794 	int	imid, ilow, ihigh;  in invfind()  local
807 	ilow = 0;  in invfind()
809 	while (ilow <= ihigh) {  in invfind()
810 		imid = (ilow + ihigh) / 2;  in invfind()
816 			ilow = ++imid;  in invfind()
818 			ilow = imid + 1;  in invfind()
823 	imid = (ilow) ? ilow - 1 : 0;  in invfind()
832 	ilow = 0;  in invfind()
836 	while (ilow <= ihigh) {  in invfind()
837 		imid = (ilow + ihigh) / 2;  in invfind()
846 			ilow = ++imid;  in invfind()