u-boot/lib_nios/math.h

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#define BITS_PER_UNIT 8
typedef int HItype __attribute__ ((mode (HI)));
typedef unsigned int UHItype __attribute__ ((mode (HI)));
typedef int SItype __attribute__ ((mode (SI)));
typedef unsigned int USItype __attribute__ ((mode (SI)));
typedef int word_type __attribute__ ((mode (__word__)));
struct SIstruct {HItype low, high;};
typedef union {
struct SIstruct s;
SItype ll;
} SIunion;