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reduce comparisons in hex_str_to_bin

This commit is contained in:
Trevor Spiteri 2019-08-10 20:34:29 +02:00
parent af02209c48
commit 7d9f738b70
1 changed files with 5 additions and 6 deletions
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11
src/from_str.rs
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@ -74,12 +74,11 @@ where
let mut bits = I::NBITS - dump_bits;
let mut acc = I::ZERO;
for byte in a.as_bytes() {
let val = match byte {
b @ b'0'..=b'9' => b - b'0',
b @ b'A'..=b'F' => b - b'A' + 10,
b @ b'a'..=b'f' => b - b'a' + 10,
_ => 0,
};
// We know that byte is a valid hex:
// * b'0'..=b'9' (0x30..=0x39) => val = byte & 0x0f
// * b'A'..=b'F' (0x41..=0x46) => val = byte & 0x0f + 9
// * b'a'..=b'f' (0x61..=0x66) => val = byte & 0x0f + 9
let val = (byte & 0x0f) + if byte >= 0x40 { 9 } else { 0 };
if bits < 4 {
acc = (acc << bits) + I::from(val >> (4 - bits));
// round