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Xavier Leroy authored
A bitfield assignment `x.b = f()` is expanded into a read-modify-write on `x.carrier`. Wrong results can occur if `x.carrier` is read before the call to `f()`, and `f` itself modifies a bitfield with the same carrier `x.carrier`. In this temporary fix, we play on the evaluation order implemented by the SimplExpr pass of CompCert (left-to-right for side-effecting subexpression) to make sure the read part of the read-modify-write sequence occurs after the evaluation of the right-hand side. More substantial fixes will be considered later. Fixes: #395
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