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const builtin = @import("builtin");
const std = @import("std");
const expect = std.testing.expect;
const expectEqual = std.testing.expectEqual;
const maxInt = std.math.maxInt;
test "@intCast i32 to u7" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
var x: u128 = maxInt(u128);
var y: i32 = 120;
_ = .{ &x, &y };
const z = x >> @as(u7, @intCast(y));
try expect(z == 0xff);
}
test "coerce i8 to i32 and @intCast back" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
var x: i8 = -5;
var y: i32 = -5;
_ = .{ &x, &y };
try expect(y == x);
var x2: i32 = -5;
var y2: i8 = -5;
_ = .{ &x2, &y2 };
try expect(y2 == @as(i8, @intCast(x2)));
}
test "coerce non byte-sized integers accross 32bits boundary" {
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
{
var v: u21 = 6417;
_ = &v;
const a: u32 = v;
const b: u64 = v;
const c: u64 = a;
var w: u64 = 0x1234567812345678;
_ = &w;
const d: u21 = @truncate(w);
const e: u60 = d;
try expectEqual(@as(u32, 6417), a);
try expectEqual(@as(u64, 6417), b);
try expectEqual(@as(u64, 6417), c);
try expectEqual(@as(u21, 0x145678), d);
try expectEqual(@as(u60, 0x145678), e);
}
{
var v: u10 = 234;
_ = &v;
const a: u32 = v;
const b: u64 = v;
const c: u64 = a;
var w: u64 = 0x1234567812345678;
_ = &w;
const d: u10 = @truncate(w);
const e: u60 = d;
try expectEqual(@as(u32, 234), a);
try expectEqual(@as(u64, 234), b);
try expectEqual(@as(u64, 234), c);
try expectEqual(@as(u21, 0x278), d);
try expectEqual(@as(u60, 0x278), e);
}
{
var v: u7 = 11;
_ = &v;
const a: u32 = v;
const b: u64 = v;
const c: u64 = a;
var w: u64 = 0x1234567812345678;
_ = &w;
const d: u7 = @truncate(w);
const e: u60 = d;
try expectEqual(@as(u32, 11), a);
try expectEqual(@as(u64, 11), b);
try expectEqual(@as(u64, 11), c);
try expectEqual(@as(u21, 0x78), d);
try expectEqual(@as(u60, 0x78), e);
}
{
var v: i21 = -6417;
_ = &v;
const a: i32 = v;
const b: i64 = v;
const c: i64 = a;
var w: i64 = -12345;
_ = &w;
const d: i21 = @intCast(w);
const e: i60 = d;
try expectEqual(@as(i32, -6417), a);
try expectEqual(@as(i64, -6417), b);
try expectEqual(@as(i64, -6417), c);
try expectEqual(@as(i21, -12345), d);
try expectEqual(@as(i60, -12345), e);
}
{
var v: i10 = -234;
_ = &v;
const a: i32 = v;
const b: i64 = v;
const c: i64 = a;
var w: i64 = -456;
_ = &w;
const d: i10 = @intCast(w);
const e: i60 = d;
try expectEqual(@as(i32, -234), a);
try expectEqual(@as(i64, -234), b);
try expectEqual(@as(i64, -234), c);
try expectEqual(@as(i10, -456), d);
try expectEqual(@as(i60, -456), e);
}
{
var v: i7 = -11;
_ = &v;
const a: i32 = v;
const b: i64 = v;
const c: i64 = a;
var w: i64 = -42;
_ = &w;
const d: i7 = @intCast(w);
const e: i60 = d;
try expectEqual(@as(i32, -11), a);
try expectEqual(@as(i64, -11), b);
try expectEqual(@as(i64, -11), c);
try expectEqual(@as(i7, -42), d);
try expectEqual(@as(i60, -42), e);
}
}
const Piece = packed struct {
color: Color,
type: Type,
const Type = enum(u3) { KING, QUEEN, BISHOP, KNIGHT, ROOK, PAWN };
const Color = enum(u1) { WHITE, BLACK };
fn charToPiece(c: u8) !@This() {
return .{
.type = try charToPieceType(c),
.color = if (std.ascii.isUpper(c)) Color.WHITE else Color.BLACK,
};
}
fn charToPieceType(c: u8) !Type {
return switch (std.ascii.toLower(c)) {
'p' => .PAWN,
'k' => .KING,
'q' => .QUEEN,
'b' => .BISHOP,
'n' => .KNIGHT,
'r' => .ROOK,
else => error.UnexpectedCharError,
};
}
};
// Originally reported at https://github.com/ziglang/zig/issues/14200
test "load non byte-sized optional value" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
// note: this bug is triggered by the == operator, expectEqual will hide it
const opt: ?Piece = try Piece.charToPiece('p');
try expect(opt.?.type == .PAWN);
try expect(opt.?.color == .BLACK);
var p: Piece = undefined;
@as(*u8, @ptrCast(&p)).* = 0b11111011;
try expect(p.type == .PAWN);
try expect(p.color == .BLACK);
}
test "load non byte-sized value in struct" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.cpu.arch.endian() != .little) return error.SkipZigTest; // packed struct TODO
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
// note: this bug is triggered by the == operator, expectEqual will hide it
// using ptrCast not to depend on unitialised memory state
var struct0: struct {
p: Piece,
int: u8,
} = undefined;
@as(*u8, @ptrCast(&struct0.p)).* = 0b11111011;
try expect(struct0.p.type == .PAWN);
try expect(struct0.p.color == .BLACK);
var struct1: packed struct {
p0: Piece,
p1: Piece,
pad: u1,
p2: Piece,
} = undefined;
@as(*u8, @ptrCast(&struct1.p0)).* = 0b11111011;
struct1.p1 = try Piece.charToPiece('p');
struct1.p2 = try Piece.charToPiece('p');
try expect(struct1.p0.type == .PAWN);
try expect(struct1.p0.color == .BLACK);
try expect(struct1.p1.type == .PAWN);
try expect(struct1.p1.color == .BLACK);
try expect(struct1.p2.type == .PAWN);
try expect(struct1.p2.color == .BLACK);
}
test "load non byte-sized value in union" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
// note: this bug is triggered by the == operator, expectEqual will hide it
// using ptrCast not to depend on unitialised memory state
var union0: packed union {
p: packed struct(u8) {
a: Piece,
b: u4,
},
int: u8,
} = .{ .int = 0 };
union0.int = 0b11111011;
try expect(union0.p.a.type == .PAWN);
try expect(union0.p.a.color == .BLACK);
var union1: union {
p: packed struct(u8) {
a: Piece,
b: u4,
},
int: u8,
} = .{ .p = .{ .a = .{ .color = .WHITE, .type = .KING }, .b = 0 } };
@as(*u8, @ptrCast(&union1.p.a)).* = 0b11111011;
try expect(union1.p.a.type == .PAWN);
try expect(union1.p.a.color == .BLACK);
var pieces: [3]Piece = undefined;
@as(*u8, @ptrCast(&pieces[1])).* = 0b11111011;
try expect(pieces[1].type == .PAWN);
try expect(pieces[1].color == .BLACK);
}
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