EXT_FRACBITS

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#define EXT_SHIFT (-(EXT_FRACBITS - 3 * 32 - FP_LG)) /* left shift! */

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frac = i & mask(EXT_FRACBITS - 3 * 32);

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#define EXT_EXP(e) ((e) << (EXT_FRACBITS & 31))

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