WEBVTT 00:00.350 --> 00:06.470 Hello, my name is Stephen and welcome to a captivating lecture that delves into the heart of assembly 00:06.470 --> 00:07.340 language. 00:07.340 --> 00:15.170 And in this session we are immersing ourselves in the intricate world of instruction, flags and their 00:15.170 --> 00:18.230 profound influence on conditional jumps. 00:18.230 --> 00:26.360 So brace yourselves for an enlightening journey as we meticulously dissect each instruction, unraveling 00:26.360 --> 00:31.150 the signal and unveiling their impact on a program flow. 00:31.160 --> 00:38.180 So without further ado, let's embark on this exciting addition to the realm of instruction, flags 00:38.180 --> 00:39.860 and conditional jumps. 00:39.860 --> 00:44.060 Now we will create a new project folder for this lecture here. 00:44.300 --> 00:50.480 Let's name it the instruction flags and. 00:51.220 --> 00:53.260 And instruction flags and. 00:54.790 --> 00:57.220 Uh, con jumps here. 01:02.540 --> 01:02.990 Yeah. 01:03.380 --> 01:05.030 And jumps here. 01:05.150 --> 01:06.020 That's it. 01:06.050 --> 01:09.470 Now we will here create the default. 01:09.470 --> 01:15.260 Or actually, let's open the terminal here just as a CSM here. 01:17.030 --> 01:18.070 Create a new project. 01:18.080 --> 01:20.270 Let's do the default project here. 01:20.300 --> 01:27.560 Save this in instruction flags and jumps as the project dot ASM. 01:33.120 --> 01:37.610 And here we will start with the g e here. 01:37.620 --> 01:40.260 This means jump if equal. 01:40.260 --> 01:43.500 So our voyage begins with an introduction. 01:43.630 --> 01:47.380 G is an abbreviation for jump if equal. 01:47.420 --> 01:54.420 Here G is jump if equal. 01:54.420 --> 02:01.080 So this instruction plays a pivotal role in facilitating decisions based on equality conditions. 02:01.080 --> 02:09.810 So it hinges on the zero flag z, F and the key indicator of whether the previous operation resulted 02:09.810 --> 02:11.640 in an equal comparison. 02:11.640 --> 02:17.580 Regardless of whether we are dealing with a signed or unsigned numbers, the g e instruction empowers 02:17.580 --> 02:23.730 us to gracefully navigate program flow when two values are equal. 02:23.730 --> 02:26.360 So this means jump if equal. 02:26.370 --> 02:33.550 So now we will also create an example code for this and I will explain this example code further and 02:33.550 --> 02:34.240 you will learn. 02:34.690 --> 02:38.800 Learn everything you need to know about g jump if equal here. 02:38.800 --> 02:43.030 So section data we will create a two value. 02:43.750 --> 02:50.200 This is the byte with value ten and we will define another byte with the value ten again. 02:50.200 --> 02:56.440 So value one db ten value value two. 02:57.240 --> 02:59.300 Be ten again. 03:02.740 --> 03:07.420 Then and here we will develop our text section here. 03:07.420 --> 03:09.730 In text section we will global. 03:12.600 --> 03:13.470 Global. 03:14.370 --> 03:17.100 Start and in start. 03:17.990 --> 03:18.590 Here. 03:21.910 --> 03:28.930 Start, we will move the value of value one into a register here. 03:34.630 --> 03:35.660 A l. 03:37.630 --> 03:40.120 Uh, value one. 03:41.550 --> 03:43.380 And we will move. 03:44.250 --> 03:46.220 L two. 03:47.670 --> 03:48.870 Value to. 03:50.120 --> 03:56.570 And now we will compare the values in al and bl cmp. 03:58.010 --> 03:58.970 Al. 03:59.850 --> 04:01.160 And Bell. 04:09.120 --> 04:19.200 And this is we wrote this because of the comparing the values in L and L, and we will use G here and 04:19.200 --> 04:22.470 we will write equal font. 04:22.830 --> 04:28.500 So this we are jumping the equal font label if they are equal. 04:28.500 --> 04:32.640 But if they are not equal, we will create this new line here. 04:32.670 --> 04:34.470 Not equal. 04:34.500 --> 04:47.430 So here in this case, your code or code here for not equal case and after the case ends, jump done. 04:47.460 --> 04:50.970 So now we are jumping to the done label. 04:50.970 --> 05:02.760 And if the equal is font here, equal font here and here, you will also your code here. 05:03.870 --> 05:06.570 Here for equal. 05:07.340 --> 05:08.150 Case. 05:11.310 --> 05:12.990 Case and after that. 05:13.770 --> 05:14.460 Again. 05:18.950 --> 05:24.050 And after that, you will need to write your exit code here. 05:24.140 --> 05:32.840 So that's it with our jump if equal instruction here and I'm waiting you in next lecture. 05:32.840 --> 05:39.740 So remember that we wrote this code in 32 bit assembly in ACM x86. 05:39.860 --> 05:40.810 32 bit. 05:40.820 --> 05:44.780 So that's why we have two characters instead of three here. 05:44.780 --> 05:50.870 And in next lecture we will also try 64 bit for this testing here. 05:50.870 --> 05:52.370 So I'm waiting you in next lecture.