.value = (d); \
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se_u.parts.sign_exponent = (exp); \
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(d) = se_u.value; \
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} while (0)
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