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copied!<p>There is absolutely nothing reliable about the relationship between C++ code and what machine code a compiler generates. </p> <p>Some people say "in my experience ... etc. etc. etc." but this is more unreliable than you may realize. Not many people have actual experience in any substantial cross-section of all the possible compiler/architecture combinations. [Edit: I think that <a href="https://stackoverflow.com/users/53543/crashworks">Crashworks</a> proves me wrong though. :-)]</p> <p>Consider the following <a href="http://en.wikipedia.org/wiki/GNU_Compiler_Collection" rel="nofollow noreferrer">list of C++ compilers</a>:</p> <ul> <li>C++ Builder</li> <li>Turbo C++ Explorer</li> <li>C++ Compiler</li> <li>Borland C++</li> <li>Turbo C++ for DOS</li> <li>Clang</li> <li>Comeau C/C++</li> <li>CoSy compiler development system</li> <li>Digital Mars</li> <li>Djgpp</li> <li>EDGE ARM C/C++</li> <li>MinGW</li> <li>GCC C++ (G++)</li> <li>HP aC++</li> <li>Intel C++ Compiler</li> <li>Microtec</li> <li>MULTI</li> <li>Open Watcom</li> <li>Open64</li> <li>PathScale</li> <li>PGI Workstation</li> <li>ProDev WorkShop</li> <li>RealView C/C++ Compiler (armcc)</li> <li>SAS/C C++</li> <li>Sun Studio</li> <li>TenDRA</li> <li>VectorC</li> <li>Visual C++</li> <li>VisualAge C++</li> <li>XL C/C++</li> </ul> <p>Now multiply this list by the following <a href="http://en.wikipedia.org/wiki/GNU_Compiler_Collection" rel="nofollow noreferrer">short list of machine architectures</a>:</p> <ul> <li>ARM </li> <li>Atmel AVR </li> <li>Blackfin </li> <li>HC12 </li> <li>H8/300 </li> <li>IA-32 (x86) </li> <li>x86-64 </li> <li>IA-64 </li> <li>Motorola 68000 </li> <li>MIPS </li> <li>PA-RISC </li> <li>PDP-11 </li> <li>PowerPC </li> <li>R8C/M16C/M32C </li> <li>SPU </li> <li>System/390/zSeries </li> <li>SuperH </li> <li>SPARC </li> <li>VAX </li> <li>A29K </li> <li>ARC </li> <li>ETRAX CRIS </li> <li>D30V </li> <li>DSP16xx </li> <li>FR-30 </li> <li>FR-V </li> <li>Intel i960 </li> <li>IP2000 </li> <li>M32R </li> <li>68HC11 </li> <li>MCORE </li> <li>MMIX </li> <li>MN10200 </li> <li>MN10300 </li> <li>Motorola 88000 </li> <li>NS32K </li> <li>ROMP </li> <li>Stormy16 </li> <li>V850 </li> <li>Xtensa </li> <li>AVR32 </li> </ul> <p>Now multiply by operating system and optimization flags, and you may find that everyone's experience is woefully lacking.</p>

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