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std.math.cbrt: fixed -0.0 evaluating to 0.0

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Lucas Culverhouse 2023-09-12 11:39:34 -07:00 committed by GitHub
parent 402468b210
commit 5b7eefce46
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1 changed files with 4 additions and 4 deletions
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lib/std/math/cbrt.zig
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@ -87,9 +87,9 @@ fn cbrt64(x: f64) f64 {
u = @as(u64, @bitCast(x * 0x1.0p54));
hx = @as(u32, @intCast(u >> 32)) & 0x7FFFFFFF;
// cbrt(0) is itself
// cbrt(+-0) = itself
if (hx == 0) {
return 0;
return x;
}
hx = hx / 3 + B2;
} else {
@ -148,7 +148,7 @@ test "math.cbrt64" {
test "math.cbrt.special" {
try expect(cbrt32(0.0) == 0.0);
try expect(cbrt32(-0.0) == -0.0);
try expect(@as(u32, @bitCast(cbrt32(-0.0))) == @as(u32, 0x80000000));
try expect(math.isPositiveInf(cbrt32(math.inf(f32))));
try expect(math.isNegativeInf(cbrt32(-math.inf(f32))));
try expect(math.isNan(cbrt32(math.nan(f32))));
@ -156,7 +156,7 @@ test "math.cbrt.special" {
test "math.cbrt64.special" {
try expect(cbrt64(0.0) == 0.0);
try expect(cbrt64(-0.0) == -0.0);
try expect(@as(u64, @bitCast(cbrt64(-0.0))) == @as(u64, 0x8000000000000000));
try expect(math.isPositiveInf(cbrt64(math.inf(f64))));
try expect(math.isNegativeInf(cbrt64(-math.inf(f64))));
try expect(math.isNan(cbrt64(math.nan(f64))));