The only thing that would avoid this is to either tell the compiler to never put esi/edi in memory (which I think is not possibly across different versions of gcc) or to always generate a single asm section for all the different cases.
Use __asm__ ("%esi") and __asm__ ("%edi"). It is not guaranteed that they access the registers always (you can still have copy propagation etcetera); but, if your __asm__ statement constraints match the register you specify, then you can be reasonably sure that good code is produced.
Paolo
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