mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-23 17:15:31 +00:00
Code Activity

check underflows, aig fixes

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-01-14 19:46:27 -08:00
parent 82cacdf569
commit 0d614b8c36
3 changed files with 16 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/util/mpq.h
View file

@ -640,6 +640,8 @@ public:
void set(mpq & a, int n, int d) {
SASSERT(d != 0);
if (d < 0) {
SASSERT(d != INT_MIN);
SASSERT(n != INT_MIN);
n = -n;
d = -d;
}

26
src/util/mpz.cpp
View file

@ -97,36 +97,10 @@ unsigned u_gcd(unsigned u, unsigned v) {
if (u == v) return u << shift;
do {
v >>= _trailing_zeros32(v);
#if 1
unsigned diff = u - v;
unsigned mdiff = diff & (unsigned)((int)diff >> 31);
u = v + mdiff; // min
v = diff - 2 * mdiff; // if v <= u: u - v, if v > u: v - u = u - v - 2 * (u - v)
#endif
#if 0
unsigned t = _bit_max(u, v);
u = _bit_min(u, v);
v = t;
v -= u;
#endif
#if 0
unsigned t = std::max(u, v);
u = std::min(u,v);
v = t;
v -= u;
#endif
#if 0
if (u > v) std::swap(u, v);
v -= u;
#endif
#if 0
unsigned d1 = u - v;
unsigned d2 = v - u;
unsigned md21 = d2 & (unsigned)((int)d1 >> 31);
unsigned md12 = d1 & (unsigned)((int)d2 >> 31);
u = _bit_min(u, v);
v = md12 | md21;
#endif
}
while (v != 0);
return u << shift;