[PATCH] D84835: [APFloat] Fix incorrect fptrunc rouning when from semantics exp lower than minimal exp of target semantics

[Ulrich Weigand via Phabricator via llvm-commits]

uweigand added a comment.

I'm not sure what specific problem you're trying to solve here, but this change in itself looks incorrect.

The computation done here follows the same logic that would occur later in normalize().  `exponentChange` is (correctly) set to `toSemantics.minExponent - exponent` here so that the subsequent `exponent += exponentChange` will then set `exponent` to `toSemantics.minExponent`.


Repository:
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  https://reviews.llvm.org/D84835/new/

https://reviews.llvm.org/D84835