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add behavior test for sub-aligned field access

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The workaround in std.zig.Server remains because the C backend is not
passing the new test.

see #14904
This commit is contained in:
Andrew Kelley 2023-07-31 18:25:27 -07:00
parent e84cda0ebf
commit 4f6013bf50
1 changed files with 22 additions and 0 deletions
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22
test/behavior/align.zig
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@ -593,3 +593,25 @@ test "alignment of slice element" {
const a: []align(1024) const u8 = undefined;
try expect(@TypeOf(&a[0]) == *align(1024) const u8);
}
test "sub-aligned pointer field access" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
// Originally reported at https://github.com/ziglang/zig/issues/14904
const Header = extern struct {
tag: u32,
bytes_len: u32,
};
var buf: [9]u8 align(4) = .{ 1, 2, 3, 4, 5, 6, 7, 8, 9 };
const ptr: *align(1) Header = @ptrCast(buf[1..][0..8]);
const x = ptr.bytes_len;
switch (builtin.cpu.arch.endian()) {
.Big => try expect(x == 0x06070809),
.Little => try expect(x == 0x09080706),
}
}