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@@ -968,21 +968,41 @@ struct BinaryOp {};
                                            fir::FirOpBuilder &builder,         
\
                                            const Op &, hlfir::Entity lhs,      
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                                            hlfir::Entity rhs) {                
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-      return hlfir::EntityWithAttributes{                                      
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-          builder.create<GenBinFirOp>(loc, lhs, rhs)};                         
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+      if constexpr (Fortran::common::TypeCategory::GenBinTyCat ==              
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+                        Fortran::common::TypeCategory::Unsigned &&             
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+                    !std::is_same_v<GenBinFirOp, mlir::arith::DivUIOp>) {      
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+        int bits =                                                             
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+            Fortran::evaluate::Type<Fortran::common::TypeCategory::Integer,    
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+                                    KIND>::Scalar::bits;                       
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+        auto signlessType = mlir::IntegerType::get(                            
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+            builder.getContext(), bits,                                        
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+            mlir::IntegerType::SignednessSemantics::Signless);                 
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+        auto lhsSL = builder.createConvert(loc, signlessType, lhs);            
\
----------------
klausler wrote:

The conversions are gone from the llvm output so at least there aren't no-op 
copies in the generated code.

When/if clang emits mlir, any missing/broken unsigned optimizations will be 
more prominent and likely to get fixed for us.

https://github.com/llvm/llvm-project/pull/113504
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