x87 load/store messed up with unmatched load store

[fuhsnn]

#include <stdio.h>
int main(void) {
    long double m,n,o,p;
    m = n = o = p = 3.0L;
    printf("%Lf,%Lf,%Lf\n", m, n, o); // expected 3.0, 3.0, 3.0

    m = 7.0L + p,p,p,p,p,p,p,p,p;
    printf("%Lf\n", m); // expected 10.0
}