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std.fmt.parseFloat: fix hex-float negative inf #24119

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Merged
merged 1 commit into from
Jun 8, 2025
Merged

std.fmt.parseFloat: fix hex-float negative inf #24119

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3 changes: 3 additions & 0 deletions lib/std/fmt/parse_float.zig
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Expand Up @@ -159,6 +159,9 @@ test "hex.special" {
try testing.expect(math.isPositiveInf(try parseFloat(f32, "iNf")));
try testing.expect(math.isPositiveInf(try parseFloat(f32, "+Inf")));
try testing.expect(math.isNegativeInf(try parseFloat(f32, "-iNf")));

try testing.expect(math.isPositiveInf(try parseFloat(f32, "0x9999p9999")));
try testing.expect(math.isNegativeInf(try parseFloat(f32, "-0x9999p9999")));
}

test "hex.zero" {
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2 changes: 1 addition & 1 deletion lib/std/fmt/parse_float/convert_hex.zig
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Expand Up @@ -78,7 +78,7 @@ pub fn convertHex(comptime T: type, n_: Number(T)) T {

// Infinity and range error
if (n.exponent > max_exp) {
return math.inf(T);
return if (n.negative) -math.inf(T) else math.inf(T);
}

var bits = n.mantissa & ((1 << mantissa_bits) - 1);
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