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       .include "macros.inc"
       start
       test_name SEXTB_1
       mvi r1, 0
       sextb r3, r1
       check_r3 0
       test_name SEXTB_2
       mvi r1, 0x7f
       sextb r3, r1
       check_r3 0x0000007f
       test_name SEXTB_3
       mvi r1, 0x80
       sextb r3, r1
       check_r3 0xffffff80
       end