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std.fmt.parseHexFloat: clean up bitwise logic

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* fold a couple separate operations into one
 * use const instead of var
 * naming conventions
This commit is contained in:
Andrew Kelley 2022-01-31 20:57:05 -07:00
parent 7f024d6786
commit c46f7588ce
1 changed files with 2 additions and 4 deletions
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6
lib/std/fmt/parse_hex_float.zig
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@ -206,13 +206,11 @@ pub fn parseHexFloat(comptime T: type, s: []const u8) !T {
// - we've truncated more than 0.5ULP (R=S=1)
// - we've truncated exactly 0.5ULP (R=1 S=0)
// Were are going to increase the mantissa (round up)
var exactly_half = (mantissa & 0b11) == 0b10;
var more_than_half = (mantissa & 0b11) == 0b11;
const guard_bit_and_half_or_more = (mantissa & 0b110) == 0b110;
mantissa >>= 2;
var guardBit = mantissa & 1 == 1;
exponent += 2;
if (guardBit and (exactly_half or more_than_half)) {
if (guard_bit_and_half_or_more) {
mantissa += 1;
}