TMLL is better because more compact, assuming that John McKown---We're in a thicket of Johns---wants to use such an instruction.
--jg On 8/27/12, John Ehrman <ehr...@us.ibm.com> wrote: > John McKown wrote: > >>As an example of (1), I quite often do: > >> CALL PROGRAM,(PARM1,PARM2),VL >> CHI R15,=Y(MAXENTRIES) >> JH INVALID_RC >> B *+4(R15) >>START J RC0 >> J RC4 >> J RC8 >>MAXENTRIES EQU *-START/4 > > There's no need for a based branch: just write > > JH INVALID_RC (as before) > LARL 0,START > AR 15,0 > BR 15 > START J RC0 > J RC4 > J RC8 > > You can check that the return code is a multiple of 4 with a TMLL > instruction: > > TMLL 15,B'0011' > JNZ BadRetCode >
