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76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
#pragma once
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#include <common/sys/types.h>
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// ===== 描述long double 的数据比特结构
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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 && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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union ldshape
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{
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long double f;
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struct
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{
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uint64_t m;
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uint16_t se;
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} i;
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};
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#elif __LDBL_MANT_DIG__ == 113 && __LDBL_MAX_EXP__ == 16384 && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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union ldshape
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{
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long double f;
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struct
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{
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uint64_t lo;
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uint32_t mid;
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uint16_t top;
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uint16_t se;
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} i;
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struct
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{
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uint64_t lo;
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uint64_t hi;
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} i2;
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};
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#elif __LDBL_MANT_DIG__ == 113 && __LDBL_MAX_EXP__ == 16384 && __BYTE_ORDER__ == __BIG_ENDIAN
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union ldshape
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{
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long double f;
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struct
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{
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uint16_t se;
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uint16_t top;
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uint32_t mid;
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uint64_t lo;
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} i;
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struct
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{
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uint64_t hi;
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uint64_t lo;
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} i2;
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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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#define FORCE_EVAL(x) \
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do \
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{ \
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if (sizeof(x) == sizeof(float)) \
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{ \
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volatile float __x; \
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__x = (x); \
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(void)__x; \
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} \
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else if (sizeof(x) == sizeof(double)) \
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{ \
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volatile double __x; \
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__x = (x); \
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(void)__x; \
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} \
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else \
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{ \
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volatile long double __x; \
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__x = (x); \
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(void)__x; \
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} \
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} while (0)
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