84 lines
2.1 KiB
Zig
84 lines
2.1 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const expect = std.testing.expect;
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test "truncate u0 to larger integer allowed and has comptime known result" {
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var x: u0 = 0;
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const y = @truncate(u8, x);
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comptime try expect(y == 0);
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}
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test "truncate.u0.literal" {
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var z = @truncate(u0, 0);
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try expect(z == 0);
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}
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test "truncate.u0.const" {
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const c0: usize = 0;
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var z = @truncate(u0, c0);
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try expect(z == 0);
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}
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test "truncate.u0.var" {
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var d: u8 = 2;
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var z = @truncate(u0, d);
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try expect(z == 0);
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}
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test "truncate i0 to larger integer allowed and has comptime known result" {
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var x: i0 = 0;
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const y = @truncate(i8, x);
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comptime try expect(y == 0);
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}
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test "truncate.i0.literal" {
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var z = @truncate(i0, 0);
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try expect(z == 0);
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}
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test "truncate.i0.const" {
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const c0: isize = 0;
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var z = @truncate(i0, c0);
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try expect(z == 0);
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}
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test "truncate.i0.var" {
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var d: i8 = 2;
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var z = @truncate(i0, d);
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try expect(z == 0);
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}
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test "truncate on comptime integer" {
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var x = @truncate(u16, 9999);
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try expect(x == 9999);
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var y = @truncate(u16, -21555);
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try expect(y == 0xabcd);
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var z = @truncate(i16, -65537);
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try expect(z == -1);
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var w = @truncate(u1, 1 << 100);
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try expect(w == 0);
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}
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test "truncate on vectors" {
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if (builtin.zig_backend == .stage1) {
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// stage1 fails the comptime test
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return error.SkipZigTest;
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}
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if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
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if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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const S = struct {
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fn doTheTest() !void {
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var v1: @Vector(4, u16) = .{ 0xaabb, 0xccdd, 0xeeff, 0x1122 };
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var v2 = @truncate(u8, v1);
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try expect(std.mem.eql(u8, &@as([4]u8, v2), &[4]u8{ 0xbb, 0xdd, 0xff, 0x22 }));
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}
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};
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comptime try S.doTheTest();
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try S.doTheTest();
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}
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