Asmc Macro Assembler Reference
.SWITCH
The switch comes in three main variants: a structured switch, as in Pascal, which takes exactly one branch, an unstructured switch, as in C, which functions as a type of goto, and a control table switch with the added possibility of testing for combinations of input values, using boolean style AND/OR conditions, and potentially calling subroutines instead of just a single set of values.
The control table switch is declared with no arguments and each .CASE directive does all the testing.
.switch
.case strchr( esi, '<' )
.case strchr( esi, '>' )
jmp around
...
.endsw
The unstructured switch works as a regular C switch where each .CASE directive is just a label.
.switch eax
.case 0: .repeat : movsb
.case 7: movsb
.case 6: movsb
.case 5: movsb
.case 4: movsb
.case 3: movsb
.case 2: movsb
.case 1: movsb : .untilcxz
.endsw
The structured switch works as a regular Pascal switch where each .CASE directive is a closed branch.
.switch eax
.case 1: printf("Gold medal")
.case 2: printf("Silver medal")
.case 3: printf("Bronze medal")
.default
printf("Better luck next time")
.endsw