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add behavior test for optimized float math

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Closes #19178
This commit is contained in:
Veikka Tuominen 2024-03-17 22:23:16 +02:00
parent 8ac5eb0893
commit aa03ec8001
1 changed files with 21 additions and 0 deletions
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21
test/behavior/floatop.zig
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@ -1636,3 +1636,24 @@ test "runtime isNan(inf * 0)" {
const zero_times_inf = 0 * std.math.inf(f64);
try std.testing.expect(std.math.isNan(zero_times_inf));
}
test "optimized float mode" {
if (builtin.mode == .Debug) return error.SkipZigTest;
const big = 0x1p40;
const small = 0.001;
const tiny = 0x1p-10;
const S = struct {
fn strict(x: f64) f64 {
@setFloatMode(.strict);
return x + big - big;
}
fn optimized(x: f64) f64 {
@setFloatMode(.optimized);
return x + big - big;
}
};
try expect(S.optimized(small) == small);
try expect(S.strict(small) == tiny);
}