By Jiri Adamek
Even supposing dedicated to buildings of fine codes for errors keep watch over, secrecy or information compression, the emphasis is at the first path. Introduces a couple of vital periods of error-detecting and error-correcting codes in addition to their deciphering tools. history fabric on smooth algebra is gifted the place required. The position of error-correcting codes in glossy cryptography is taken care of as are facts compression and different subject matters relating to details thought. The definition-theorem evidence type utilized in arithmetic texts is hired throughout the booklet yet formalism is refrained from anywhere attainable.
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After observing the state, you may tell XSPIM to finish executing your program in its entirety (or until it encounters another breakpoint), or you may step through your program line by line. Breakpoints are useful to pass over a loop quickly and avoid single stepping around it many times. __ Single stepping contro l To continue execution of your program from a breakpoint, or at the very start of your program, press the 'step' button. This brings up the step window (Figure 4. 1 1 ), which allows you to either step through your program (press the 'step' button) or continue execution of your program (press the 'continue' button).
38 AN EXAM PLE M I PS PROGRAM Memory P ro c e s s o r $t0 $tl $ t2 [[Il] Oxl O O l O O O O O x1 0 0 1 0 0 0 1 Ox1 0 0 1 0 0 0 2 O x1 0 0 1 0 0 0 3 O x1 0 0 1 0 0 0 4 [[Il] O x1 0 0 1 0 0 0 5 O x1 0 0 1 0 0 0 6 O x1 0 0 1 0 0 0 7 I lw, load word , copies a word from memory i nto a register O x1 0 0 1 0 0 0 8 O x1 0 0 1 0 0 0 9 O x l O O l O O OA O xl O O l O O O B 0 O O l O O OC Oxl l O O OD Oxl O O OOE O xl O O l O F O x1 0 0 1 0 0 1 1 O x1 0 0 1 0 0 1 2 O x1 0 0 1 0 0 1 3 O x1 0 0 1 0 0 1 4 O x1 0 0 1 0 0 1 5 O x1 0 0 1 0 0 1 6 O x1 0 0 1 0 0 1 7 Figure 4.
The mnemonic add $ t 0 , $ t l , $ t 2 means to = tl + t2 Note the order of the operands. The arguments are the contents o f the registers, so this is known as register addressing mode. A programmer who needs one input to be a constant can use: addi $ t 0 , $ t l , 1 5 ARITHMETIC INSTRUCTIONS Proc e s s o r $t0 $ tl $ t2 39 Memo ry ITIJJ m O xl O O l O O O O O x1 0 0 1 0 0 0 1 O x1 0 0 1 0 0 0 2 O x1 0 0 1 0 0 0 3 Ox1 0 0 1 0 0 0 4 [IlJ Ox1 0 0 1 0 0 0 5 O x1 0 0 1 0 0 0 6 O x1 0 0 1 0 0 0 7 I lb, load byte , O x1 0 0 1 0 0 0 8 O x1 0 0 1 0 0 0 9 0 O O l O O OA Oxl O O O OB copies a byte from O x1 0 0 1 0 0 0 memory i nto a reg ister O xl O O l O O O D O xl O O l O O O E O xl O O l O O O F O x1 0 0 1 0 0 1 0 O x1 0 0 1 0 0 1 1 O x1 0 0 1 0 0 1 2 O x1 0 0 1 0 0 1 3 O x1 0 0 1 0 0 1 4 O x1 0 0 1 0 0 1 5 O x1 0 0 1 0 0 1 6 O x1 0 0 1 0 0 1 7 Figure 4.