[mlir] Fix -Wunused-result in ElementwiseOpFusion.cpp (NFC)

DamonFool · DamonFool · commit d8b6df2e8b1d · 2024-08-21T09:04:24.000+08:00
/llvm-project/mlir/lib/Dialect/Linalg/Transforms/ElementwiseOpFusion.cpp:124:7:
error: ignoring return value of function declared with 'nodiscard' attribute [-Werror,-Wunused-result]
      opOperandsToIgnore.pop_back_val();
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
diff --git a/mlir/lib/Dialect/Linalg/Transforms/ElementwiseOpFusion.cpp b/mlir/lib/Dialect/Linalg/Transforms/ElementwiseOpFusion.cpp
@@ -121,7 +121,7 @@ llvm::SmallDenseSet<int> mlir::linalg::getPreservedProducerResults(
       preservedProducerResults.insert(producerResult.index());
 
       // In case the operand can't be dropped
-      opOperandsToIgnore.pop_back_val();
+      (void)opOperandsToIgnore.pop_back_val();
     }
   }
   return preservedProducerResults;

Original file line number	Diff line number	Diff line change
`@@ -121,7 +121,7 @@ llvm::SmallDenseSet<int> mlir::linalg::getPreservedProducerResults(`
`121`	`121`	`preservedProducerResults.insert(producerResult.index());`
`122`	`122`
`123`	`123`	`// In case the operand can't be dropped`
`124`		`- opOperandsToIgnore.pop_back_val();`
	`124`	`+ (void)opOperandsToIgnore.pop_back_val();`
`125`	`125`	`}`
`126`	`126`	`}`
`127`	`127`	`return preservedProducerResults;`