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__divdi3

int.__divdi3

pub fn __divdi3(a: i64, b: i64) callconv(.c) i64

File

lib/compiler_rt/int.zig:112

Code

pub fn __divdi3(a: i64, b: i64) callconv(.c) i64 {
    // Set aside the sign of the quotient.
    const sign: u64 = @bitCast((a ^ b) >> 63);
    // Take absolute value of a and b via abs(x) = (x^(x >> 63)) - (x >> 63).
    const abs_a = (a ^ (a >> 63)) -% (a >> 63);
    const abs_b = (b ^ (b >> 63)) -% (b >> 63);
    // Unsigned division
    const res = __udivmoddi4(@bitCast(abs_a), @bitCast(abs_b), null);
    // Apply sign of quotient to result and return.
    return @bitCast((res ^ sign) -% sign);
}