INNER CODE UNIT · C

sum

AmigaPorts/ACE · src/fixmath/fix16.c:13

	uint32_t sum = _a + _b;

	// Overflow can only happen if sign of a == sign of b, and then
	// it causes sign of sum != sign of a.
	if (!((_a ^ _b) & 0x80000000) && ((_a ^ sum) & 0x80000000))
		return fix16_overflow;
	
	return sum;
}

fix16_t fix16_sub(fix16_t a, fix16_t b)
{
	uint32_t _a = a, _b = b;
	uint32_t diff = _a - _b;

	// Overflow can only happen if sign of a != sign of b, and then
	// it causes sign of diff != sign of a.
	if (((_a ^ _b) & 0x80000000) && ((_a ^ diff) & 0x80000000))

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