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fix alignment behavior test case

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As demonstrated by this new test case, stage1's functionality is
incorrect since it does not handle slicing from len..len correctly.

stage2 already has the correct behavior here.
This commit is contained in:
Andrew Kelley 2022-05-26 21:55:51 -07:00
parent 4751356d7f
commit 83a2c41cd5
1 changed files with 9 additions and 13 deletions
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22
test/behavior/align.zig
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@ -18,20 +18,16 @@ test "global variable alignment" {
}
}
test "slicing array of length 1 can assume runtime index is always zero" {
if (builtin.zig_backend != .stage1) return error.SkipZigTest; // TODO
test "slicing array of length 1 can not assume runtime index is always zero" {
if (builtin.zig_backend == .stage1) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
// TODO reevaluate this test case, because notice that you can
// change `runtime_zero` to be `1` and the test still passes for stage1.
// Reconsider also this code:
// var array: [4]u8 = undefined;
// var runtime: usize = 4;
// var ptr = array[runtime..];
// _ = ptr;
var runtime_zero: usize = 0;
const slice = @as(*align(4) [1]u8, &foo)[runtime_zero..];
comptime try expect(@TypeOf(slice) == []align(4) u8);
var runtime_index: usize = 1;
const slice = @as(*align(4) [1]u8, &foo)[runtime_index..];
try expect(@TypeOf(slice) == []u8);
try expect(slice.len == 0);
try expect(@truncate(u2, @ptrToInt(slice.ptr) - 1) == 0);
}
test "default alignment allows unspecified in type syntax" {