[PATCH] D79215: [llvm][NFC] Inliner: simplify inlining decision logic

[Mircea Trofin via Phabricator via llvm-commits]

mtrofin marked an inline comment as done.
mtrofin added inline comments.


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Comment at: llvm/lib/Transforms/IPO/Inliner.cpp:457
+    setInlineRemark(CB, inlineCostStr(IC));
+    return None;
   }
----------------
davidxl wrote:
> mtrofin wrote:
> > mtrofin wrote:
> > > mtrofin wrote:
> > > > davidxl wrote:
> > > > > Returning None simplifies the check of the return value a little, but it drops information. Perhaps just return IC in case the user needs to check it in different context?
> > > > That's the thing, the user doesn't use the IC in the 'don't inline' case.
> > > Or you mean return InlineCost, not Optional<InlineCost> - and fabricate a 'never' if needed?
> > Actually, looking at it, returning InlineCost (not Optional) won't work, we would equally lose information in the deferred case. I could wrap shouldInline, if we expect other users of it (but seems unnecessarily complex?)
> I meant return Optional<InlineCost> -- basically does not change the behavior of shouldInline(..) in terms of what is returned. It is not super important -- just feels like the info is computed, used in place and dropped before returning seems unnecessary.
The info isn't dropped if the call is inlinable though. Just if it's not - in which case we consume all we need there.


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https://reviews.llvm.org/D79215