I have been using the GCC Compiler for months, which is great, and works very well. But I wonder which C++ Compiler do big/medium enterprises use for high optimizations/performance in Linux (x86, PowerPC...).
As far as I know, the best PowerPC Compiler is the XL, but x86 I dont know anything.
In the places I have worked we have always used gcc, even for embedded applications/software.
Performance improvements are much more likely to come from your code rather than your compiler choice anyway!