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Use when integer values are updated using floating-point multiplication (e.g., y = y * 1.01) inside a loop condition that KLEE must symbolically reason about
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| name | avoid-float-arithmetic-in-integer-loops |
| description | Use when integer values are updated using floating-point multiplication (e.g., y = y * 1.01) inside a loop condition that KLEE must symbolically reason about |
A KLEE-coverage code transformation. Applying it rewrites C source so symbolic execution explores more of the program's behavior.
When integer values are updated using floating-point multiplication (e.g., y = y * 1.01) inside a loop condition that KLEE must symbolically reason about
Replace the floating-point scaling with equivalent integer arithmetic (e.g., n = n + n/100), keeping all variables and operations in integer domain
KLEE's constraint solver (STP/Z3) handles bitvector/integer constraints far more efficiently than floating-point ones; floating-point operations are often concretized or poorly modeled, blocking path exploration and reducing achievable branch coverage
Before:
#include<stdio.h>
int main(){
long long x,y=100;
scanf("%lld",&x);
for(int i=1;;++i){
y=y*1.01;
if(y>=x){
printf("%d\n",i);
break;
}
}
}
After:
#include <stdio.h>
long long n, m, i, j, k;
int main(){
scanf("%lld", &m);
n = 100;
while(n < m){
n = n + n/100;
k++;
}
printf("%lld\n", k);
return 0;
}
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