[clang] [llvm] [Inliner] Propagate more attributes to params when inlining (PR #91101)

[via cfe-commits]

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@@ -1427,8 +1429,20 @@ static void AddParamAndFnBasicAttributes(const CallBase &CB,
               ValidExactParamAttrs[ArgNo].getAlignment().valueOrOne())
             AL = AL.removeParamAttribute(Context, I, Attribute::Alignment);
 
+          auto ExistingRange = AL.getParamRange(I);
           AL = AL.addParamAttributes(Context, I, ValidExactParamAttrs[ArgNo]);
 
+          // For range we use the exact intersection.
+          if (ExistingRange.has_value()) {
+            if (auto NewRange = ValidExactParamAttrs[ArgNo].getRange()) {
+              auto CombinedRange = ExistingRange->exactIntersectWith(*NewRange);
+              if (!CombinedRange.has_value())
+                CombinedRange =
+                    ConstantRange::getEmpty(NewRange->getBitWidth());
+              AL = AL.removeParamAttribute(Context, I, Attribute::Range);
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goldsteinn wrote:

> hmm if I have not missed something in the end this will be called
> 
> https://github.com/llvm/llvm-project/blob/3591da9f1ccbd8b19fef4814f96638dbbe9c2b40/llvm/lib/IR/Attributes.cpp#L1782-L1790
> 
> 
> so swap will be called and replace the current value or?

Its from the `Merge` call in `addAttributesAtIndex`.

https://github.com/llvm/llvm-project/pull/91101