WEBVTT 00:00.430 --> 00:06.880 As we approach the final lecture of this section, we encounter the assembly language instruction j 00:06.980 --> 00:10.360 p jump if below or equal. 00:11.680 --> 00:18.850 An essential command that guides the path of programs execution based on a particular comparison condition. 00:19.210 --> 00:24.550 In this section, you have been gradually building a foundation of understanding for assembler language, 00:24.550 --> 00:29.710 and the JB instruction is another stepping stone in this journey. 00:29.920 --> 00:35.980 Understanding its role and significance will serve as a bridge as you transition to the next section 00:35.980 --> 00:43.270 where we will harness the knowledge gained here to craft more advanced and sophisticated assembler programs. 00:44.970 --> 00:52.320 Imagine you are reading a book and instruction is like a crossroads in the story, a point where the 00:52.320 --> 00:56.430 plot takes a different direction depending on certain condition. 00:56.460 --> 01:03.300 Similarly, in assembly language programming, the JB jump if below or equal instruction serves as a 01:03.300 --> 01:05.430 decision making tool. 01:05.580 --> 01:08.460 Now here is how it operates. 01:10.610 --> 01:14.240 Comparing results or comparing values. 01:14.240 --> 01:22.520 So just like comparing two cups of water to see, which has more, the J.B. instruction compares two 01:22.520 --> 01:23.160 values. 01:23.180 --> 01:27.590 These values could be numbers stored in different places in your computer's memory. 01:28.240 --> 01:29.930 Making a decision. 01:29.950 --> 01:34.510 The instruction then helps your computer decide what to do next. 01:34.510 --> 01:38.320 If the first value is less than or equal to the second value. 01:38.350 --> 01:43.360 The JB instruction tells the computer to take a different path. 01:43.540 --> 01:44.620 A jump. 01:45.810 --> 01:48.660 Jump or continue if the condition is met. 01:48.690 --> 01:52.350 Your program jumps to a new section of the code. 01:52.380 --> 01:55.590 Like turning to a different chapter in a book. 01:56.080 --> 02:02.740 If the condition isn't met, the program just keeps going in order, like reading throughout the book 02:02.740 --> 02:04.240 page by page. 02:04.840 --> 02:10.960 As we conclude this section with GBA instruction, remember that you have learned here sets the stage 02:10.960 --> 02:12.900 for what's coming next. 02:13.210 --> 02:14.080 Next. 02:14.080 --> 02:19.480 And in the upcoming section, you will take the knowledge you have gained and use it to create more 02:19.480 --> 02:22.210 intricate and sophisticated assembly programs. 02:22.210 --> 02:30.700 Just as books final chapters prepares you for the sequel, your understanding of GBC paves the way for 02:30.700 --> 02:36.670 the exciting challenges and achievements that await you in your assembly programming journey. 02:36.790 --> 02:45.250 Now let's, as we always do, let's create some code and understand our deeper way. 02:50.830 --> 02:54.100 Let's firstly get started by writing section. 02:55.060 --> 02:55.320 Here. 02:56.390 --> 03:06.260 Uh, section data are value one db 15 value two DB 20. 03:06.440 --> 03:08.750 So we are allocating in. 03:09.840 --> 03:15.300 Here we are allocate memory for value one and initialize it with 15. 03:15.300 --> 03:19.020 And here we are doing the same, but we are initializing it with 20. 03:19.230 --> 03:22.530 Now we are going to section text. 03:23.330 --> 03:26.330 Text and global start. 03:26.330 --> 03:34.550 And in the start here we will load the value stored at memory address value one into al. 03:39.620 --> 03:47.180 Value one and we will load the value stored at memory address value two into pl move. 03:47.780 --> 03:48.080 PL. 03:49.550 --> 03:50.570 Value to. 03:51.550 --> 04:02.440 And here we will compare the value in A and B with this p, a, l, p, l, and after that we will use 04:02.440 --> 04:04.870 this j p. 04:05.740 --> 04:05.920 E. 04:08.410 --> 04:08.780 J. 04:08.830 --> 04:09.310 B. 04:09.910 --> 04:10.260 J. 04:10.300 --> 04:12.310 B below. 