mul8()

LIB8STATIC_ALWAYS_INLINE uint8_t mul8	(	uint8_t	i,
		uint8_t	j )

8x8 bit multiplication, with 8-bit result.

Parameters

i	first byte to multiply
j	second byte to multiply

Returns

the product of i * j

Note

This does not saturate and may overflow!

Definition at line 446 of file math8.h.

                                                            {
#if MUL8_C == 1
    return ((int)i * (int)(j)) & 0xFF;
#elif MUL8_AVRASM == 1
    asm volatile(
        /* Multiply 8-bit i * 8-bit j, giving 16-bit r1,r0 */
        "mul %0, %1          \n\t"
        /* Extract the LOW 8-bits (r0) */
        "mov %0, r0          \n\t"
        /* Restore r1 to "0"; it's expected to always be that */
        "clr __zero_reg__    \n\t"
        : "+r"(i)
        : "r"(j)
        : "r0", "r1");
    return i;
#else
#error "No implementation for mul8 available."
#endif
}

References LIB8STATIC_ALWAYS_INLINE.