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ec95e00e28
stage2: change logic for detecting whether the main package is inside
the std package. Previously it relied on realpath() which is not portable.
This uses resolve() which is how imports already work.
* stage2: fix cleanup bug when creating Module
* flatten lib/std/special/* to lib/*
- this was motivated by making main_pkg_is_inside_std false for
compiler_rt & friends.
* rename "mini libc" to "universal libc"
79 lines
2.1 KiB
Zig
79 lines
2.1 KiB
Zig
const addv = @import("addo.zig");
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const testing = @import("std").testing;
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fn test__addosi4(a: i32, b: i32) !void {
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var result_ov: c_int = undefined;
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var expected_ov: c_int = undefined;
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var result = addv.__addosi4(a, b, &result_ov);
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var expected: i32 = simple_addosi4(a, b, &expected_ov);
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try testing.expectEqual(expected, result);
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try testing.expectEqual(expected_ov, result_ov);
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}
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fn simple_addosi4(a: i32, b: i32, overflow: *c_int) i32 {
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overflow.* = 0;
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const min: i32 = -2147483648;
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const max: i32 = 2147483647;
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if (((a > 0) and (b > max - a)) or
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((a < 0) and (b < min - a)))
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overflow.* = 1;
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return a +% b;
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}
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test "addosi4" {
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// -2^31 <= i32 <= 2^31-1
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// 2^31 = 2147483648
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// 2^31-1 = 2147483647
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const min: i32 = -2147483648;
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const max: i32 = 2147483647;
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var i: i32 = 1;
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while (i < max) : (i *|= 2) {
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try test__addosi4(i, i);
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try test__addosi4(-i, -i);
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try test__addosi4(i, -i);
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try test__addosi4(-i, i);
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}
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// edge cases
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// 0 + 0 = 0
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// MIN + MIN overflow
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// MAX + MAX overflow
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// 0 + MIN MIN
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// 0 + MAX MAX
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// MIN + 0 MIN
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// MAX + 0 MAX
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// MIN + MAX -1
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// MAX + MIN -1
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try test__addosi4(0, 0);
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try test__addosi4(min, min);
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try test__addosi4(max, max);
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try test__addosi4(0, min);
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try test__addosi4(0, max);
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try test__addosi4(min, 0);
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try test__addosi4(max, 0);
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try test__addosi4(min, max);
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try test__addosi4(max, min);
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// derived edge cases
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// MIN+1 + MIN overflow
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// MAX-1 + MAX overflow
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// 1 + MIN = MIN+1
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// -1 + MIN overflow
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// -1 + MAX = MAX-1
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// +1 + MAX overflow
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// MIN + 1 = MIN+1
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// MIN + -1 overflow
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// MAX + 1 overflow
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// MAX + -1 = MAX-1
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try test__addosi4(min + 1, min);
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try test__addosi4(max - 1, max);
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try test__addosi4(1, min);
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try test__addosi4(-1, min);
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try test__addosi4(-1, max);
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try test__addosi4(1, max);
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try test__addosi4(min, 1);
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try test__addosi4(min, -1);
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try test__addosi4(max, -1);
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try test__addosi4(max, 1);
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}
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