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Add memcmp to builtins

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vegecode 2019-03-25 22:13:21 -05:00
parent a4afacd182
commit e89b704293
1 changed files with 25 additions and 0 deletions
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25
std/special/builtin.zig
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@ -55,6 +55,31 @@ export fn memmove(dest: ?[*]u8, src: ?[*]const u8, n: usize) ?[*]u8 {
return dest;
}
export fn memcmp(vl: ?[*]const u8, vr: ?[*]const u8, n: usize) isize {
@setRuntimeSafety(false);
var index: usize = 0;
while (index != n) : (index += 1) {
const compare_val = @bitCast(i8, vl.?[index] -% vr.?[index]);
if (compare_val != 0) {
return compare_val;
}
}
return 0;
}
test "test_memcmp" {
const base_arr = []u8{ 1, 1, 1 };
const arr1 = []u8{ 1, 1, 1 };
const arr2 = []u8{ 1, 0, 1 };
const arr3 = []u8{ 1, 2, 1 };
std.testing.expect(memcmp(base_arr[0..].ptr, arr1[0..].ptr, base_arr.len) == 0);
std.testing.expect(memcmp(base_arr[0..].ptr, arr2[0..].ptr, base_arr.len) == 1);
std.testing.expect(memcmp(base_arr[0..].ptr, arr3[0..].ptr, base_arr.len) == -1);
}
comptime {
if (builtin.mode != builtin.Mode.ReleaseFast and
builtin.mode != builtin.Mode.ReleaseSmall and