GoTo, GoSub and related instructions
There are a number of instructions for making program flow break off and jump to another part of your program. Nearly all of them are conditional, meaning you can test some condition and jump one way or another depending on the outcome.
There is also a rich set of conditional subroutine call (GoSub) and Return instructions. A GoSub instruction differs from a GoTo in that it saves away the address that it comes from, so it is possible to later do a Return and get back again. Subroutines can be nested to a depth that depends on the language dialect, meaning there is a limit to how far you can go having one subroutine call another, because there is a limit to how much memory is dedicated to remembering return addresses.
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In This Section Branch BranchJ [D>=16] BranchM mm+ BranchR DecMGoIfNZ mm*+,LLLL DecMRetIfNZ mm+ DecMRetIfZ mm+ fGoIfNeg LLLL fGoIfNZ LLLL fGoIfPos LLLL fGoIfWGEQ LLLL [D>=23] fGoIfWGTQ LLLL [D>=23] fGoIfWLEQ LLLL [D>=23] fGoIfWLTQ LLLL [D>=23] fGoIfZ LLLL GoIfF LLLL GoIfInK ii,LLLL GoIfInOff ii,LLLL GoIfInOn ii,LLLL GoIfINZ LLLL GoIfIZ LLLL GoIfMEQ mm+,nn,LLLL GoIfMGE mm+,nn,LLLL GoIfMGT mm+,nn,LLLL GoIfMLE mm+,nn,LLLL GoIfMLT mm+,nn,LLLL GoIfMNE mm+,nn,LLLL GoIfMNZ mm+,LLLL GoIfMZ mm+,LLLL GoIfNZ LLLL GoIfT LLLL GoIfUF n,m,line GoIfUT n,m,line GoIfXEQ nn,LLLL GoIfXGE nn,LLLL GoIfXGT nn,LLLL GoIfXLE nn,LLLL GoIfXLT nn,LLLL GoIfXNE nn,LLLL GoIfZ LLLL GoSub LLLL GoSubIfF LLLL GoSubIfMNZ mm+,LLLL GoSubIfMZ mm+,LLLL GoSubIfNZ LLLL GoSubIfT LLLL GoSubIfXEQ nn,LLLL GoSubIfXGE nn,LLLL GoSubIfXGT nn,LLLL GoSubIfXLE nn,LLLL GoSubIfXLT nn,LLLL GoSubIfXNE nn,LLLL GoSubIfZ LLLL GoTo LLLL OBCA_GoIfNoRdg line OBCA_GoIfRdg line OBCA_GoSubIfRdg line OBLCD_GoIfBusy line OBLCD_GoIfIdle line RetIfF RetIfMNZ mm+ RetIfMZ mm+ RetIfNZ RetIfT RetIfZ Return GoIfRTCEvent e+,LLLL [D>=16] Suspend mm*+ [D>=12/15] |
