added another exercise to if

section_1/if/if06.s

@@ -0,0 +1,41 @@
+    .global main					// Expose 'main' to the linker.
+    .text							// Specify what comes next is code.
+
+/*	Perry Kivolowitz
+	Assembly Language Programming Made Not So Scary
+	
+	if06.s - demonstrating an IF statement.
+
+	This program will compare 5 to 10. If 5 is larger
+	(it isn't), the program will print TRUE. If 10 is
+	larger than 5 (it is), the program will print
+	FALSE.
+*/
+
+main:
+    str     x30, [sp, -16]!			// Preserve x30 due to function call.
+    mov     x1, 10					// b gets 10
+    mov     x0, 5					// a gets 5
+
+    cmp     x0, x1					// a - b ... 5 - 10 makes negative 5.
+    ble     1f						// If b >= a, thake the branch.
+    ldr     x0, =T					// a is greather than b - load the
+									// address of TRUE string into x0
+    b       2f						// Skip over prepping FALSE
+
+1:  ldr     x0, =F 					// x0 contains a pointer to the 
+									// correct string either way.
+2:  bl 		puts					// Print the string with a new line.
+
+	ldr     x30, [sp], 16			// Restore x30 so we can return.
+    mov     x0, xzr					// Indicate success to the caller.
+    ret								// Return back to the caller.
+
+    .data							// What comes next is data.
+F:  .asciz  "FALSE"					// Null terminated C string.
+T:  .asciz  "TRUE"					// Null terminated C string.
+
+    .end							// Tells the assembler that it
+									// should emit an error if any
+									// more data or instructions
+									// come after.