Revision 107a47cc

b/tcg/README
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- Don't hesitate to use helpers for complicated or seldom used target
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  instructions. There is little performance advantage in using TCG to
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  implement target instructions taking more than about twenty TCG
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  instructions.
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  instructions. Note that this rule of thumb is more applicable to
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  helpers doing complex logic or arithmetic, where the C compiler has
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  scope to do a good job of optimisation; it is less relevant where
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  the instruction is mostly doing loads and stores, and in those cases
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  inline TCG may still be faster for longer sequences.
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- The hard limit on the number of TCG instructions you can generate


  		





  
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  per target instruction is set by MAX_OP_PER_INSTR in exec-all.h --


  		





  
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  you cannot exceed this without risking a buffer overrun.


  		





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- Use the 'discard' instruction if you know that TCG won't be able to


  		





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  prove that a given global is "dead" at a given program point. The


  		












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