[PATCH] D99439: Update @llvm.powi to handle different int sizes for the exponent

[Eli Friedman via Phabricator via cfe-commits]

efriedma added a comment.

Seems reasonable.  I'd like to see a test for autoupgrade; not sure if you need to make any code changes for that.



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Comment at: llvm/docs/LangRef.rst:13282
+to one of the ``__powi*`` functions in compiler-rt. Not all targets support
 all types however.
 
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Maybe make this a bit more explicit: move the description of the exponent into a separate paragraph, and explicitly state "generally, the only exponent supported is the C type `int`".


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Comment at: llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp:581
                                    RTLIB::POWI_F128,
                                    RTLIB::POWI_PPCF128);
   if (!TLI.getLibcallName(LC)) {
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This is missing a diagnostic for the exponent.  We don't want to silently miscompile if someone uses an exponent that isn't supported by the target.


Repository:
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https://reviews.llvm.org/D99439