You must write statements which you intend to have executed in sequence. Then you must be careful not to jump into the middle of them.
Statements automatically execute in sequence. There is no support in assembly languagefor enforcing the single entry/single exit idea. You must carefully follow the rule as you program.
You might think that the rule is followed if you only jump to labeled statements. But a statement in the middle of a block might have a label, as in the following:
start: ori $8,$0,4 # $8 = 4
ori $9,$0,12 # $9 = 12
midblk: addu $10,$8,$9 # $10 = 12+4 = 16
sll $10,$10,2 # $10 = 16*4 = 64
....
ori $8,$0,99 # $8 = 99
ori $9,$0,43 # $9 = 43
j midblk # jump to the second statement after start
Is there a syntax for defining code blocks in high-level languages like Pascal, C, or Java?