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  • mu
  • mu-impl-fast
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  • #27

Closed
Open
Created Jun 01, 2017 by Yi Lin@u4776528Owner

Conditional branch adjustment after trace generation

Currently we are doing this adjustment during instruction selection (target dependent code). It is possible to do this in a cleaner and target indepdent way.

We need another pass to adjust conditional branch after trace generation. Ideally before instruction selection, a conditional branch should always be followed by its false label. The adjustment should follow the rules:

  • any conditional branch followed by its false label stays unchanged
  • for conditional branch followed by its true label, we switch the true and false label, and negate the condition
  • for conditional branch followed by neither label, we invent a new false label, and rewrite the conditional branch so that the new cond branch will be followed by the new false label.
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