Revision aa95e3a5 tcg/README

b/tcg/README
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* Helpers:
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Using the tcg_gen_helper_x_y it is possible to call any function
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taking i32, i64 or pointer types. By default, before calling an helper,
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taking i32, i64 or pointer types. By default, before calling a helper,
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all globals are stored at their canonical location and it is assumed
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that the function can modify them. This can be overriden by the
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that the function can modify them. This can be overridden by the
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TCG_CALL_CONST function modifier. By default, the helper is allowed to
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modify the CPU state or raise an exception. This can be overriden by
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modify the CPU state or raise an exception. This can be overridden by
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the TCG_CALL_PURE function modifier, in which case the call to the
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function is removed if the return value is not used.
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......
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  the speed of the translation.
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- Don't hesitate to use helpers for complicated or seldom used target
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  intructions. There is little performance advantage in using TCG to
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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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