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test: add comptime memoization tests for bit-for-bit float equality

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kcbanner 2025-03-04 23:28:49 -05:00
parent 8eefc4c5c2
commit 144d69b571
1 changed files with 30 additions and 0 deletions
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30
test/behavior/floatop.zig
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@ -1802,3 +1802,33 @@ test "optimized float mode" {
try expect(S.optimized(small) == small);
try expect(S.strict(small) == tiny);
}
fn MakeType(comptime x: anytype) type {
return struct {
fn get() @TypeOf(x) {
return x;
}
};
}
const nan_a: f32 = @bitCast(@as(u32, 0xffc00000));
const nan_b: f32 = @bitCast(@as(u32, 0xffe00000));
fn testMemoization() !void {
try expect(MakeType(nan_a) == MakeType(nan_a));
try expect(MakeType(nan_b) == MakeType(nan_b));
try expect(MakeType(nan_a) != MakeType(nan_b));
}
fn testVectorMemoization(comptime T: type) !void {
const nan_a_v: T = @splat(nan_a);
const nan_b_v: T = @splat(nan_b);
try expect(MakeType(nan_a_v) == MakeType(nan_a_v));
try expect(MakeType(nan_b_v) == MakeType(nan_b_v));
try expect(MakeType(nan_a_v) != MakeType(nan_b_v));
}
test "comptime calls are only memoized when float arguments are bit-for-bit equal" {
try comptime testMemoization();
try comptime testVectorMemoization(@Vector(4, f32));
}