On 18.04.2005, at 11:51, Ian Rogers wrote:
I'm not sure if you can get GCC to generate code sequences like this, but you probably at least need to use the -fprofile-generate and -fprofile-use options
http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
Feedback optimisation (FDO) will not work for two reasons: a) qemu itself is something like a realtime compiler so FDO will only speed up the compiler but not the generated code b) FDO will only provide speed boosts if the feedback phase has a chance to analyse a representative work pattern that is hopefully also repetitive
After all FDO is mostly about making a tradeoff size/speed and rearranging code (mostly branches) to avoid branch mispredictions of the CPU.
Servus,
Daniel
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