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Merge pull request #1517 from ethcore/shr-opt

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Optimizing/simplifying shr
This commit is contained in:
Nikolay Volf 2016-07-01 17:58:01 +04:00 committed by GitHub
commit 0a513ad06e
1 changed files with 10 additions and 6 deletions
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14
util/bigint/src/uint.rs
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@ -1031,7 +1031,7 @@ macro_rules! construct_uint {
// shift
for i in word_shift..$n_words {
ret[i] += original[i - word_shift] << bit_shift;
ret[i] = original[i - word_shift] << bit_shift;
}
// carry
if bit_shift > 0 {
@ -1052,14 +1052,18 @@ macro_rules! construct_uint {
let word_shift = shift / 64;
let bit_shift = shift % 64;
// shift
for i in word_shift..$n_words {
// Shift
ret[i - word_shift] += original[i] >> bit_shift;
ret[i - word_shift] = original[i] >> bit_shift;
}
// Carry
if bit_shift > 0 && i < $n_words - 1 {
ret[i - word_shift] += original[i + 1] << (64 - bit_shift);
if bit_shift > 0 {
for i in word_shift+1..$n_words {
ret[i - word_shift - 1] += original[i] << (64 - bit_shift);
}
}
$name(ret)
}
}