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--- en:edu:zmitac:s1:apl:lab:lab3 [2024/12/03 11:21] – ktokarz
+++ en:edu:zmitac:s1:apl:lab:lab3 [2024/12/03 14:40] (current) – [Tasks to be done during laboratory] ktokarz
@@ Line 39: / Line 39: @@
 .data
 SourceDataString DB 'AGIKSZJ', 0FFH	; source string definition
-DestinBaseString DB '       ', 0FFH ; buffer for destination string
+DestinBaseString DB '       ', 0; buffer for destination string, null terminated
-DestinIndexString DB '       ', 0FFH ; buffer for destination string
+DestinIndexString DB '       ', 0; buffer for destination string, null terminated
-DestinDisplString DB '       ', 0FFH ; buffer for destination string
+DestinDisplString DB '       ', 0; buffer for destination string, null terminated
 .code
@@ Line 119: / Line 119: @@
 </code>
+*def file*
+<code>
+LIBRARY JaAsm
+EXPORTS CopyString_base
+EXPORTS CopyString_base_index
+EXPORTS CopyString_base_disp
+</code>
 ===== Tasks to be done during laboratory =====
-  - Compile the example code and observe its behaviour. Set the breakpoint at the beginning of the code and see how the contents of the registers change with every loop pass.
+. Compile the example code and observe its behaviour. Set the breakpoint at the beginning of the code and see how the contents of the registers change with every loop pass.\\
-  - Make the function more universal: define the string in a C++ file and pass its address as the parameter to the function. Pass the character as the second parameter.
+. Observe the content of the memory at the beginning address of the source string. Look if other strings are filled properly.\\
-  - Rewrite the search algorithm with vector instructions (SSE, or AVX). Suggest what to do if the string length is not a multiple of register size.
+. Write the version of the assembler function which copies the source to a destination string using chosen string instruction with repetition (use REP prefix).
-  - Compare execution time for scalar (normal) instructions and vector instruction for the same string.
+===== For the report =====
+. Put in the report a screenshot of the window with the results displayed (memory dump with copied texts).\\
+. Explain differences in addressing modes used in the functions. Explain what is the result of the line:
+<code>
+Address_difference EQU DestinDisplString - SourceDataString
+</code>
+. Include the code of your new function written in assembler WITH COMMENTS. Also, add a screenshot of the window with the results displayed (copied texts).