WEBVTT 00:00.800 --> 00:05.330 Hello, my name is Typhoon, and in this lecture you will learn about the jump if greater. 00:05.330 --> 00:10.670 So continuing our exploration, we arrive at a doorstep of G. 00:10.710 --> 00:11.090 G. 00:11.690 --> 00:16.190 This is a cryptic command denoting jump if greater. 00:16.190 --> 00:23.270 So this particular instruction orchestrates a sophisticated dance involving the sign flag. 00:23.310 --> 00:25.410 This the SF? 00:26.300 --> 00:27.280 This is the. 00:28.770 --> 00:30.300 Sign flag. 00:30.940 --> 00:34.570 Uh, the over flag and the zero flag also. 00:34.690 --> 00:42.160 So they are combined Symphony orchestra is to result in zero signifies a clear message. 00:42.190 --> 00:45.190 The result is not less than or equal to. 00:45.310 --> 00:53.380 So with a G we find ourselves embarking on an expedition through sound comparisons, skillfully handling 00:53.380 --> 00:58.140 situations where one value genuinely surpasses another. 00:58.150 --> 00:59.020 So. 01:00.020 --> 01:08.180 As I said, we are involving here sign flag, the overflow flag and zero flag as well. 01:08.270 --> 01:16.130 And here we will create another example of our coding example here, just with just like we did in previous 01:16.130 --> 01:16.850 lectures. 01:16.850 --> 01:19.880 So we will create a section data fastly. 01:20.300 --> 01:30.950 The we will create define a byte with a value of 30 while value one db 30 here value two db. 01:31.890 --> 01:35.280 20, we are defining another byte with a value of 20. 01:35.280 --> 01:39.030 And here we will write our text here. 01:39.060 --> 01:40.080 Global. 01:48.730 --> 01:53.200 And here we will write a start here. 01:55.500 --> 01:55.940 Move. 01:56.950 --> 01:57.730 Al. 01:58.560 --> 01:59.330 Bite. 02:00.330 --> 02:01.380 Value of one. 02:01.410 --> 02:09.000 Here we are moving the value of, um, value of value one into the al register. 02:09.000 --> 02:09.690 And. 02:09.690 --> 02:12.960 And here, move dl. 02:14.010 --> 02:14.760 Fight. 02:16.940 --> 02:17.590 White. 02:18.870 --> 02:20.640 Value two. 02:20.760 --> 02:28.140 And here we are moving the value of value two into the B register. 02:28.140 --> 02:37.560 And now we are comparing the values in A and B In order to do that, we will use the CMP, L and L, 02:37.920 --> 02:43.410 and after that we will use the G here, G. 02:45.780 --> 02:49.200 Here and name the label. 02:51.950 --> 02:53.870 Big greater. 02:53.870 --> 02:55.660 So here we are. 02:55.810 --> 02:56.330 Jump. 02:56.450 --> 03:00.200 We are telling the assembly code that jump two reader. 03:00.290 --> 03:01.400 Reader label. 03:01.400 --> 03:05.330 If a L is greater than b l. 03:05.330 --> 03:09.200 So if it's not great, we will also write this label here. 03:09.200 --> 03:10.250 So not. 03:10.980 --> 03:11.450 Sir. 03:11.880 --> 03:20.040 So this case, you will write your code here, your code here for not reader case. 03:20.040 --> 03:23.430 And as well we will jump. 03:23.460 --> 03:26.550 GMP, GMP done here. 03:26.640 --> 03:32.550 So we are giving the jump to the done label in this case. 03:32.550 --> 03:35.780 So if it's not greater, you need to jump to the done label. 03:35.790 --> 03:39.270 But first let's actually write the greater label. 03:39.360 --> 03:51.270 So reader, this case the we are your code here for reader case and we will also need to write a done 03:51.270 --> 03:55.050 here since we are jumping to the done label here. 03:56.010 --> 03:58.050 So we are obligated to write it. 03:58.050 --> 04:01.260 So here we are At first we are exit. 04:05.820 --> 04:09.810 And it will move racks fixed. 04:10.140 --> 04:14.160 As you already know, we use it almost 100 times. 04:14.160 --> 04:19.130 This is a fiscal number for exit and X or D. 04:21.160 --> 04:23.710 This is the exit status zero. 04:23.710 --> 04:25.720 And after that, we will call the Cisco. 04:25.750 --> 04:26.560 That's it. 04:27.400 --> 04:27.730 Here. 04:27.730 --> 04:31.930 I will explain this again from the start here. 04:31.930 --> 04:39.580 So in data section we here, we have two values are defined value one and value two the value value 04:39.580 --> 04:48.100 one is defined as a byte with the value of 30 and value two is defined as a byte with the value of 20. 04:48.130 --> 04:50.410 And we have the text section here. 04:50.410 --> 04:54.550 This text section contains the actual code of the program, as you know here. 04:54.550 --> 05:01.480 So the Start label is the entry point of the program and we also have the loading values here. 05:01.480 --> 05:03.130 This move instructions. 05:05.570 --> 05:14.120 The move Al byte value one instruction loads the value of value one into the Al register. 05:14.150 --> 05:19.940 It uses the byte keyword to indicate that only a single byte is being loaded. 05:19.940 --> 05:29.900 And similarly the byte value two loads, the loads, the value of value two into the Belle Register 05:29.900 --> 05:30.590 as well. 05:31.310 --> 05:37.550 And again, we are using this byte keyword to indicate that only a single byte is being loaded. 05:37.550 --> 05:41.510 And here we also have CMP instruction. 05:41.990 --> 05:51.320 This the CMP ILB instruction compares the values in the A, L and b l register, and this comparison 05:51.320 --> 05:59.270 sets various flags, including the ZF0 flag, which indicates whether the two values are equal. 05:59.270 --> 06:03.110 And here we also have the conditional jump here. 06:03.470 --> 06:04.220 This. 06:05.400 --> 06:09.710 Uh, g g g g instruction. 06:10.230 --> 06:17.490 So this, uh, g greeter instruction checks the result of the comparison. 06:17.490 --> 06:29.400 And if the Z is F is not set because a g f is greater than b, L, it jumps to the greeter label. 06:29.400 --> 06:34.050 Otherwise it falls through to not greeter label. 06:34.050 --> 06:39.900 And we have the labels here, uh, this greeter greeter and not greeter. 06:40.710 --> 06:47.520 So the greeter label is where you can write code that executes when value one. 06:48.960 --> 06:59.190 Is greater than value two and the not greater label is for writing code that executes when value one 06:59.190 --> 07:01.390 is not greater than value two. 07:01.410 --> 07:04.200 So the value two is greater than value one. 07:04.200 --> 07:09.090 And at the end of it we have this done label. 07:09.480 --> 07:16.740 The program flow reaches the done label after executing the relevant code based on the comparison and 07:16.740 --> 07:19.540 we have mov rax 60. 07:19.560 --> 07:23.640 This instruction sets the syscall number for the exit system call. 07:23.670 --> 07:26.400 We have X or die or die. 07:26.430 --> 07:33.360 This clears the die register as well as this is the exit status parameter and the syscall instruction 07:33.360 --> 07:37.350 performs the exit syscall terminating the program. 07:37.350 --> 07:44.250 So this code demonstrates this example of using conditional branching in assembly to execute different 07:44.250 --> 07:48.880 code path paths based on the result of the comparison. 07:48.880 --> 07:52.600 So that's it with our lecture, and I'm waiting you in the next lecture.