[llvm] [RISCV][ISel] Add codegen support for the experimental zabha extension (PR #80192)

[James Y Knight via llvm-commits]

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@@ -19627,6 +19635,8 @@ Value *RISCVTargetLowering::emitMaskedAtomicRMWIntrinsic(
         Builder.CreateCall(LrwOpScwLoop, {AlignedAddr, Incr, Mask, Ordering});
   }
 
+  if (Subtarget.hasStdExtZabha())
+    return Builder.CreateTrunc(Result, AI->getValOperand()->getType());
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jyknight wrote:

This can go away with fix to setMinCmpXchgSizeInBits, I think.

https://github.com/llvm/llvm-project/pull/80192