zig/lib/compiler_rt/negXi2.zig

//! neg - negate (the number)
//! - negXi2 for unoptimized little and big endian
//! sfffffff = 2^31-1
//! two's complement inverting bits and add 1 would result in -INT_MIN == 0
//! => -INT_MIN = -2^31 forbidden
//! * size optimized builds
//! * machines that dont support carry operations

const std = @import("std");
const builtin = @import("builtin");
const common = @import("common.zig");

pub const panic = common.panic;

comptime {
    @export(&__negsi2, .{ .name = "__negsi2", .linkage = common.linkage, .visibility = common.visibility });
    @export(&__negdi2, .{ .name = "__negdi2", .linkage = common.linkage, .visibility = common.visibility });
    @export(&__negti2, .{ .name = "__negti2", .linkage = common.linkage, .visibility = common.visibility });
}

pub fn __negsi2(a: i32) callconv(.C) i32 {
    return negXi2(i32, a);
}

pub fn __negdi2(a: i64) callconv(.C) i64 {
    return negXi2(i64, a);
}

pub fn __negti2(a: i128) callconv(.C) i128 {
    return negXi2(i128, a);
}

inline fn negXi2(comptime T: type, a: T) T {
    return -a;
}

test {
    _ = @import("negsi2_test.zig");
    _ = @import("negdi2_test.zig");
    _ = @import("negti2_test.zig");
}