04:13.230 --> 04:13.800 Or. 04:15.660 --> 04:16.200 Equal. 04:17.540 --> 04:18.810 And here we are. 04:18.840 --> 04:26.180 Uh, we are performing a comparison between the values in A, L and b, l, and here we are. 04:26.690 --> 04:27.310 Jump. 04:27.320 --> 04:36.890 We are telling the assembly to jump to below or equal if l is below or equal to b l, and after that 04:36.920 --> 04:42.650 we will write not below or equal label. 04:42.650 --> 04:55.060 And here you will insert in insert your code here, put here to code here and in this case. 04:55.070 --> 05:02.810 So in this case, this means that value one is not below or equal to value. 05:02.810 --> 05:16.580 Two value one is not below or equal or equal to value to value two And we will also create this below 05:16.580 --> 05:17.700 or equal label. 05:19.490 --> 05:24.670 Below or equal label where our condition is met. 05:24.680 --> 05:29.210 So insert your code here. 05:29.480 --> 05:33.200 So let's fix that your code here. 05:33.530 --> 05:34.910 So if we. 05:38.420 --> 05:45.050 If you make this like change the value to 2020 here because it also it will be more logical for this 05:45.050 --> 05:45.670 example. 05:45.680 --> 05:50.060 But yes, we can also do 15 or 20 so we can do whatever value we want. 05:50.810 --> 05:52.310 Your code here. 05:52.310 --> 05:59.780 So where value one is below or equal to value two. 06:01.250 --> 06:02.030 And that's it. 06:02.030 --> 06:06.470 So here we need to create this down here. 06:07.690 --> 06:10.840 Here, we will insert our exit code. 06:12.280 --> 06:13.690 Here in. 06:14.780 --> 06:18.590 Insert your exit code here. 06:18.770 --> 06:20.990 And now let's. 06:22.630 --> 06:25.850 Explain this in more technical way here. 06:25.850 --> 06:30.870 So in this data section, memory allocation, Memory. 06:30.890 --> 06:41.750 Memory allocation is dedicated to value one which which here which value one is initialized with 20 06:41.750 --> 06:50.870 and here we in value two we are doing the same, which is similarly memory is allocated for value two 06:50.870 --> 06:52.760 and initialized to. 06:53.710 --> 06:55.450 20 as well. 06:56.130 --> 06:57.720 And after that. 06:58.780 --> 07:07.180 Uh, in this start, our process commences with the move instruction responsible for loading the byte 07:07.180 --> 07:14.860 size value, uh, from memory location value one into the Al register. 07:14.860 --> 07:21.670 And in parallel the Move instruction accomplishes the same loading the byte size value from memory location 07:21.670 --> 07:30.880 value two into the Belle Register and here we the CMP instruction carries out a meticulous comparison 07:30.880 --> 07:34.570 between the contents of Al and Belle registers. 07:34.570 --> 07:43.930 And here the after that the JB The decision making aspect of our journey unfolds with the J.B., which 07:43.930 --> 07:46.240 is jump if below or equal instruction. 07:46.240 --> 07:56.040 It gets us to the below or equal label if a a al is below or equal to Belle. 07:56.320 --> 08:05.660 And after that here for this segment provides you with the technical canvas to implement codes specifically 08:05.660 --> 08:11.180 tailored to a scenarios where value one is not below or equal to value. 08:11.180 --> 08:11.840 Two. 08:12.610 --> 08:18.160 And here in below or equal label we have in the space. 08:18.160 --> 08:25.540 Your technical prowess takes center stage allowing you to craft code addressing scenarios where value 08:25.570 --> 08:26.410 has value. 08:26.410 --> 08:31.270 One is indeed below or equal to value two and in done. 08:31.480 --> 08:39.820 This is the conclusion of our journeys marked by the down label indicating the final stage of our program's 08:39.850 --> 08:40.750 execution. 08:41.780 --> 08:49.460 And as we navigate this assembly code, we navigate the intricate arrays of conditional branching and 08:49.460 --> 08:56.510 comparisons encapsulating scenarios where value one is either below or equal to value. 08:56.510 --> 08:57.110 Two.