fmin
double fmin(double, double) __pure2;
n = fmin(ltLo-lo, unLo-ltLo); fvswap(lo, unLo-n, n);
m = fmin(hi-gtHi, gtHi-unHi); fvswap(unLo, hi-m+1, m);
extern double fmin(double, double);
extern double fmin __P((double, double));