| author |  Cody Tapscott <topolarity@tapscott.me> 2022-04-25 16:32:42-07:00 |
| committer | Cody Tapscott <topolarity@tapscott.me> 2022-04-25 17:21:09-07:00 |
| log | f5540778b56636cffd89f794c6b1a9266d7d36f8 |
| tree | 08ddd7e6b30ea5bda531bc7fc57a3f6236927213 |
| parent | d930e015c75d60e22d0a116a1f4fa0df4d68b6b6 |
stdlib: Fix hex-float printing for f80
2 files changed, 10 insertions(+), 3 deletions(-)
lib- std
lib/std/fmt.zig+4-3
| ... | ... | @@ -1124,6 +1124,7 @@ pub fn formatFloatHexadecimal( |
| 1124 | 1124 | const TU = std.meta.Int(.unsigned, std.meta.bitCount(T)); |
| 1125 | 1125 | |
| 1126 | 1126 | const mantissa_bits = math.floatMantissaBits(T); |
| 1127 | const fractional_bits = math.floatFractionalBits(T); | |
| 1127 | 1128 | const exponent_bits = math.floatExponentBits(T); |
| 1128 | 1129 | const mantissa_mask = (1 << mantissa_bits) - 1; |
| 1129 | 1130 | const exponent_mask = (1 << exponent_bits) - 1; |
| ... | ... | @@ -1155,14 +1156,14 @@ pub fn formatFloatHexadecimal( |
| 1155 | 1156 | // Adjust the exponent for printing. |
| 1156 | 1157 | exponent += 1; |
| 1157 | 1158 | } else { |
| 1158 | // Add the implicit 1. | |
| 1159 | mantissa |= 1 << mantissa_bits; | |
| 1159 | if (fractional_bits == mantissa_bits) | |
| 1160 | mantissa |= 1 << fractional_bits; // Add the implicit integer bit. | |
| 1160 | 1161 | } |
| 1161 | 1162 | |
| 1162 | 1163 | // Fill in zeroes to round the mantissa width to a multiple of 4. |
| 1163 | 1164 | if (T == f16) mantissa <<= 2 else if (T == f32) mantissa <<= 1; |
| 1164 | 1165 | |
| 1165 | const mantissa_digits = (mantissa_bits + 3) / 4; | |
| 1166 | const mantissa_digits = (fractional_bits + 3) / 4; | |
| 1166 | 1167 | |
| 1167 | 1168 | if (options.precision) |precision| { |
| 1168 | 1169 | // Round if needed. |
lib/std/math/signbit.zig+6
| ... | ... | @@ -9,6 +9,7 @@ pub fn signbit(x: anytype) bool { |
| 9 | 9 | f16 => signbit16(x), |
| 10 | 10 | f32 => signbit32(x), |
| 11 | 11 | f64 => signbit64(x), |
| 12 | f80 => signbit80(x), | |
| 12 | 13 | f128 => signbit128(x), |
| 13 | 14 | else => @compileError("signbit not implemented for " ++ @typeName(T)), |
| 14 | 15 | }; |
| ... | ... | @@ -29,6 +30,11 @@ fn signbit64(x: f64) bool { |
| 29 | 30 | return bits >> 63 != 0; |
| 30 | 31 | } |
| 31 | 32 | |
| 33 | fn signbit80(x: f80) bool { | |
| 34 | const bits = @bitCast(u80, x); | |
| 35 | return bits >> 79 != 0; | |
| 36 | } | |
| 37 | ||
| 32 | 38 | fn signbit128(x: f128) bool { |
| 33 | 39 | const bits = @bitCast(u128, x); |
| 34 | 40 | return bits >> 127 != 0; |