WEBVTT 00:00.770 --> 00:05.870 Hello, my name is Typhoon and in this lecture you will learn about the jump if less or equal. 00:05.900 --> 00:14.030 So jump if less or equal j l e is a conditional jump instruction in assembly language programming that 00:14.060 --> 00:18.320 directs the flow of execution based on a comparison condition. 00:18.410 --> 00:25.400 This instruction is commonly used to make decisions within programs by evaluating whether one value 00:25.400 --> 00:28.790 is less than or equal to another value. 00:28.820 --> 00:34.910 It's particularly relevant in scenarios where signed integer comparison is involved. 00:34.940 --> 00:41.330 So the first stage here, the instruction follows this general process. 00:41.390 --> 00:43.070 The comparison. 00:43.190 --> 00:48.760 The instruction begins by performing a comparison between two values. 00:48.770 --> 00:55.220 So these values would be stored in registers, memory locations or immediate values. 00:55.940 --> 00:57.440 The instruction itself. 00:59.000 --> 01:00.650 The second is conditional check. 01:00.680 --> 01:07.420 The result of the comparison is then used to determine whether the jump should occur in the case of 01:08.150 --> 01:10.880 the jump will take place if either of two. 01:11.990 --> 01:12.320 Matt. 01:13.630 --> 01:20.830 So the first is the first condition is the zero flag is there. 01:20.890 --> 01:24.040 Zero flag is set to one. 01:24.460 --> 01:36.880 This indicating that the values are equal or the sign flag is F sign flag and the and overflow flag. 01:37.560 --> 01:46.850 Like have have the same value, so indicating that the result is negative or equal. 01:46.860 --> 01:47.670 So. 01:50.510 --> 01:51.320 Equal. 01:52.560 --> 01:53.490 And. 01:58.400 --> 02:00.920 There are negative. 02:01.570 --> 02:05.080 And or negative or equal. 02:07.590 --> 02:15.300 And the last is if either of the conditions mentioned above is satisfied, the program's execution flow 02:15.300 --> 02:22.260 is altered and it jumps to a new location specified by a label or memory address. 02:22.290 --> 02:29.910 If the conditions are not met, the program continues executing the subsequent instruction sequentially 02:29.910 --> 02:33.360 without any alteration to its flow. 02:33.780 --> 02:38.640 Now we will, as we always do in this section, we will write another code. 02:39.030 --> 02:40.980 Uh, considering. 02:41.750 --> 02:42.340 This. 02:42.440 --> 02:48.890 Um, and we will build project something like jump if less or we will use this, uh, jelly here. 02:49.160 --> 02:50.480 So now. 02:51.310 --> 02:53.860 Let's get started with this here. 02:58.090 --> 03:01.390 Of course, as we always do, we will. 03:01.540 --> 03:02.500 Uh, firstly. 03:04.450 --> 03:09.070 So let's in this lecture, let's actually write our. 03:11.310 --> 03:13.410 Port with using. 03:13.410 --> 03:19.350 Yeah, we can also use this print f so we make it more functional in this lecture. 03:20.040 --> 03:23.730 But it might take a long time, but you will understand it better. 03:26.670 --> 03:30.810 Or instead of writing print f uh, which is not required at all. 03:30.810 --> 03:35.070 Uh, the in this lecture you will learn the logic and. 03:36.040 --> 03:39.190 Usage of this jar and indents. 03:39.190 --> 03:47.230 In next sections, we will develop our programs according to the, according to this, uh, logical 03:47.230 --> 03:49.060 conditions here and now. 03:49.060 --> 03:50.740 We will as always do. 03:51.310 --> 03:54.100 Uh, we will firstly define the section data. 03:54.340 --> 04:02.380 Uh, here in this data we will allocate memory for value one and initialize it with 15 value. 04:03.090 --> 04:06.480 Value of one DB and 15. 04:06.480 --> 04:12.990 And again, we will allocate memory for value two and initialize it to 15 again. 04:12.990 --> 04:18.680 And here we will create a section text Global Start. 04:18.680 --> 04:22.860 This is the starting point for our program and in start here. 04:24.060 --> 04:24.480 Art. 04:24.870 --> 04:25.500 We will. 04:26.340 --> 04:28.200 Move, Al. 04:29.850 --> 04:31.980 Uh, to value one. 04:34.990 --> 04:35.950 So we are moved. 04:36.250 --> 04:43.750 We are moving the value at memory address value one into the Al and we are doing the same for BL here. 04:43.750 --> 04:49.360 So we are moving the value at memory address value two into the BL. 04:51.610 --> 05:01.810 And here we are going to compare the result, compare the values in L and b, L, cmp, L and b, l. 05:02.860 --> 05:05.050 And we will use the jump if less. 05:05.050 --> 05:07.100 Or equal jelly. 