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naughty overflow bug fixed

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This commit is contained in:
Nikolay Volf 2016-02-26 16:50:12 +03:00
parent 023c623650
commit 5013c4d1f1
1 changed files with 20 additions and 6 deletions
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26
util/src/uint.rs
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@ -226,16 +226,30 @@ macro_rules! uint_overflowing_mul {
jne 2f jne 2f
popcnt $8, %rcx popcnt $8, %rcx
popcnt $7, %rax jrcxz 12f
add %rax, %rcx
jrcxz 2f
popcnt $12, %rcx popcnt $12, %rcx
popcnt $11, %rax popcnt $11, %rax
add %rax, %rcx add %rax, %rcx
jrcxz 2f popcnt $10, %rax
add %rax, %rcx
jmp 2f
mov $$1, %rcx 12:
popcnt $12, %rcx
jrcxz 11f
popcnt $7, %rcx
popcnt $6, %rax
add %rax, %rcx
cmpq $$0, %rcx
jne 2f
11:
popcnt $11, %rcx
jrcxz 2f
popcnt $7, %rcx
2: 2:
" "
@ -1569,7 +1583,7 @@ mod tests {
assert!(!overflow); assert!(!overflow);
let (_, overflow) = U256([0, 1, 0, 0]).overflowing_mul(U256([0, 0, 0, ::std::u64::MAX])); let (_, overflow) = U256([0, 1, 0, 0]).overflowing_mul(U256([0, 0, 0, ::std::u64::MAX]));
assert!(!overflow); assert!(overflow);
let (_, overflow) = U256([0, 1, 0, 0]).overflowing_mul(U256([0, 1, 0, 0])); let (_, overflow) = U256([0, 1, 0, 0]).overflowing_mul(U256([0, 1, 0, 0]));
assert!(!overflow); assert!(!overflow);