histptr           229 jquant2.c        register histptr histp;
histptr           319 jquant2.c        histptr histp;
histptr           506 jquant2.c        histptr histp;
histptr           865 jquant2.c        register histptr cachep;	/* pointer into main cache array */
histptr           922 jquant2.c        register histptr cachep;
histptr           961 jquant2.c        histptr cachep;