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test: Add test to ensure signed zeros are properly computed

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Ensure everything's ok at comptime and runtime.
This commit is contained in:
LemonBoy 2021-04-15 18:15:44 +02:00
parent 8e0b2f0e52
commit 2d00f17d15
1 changed files with 17 additions and 0 deletions
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17
test/stage1/behavior/math.zig
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@ -843,3 +843,20 @@ test "compare undefined literal with comptime_int" {
x = true;
expect(x);
}
test "signed zeros are represented properly" {
const S = struct {
fn doTheTest() void {
inline for ([_]type{ f16, f32, f64, f128 }) |T| {
const ST = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
var as_fp_val = -@as(T, 0.0);
var as_uint_val = @bitCast(ST, as_fp_val);
// Ensure the sign bit is set.
expect(as_uint_val >> (@typeInfo(T).Float.bits - 1) == 1);
}
}
};
S.doTheTest();
comptime S.doTheTest();
}