SNG_FRACBITS

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#define SNG_SHIFT (SNG_FRACBITS - FP_LG)

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frac = i & mask(SNG_FRACBITS);

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#define SNG_EXP(e) ((e) << SNG_FRACBITS) /* makes e an exponent */

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(void) __fpu_shr(fp, FP_NMANT - 1 - SNG_FRACBITS);

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(void) __fpu_shr(fp, FP_NMANT - FP_NG - SNG_FRACBITS - exp);

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(void) __fpu_shr(fp, FP_NMANT - FP_NG - 1 - SNG_FRACBITS);