05:08.380 --> 05:12.430 Uh, less or equal equal here. 05:12.430 --> 05:24.010 So here we will jump to less or equal if l is less than or equal to equal to b l, And here we will 05:24.010 --> 05:29.020 write note we will first create a note less or. 05:29.850 --> 05:31.320 Equal here. 05:31.350 --> 05:33.540 So your code. 05:34.170 --> 05:45.510 Here for the case when value one is not less than or equal to value two here. 05:45.510 --> 05:46.050 Right? 05:46.050 --> 05:56.880 So value two and we are going to jump to done done to conclude this section and we will also develop 05:56.910 --> 05:57.690 done here. 05:57.690 --> 05:59.850 Jump JMP done. 06:00.570 --> 06:01.470 And. 06:02.190 --> 06:05.970 We will create a less or equal. 06:07.290 --> 06:18.960 So your code here for for the case when value one is less than or equal actually. 06:21.320 --> 06:21.680 So. 06:24.190 --> 06:29.260 Is not less and here is less than or equal to value. 06:29.260 --> 06:34.690 One value one or value value two. 06:34.930 --> 06:41.530 Let's make this not uppercase to make sure shown yes less than or equal to. 06:41.530 --> 06:44.560 And we will create our exit code. 06:47.710 --> 06:51.130 And this is your exit code here. 06:51.130 --> 06:58.810 And in this session, we are about to embark on an in-depth journey through the assembly code here. 06:58.810 --> 07:00.010 And our. 07:01.010 --> 07:06.620 Goal is to meticulously analyze each line and unravel the logic behind the conditional branching and 07:06.620 --> 07:07.640 comparisons. 07:07.700 --> 07:11.030 So let's begin this and here. 07:12.000 --> 07:18.540 Our journey commences with the declaration of the data section where, um, we allocate memory to store 07:18.540 --> 07:21.660 two variables value one and value two. 07:21.660 --> 07:24.500 Both variables are initialized to 15. 07:24.510 --> 07:30.390 So setting the stage for our comparison again and transitioning to the text section where executable 07:30.390 --> 07:36.990 instructions reside, the Start label serves as our global entry point, as I always say. 07:37.410 --> 07:41.100 Um, and we start by employing this move again. 07:41.850 --> 07:48.450 Uh, move instruction to load the value residing in memory at the address pointed to by value one into 07:48.450 --> 07:49.800 the al register. 07:49.800 --> 07:56.190 Similarly, move instruction transfers the value from the memory location pointed to value two into 07:56.190 --> 07:57.900 the Belle Register. 07:57.960 --> 08:04.720 Following this instruction undertakes a comparison between the value stored in Al and b l. 08:04.770 --> 08:13.480 If the comparison determines that the value in Al is less than or equal to the value in b l, we proceed 08:13.480 --> 08:15.190 to the less. 08:16.180 --> 08:18.310 Or equal labor. 08:18.520 --> 08:24.820 So in scenarios where the comparison result indicates that the value in Al is not less than or equal 08:24.820 --> 08:31.600 to value on PL, we danced to the not less or equal section here. 08:31.600 --> 08:37.540 You will typically insert your custom set of instructions to handle cases where value one is not less 08:37.540 --> 08:38.920 than or equal to value. 08:38.920 --> 08:39.370 Two. 08:39.460 --> 08:43.480 Subsequently, GMP uh, done here. 08:43.630 --> 08:49.900 Uh, instruction enables us to bypass the less or equal to actually. 08:49.900 --> 08:50.470 Yeah, less. 08:50.470 --> 08:51.610 Or equal to. 08:52.500 --> 08:57.180 Uh section and head directly to done label. 08:57.180 --> 09:04.830 And conversely, when the comparison, uh, confirms that the value in Al is indeed less than or equal 09:04.860 --> 09:09.000 to the value in B, we proceed to the less or equal label. 09:09.000 --> 09:15.450 So with this segment, you will typically insert instructions to be executed when value of one is less 09:15.450 --> 09:17.130 than or equal to value. 09:17.130 --> 09:17.600 Two. 09:17.610 --> 09:25.140 And our journey culminates at the done label marking at the end of our program Logic. 09:25.290 --> 09:33.240 So this is the ideal location to include instructions for program termination or any necessary cleanup 09:33.480 --> 09:36.840 might involve system calls or resource management. 09:36.960 --> 09:39.570 And that's it with our lecture. 09:39.900 --> 09:42.750 Uh, jump if less or equal here. 09:42.750 --> 09:43.530 So. 09:44.550 --> 09:45.420 This, actually. 09:46.930 --> 09:48.730 Like, almost. 09:49.780 --> 09:55.420 The chord structure is almost the same as previous ones, but here the logic is different. 09:55.420 --> 09:57.460 So I'm waiting you in next lecture.