add behavior test for comptime pointer casting

andrewrk · andrewrk · commit 300b6d2d2abc · 2022-12-18T13:57:17.000-07:00
closes #1150 closes #1292 closes #4093
diff --git a/test/behavior/ptrcast.zig b/test/behavior/ptrcast.zig
@@ -203,6 +203,12 @@ test "comptime ptrcast keeps larger alignment" {
     }
 }
 
+test "comptime ptrcast" {
+    const is_value = ~@intCast(isize, std.math.minInt(isize));
+    const is_bytes = @ptrCast([*]const u8, &is_value)[0..@sizeOf(isize)];
+    try expect(is_bytes[0] == 0xff);
+}
+
 test "implicit optional pointer to optional anyopaque pointer" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO

Original file line number	Diff line number	Diff line change
`@@ -203,6 +203,12 @@ test "comptime ptrcast keeps larger alignment" {`
`203`	`203`	`}`
`204`	`204`	`}`
`205`	`205`
	`206`	`+test "comptime ptrcast" {`
	`207`	`+ const is_value = ~@intCast(isize, std.math.minInt(isize));`
	`208`	`+ const is_bytes = @ptrCast([*]const u8, &is_value)[0..@sizeOf(isize)];`
	`209`	`+ try expect(is_bytes[0] == 0xff);`
	`210`	`+}`
	`211`	`+`
`206`	`212`	`test "implicit optional pointer to optional anyopaque pointer" {`
`207`	`213`	`if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO`
`208`	`214`	`if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO`