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POHow to produce optimized assembly from c++ code in visual studio 2010
 

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  1. POHow to produce optimized assembly from c++ code in visual studio 2010
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    <p>I have written a c++ file and i want to output it into assembly. However, I want the assembly to be optimized like the example below: </p> <pre><code>.386 .model flat, c ; Custom Build Step, including a listing file placed in intermediate directory ; but without Source Browser information ; debug: ; ml -c -Zi "-Fl$(IntDir)\$(InputName).lst" "-Fo$(IntDir)\$(InputName).obj" "$(InputPath)" ; release: ; ml -c "-Fl$(IntDir)\$(InputName).lst" "-Fo$(IntDir)\$(InputName).obj" "$(InputPath)" ; outputs: ; $(IntDir)\$(InputName).obj ; Custom Build Step, including a listing file placed in intermediate directory ; and Source Browser information also placed in intermediate directory ; debug: ; ml -c -Zi "-Fl$(IntDir)\$(InputName).lst" "-FR$(IntDir)\$(InputName).sbr" "-Fo$(IntDir)\$(InputName).obj" "$(InputPath)" ; release: ; ml -c "-Fl$(IntDir)\$(InputName).lst" "-FR$(IntDir)\$(InputName).sbr" "-Fo$(IntDir)\$(InputName).obj" "$(InputPath)" ; outputs: ; $(IntDir)\$(InputName).obj ; $(IntDir)\$(InputName).sbr .code _TEXT SEGMENT _p$ = -8 _Array$ = 8 _size$ = 12 ClearUsingPointers PROC NEAR ; ClearUsingPointers, COMDAT ; Line 15 push ebp mov ebp, esp sub esp, 204 ; 000000ccH push ebx push esi push edi lea edi, DWORD PTR [ebp-204] mov ecx, 51 ; 00000033H mov eax, -858993460 ; ccccccccH rep stosd ; Line 17 mov eax, DWORD PTR _Array$[ebp] mov DWORD PTR _p$[ebp], eax jmp SHORT $L280 $L281: mov eax, DWORD PTR _p$[ebp] add eax, 4 mov DWORD PTR _p$[ebp], eax $L280: mov eax, DWORD PTR _size$[ebp] mov ecx, DWORD PTR _Array$[ebp] lea edx, DWORD PTR [ecx+eax*4] cmp DWORD PTR _p$[ebp], edx jae SHORT $L278 ; Line 18 mov eax, DWORD PTR _p$[ebp] mov DWORD PTR [eax], 0 jmp SHORT $L281 $L278: ; Line 19 pop edi pop esi pop ebx mov esp, ebp pop ebp ret 0 ClearUsingPointers ENDP ; ClearUsingPointers _TEXT ENDS END </code></pre> <p>How has the above assembly been generated. The one that i am able to generate is full of garbage(i don't know how else to explain it), How can i shorten it so i can optimize it manually, compile it and run it? BY garbage i am referring to multiple lines like those below. Can i delete them? : </p> <pre><code>PUBLIC ?value@?$integral_constant@_N$0A@@tr1@std@@2_NB ; std::tr1::integral_constant&lt;bool,0&gt;::value PUBLIC ?value@?$integral_constant@_N$00@tr1@std@@2_NB ; std::tr1::integral_constant&lt;bool,1&gt;::value PUBLIC ?value@?$integral_constant@I$0A@@tr1@std@@2IB ; std::tr1::integral_constant&lt;unsigned int,0&gt;::value PUBLIC ?_Rank@?$_Arithmetic_traits@_N@std@@2HB ; std::_Arithmetic_traits&lt;bool&gt;::_Rank PUBLIC ?_Rank@?$_Arithmetic_traits@D@std@@2HB ; std::_Arithmetic_traits&lt;char&gt;::_Rank PUBLIC ?_Rank@?$_Arithmetic_traits@C@std@@2HB ; std::_Arithmetic_traits&lt;signed char&gt;::_Rank PUBLIC ?_Rank@?$_Arithmetic_traits@E@std@@2HB ; std::_Arithmetic_traits&lt;unsigned char&gt;::_Rank ; COMDAT ?end@?$_Iosb@H@std@@2W4_Seekdir@12@B CONST SEGMENT ?end@?$_Iosb@H@std@@2W4_Seekdir@12@B DD 02H ; std::_Iosb&lt;int&gt;::end CONST ENDS ; COMDAT ?cur@?$_Iosb@H@std@@2W4_Seekdir@12@B CONST SEGMENT ?cur@?$_Iosb@H@std@@2W4_Seekdir@12@B DD 01H ; std::_Iosb&lt;int&gt;::cur CONST ENDS ; COMDAT ?beg@?$_Iosb@H@std@@2W4_Seekdir@12@B CONST SEGMENT ?beg@?$_Iosb@H@std@@2W4_Seekdir@12@B DD 00H ; std::_Iosb&lt;int&gt;::beg CONST ENDS ; COMDAT ?binary@?$_Iosb@H@std@@2W4_Openmode@12@B CONST SEGMENT ?binary@?$_Iosb@H@std@@2W4_Openmode@12@B DD 020H ; std::_Iosb&lt;int&gt;::binary CONST ENDS </code></pre>
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    1. USIvan
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    1. COThe code snippet you posted does have 2 assembly directives at the top but the rest of the ';' lines are just comments. Where is the assembly you are looking for?
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      1. USjcopenha
    2. COi have added the rest. But what are those directives and what do they do?
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      1. POHow to produce optimized assembly from c++ code in visual studio 2010
      1. USIvan
    3. COAn assembly directive like `.386` is not exactly optimized code. A modern compiler generates `.686P` and `.XMM`. No idea where this came from, probably something old.
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      1. POHow to produce optimized assembly from c++ code in visual studio 2010
      1. USHans Passant
 

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