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frontend: another packedStructFieldPtrInfo fix

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it was calculating host integer size in a wrong way. just use integer
abi size
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Andrew Kelley 2025-09-10 14:56:04 -07:00 • committed by Alex Rønne Petersen
parent b4394412bb
commit 3ab845e028
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2 changed files with 4 additions and 11 deletions
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5
src/Type.zig
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@ -3545,10 +3545,7 @@ pub fn packedStructFieldPtrInfo(struct_ty: Type, parent_ptr_ty: Type, field_idx:
parent_ptr_info.packed_offset.host_size,
parent_ptr_info.packed_offset.bit_offset + bit_offset,
} else .{
switch (zcu.comp.getZigBackend()) {
else => (running_bits + 7) / 8,
.stage2_x86_64 => @intCast(struct_ty.abiSize(zcu)),
},
@intCast(struct_ty.abiSize(zcu)),
bit_offset,
};

10
test/behavior/union.zig
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@ -1564,13 +1564,9 @@ test "packed union field pointer has correct alignment" {
const bp = &b.u.x;
const cp = &c.u.x;
const host_size = switch (builtin.zig_backend) {
else => comptime std.math.divCeil(comptime_int, @bitSizeOf(S), 8) catch unreachable,
.stage2_x86_64 => @sizeOf(S),
};
comptime assert(@TypeOf(ap) == *align(4:2:host_size) u20);
comptime assert(@TypeOf(bp) == *align(1:2:host_size) u20);
comptime assert(@TypeOf(cp) == *align(64:2:host_size) u20);
comptime assert(@TypeOf(ap) == *align(4:2:@sizeOf(S)) u20);
comptime assert(@TypeOf(bp) == *align(1:2:@sizeOf(S)) u20);
comptime assert(@TypeOf(cp) == *align(64:2:@sizeOf(S)) u20);
a.u = .{ .x = 123 };
b.u = .{ .x = 456 };