TosaToLinalg: Lower TOSA.Cast via RoundEven

Author: mgehre-amd

mlir/lib/Conversion/TosaToLinalg/TosaToLinalg.cpp

@@ -470,11 +470,6 @@ createLinalgBodyCalculationForElementwiseOp(Operation *op, ValueRange args,
     }
 
     if (arith::FPToSIOp::areCastCompatible(srcTy, dstTy)) {
-      auto zero = rewriter.create<arith::ConstantOp>(
-          loc, rewriter.getF32FloatAttr(0.0f));
-      auto half = rewriter.create<arith::ConstantOp>(
-          loc, rewriter.getF32FloatAttr(0.5f));
-
       auto intMin = rewriter.create<arith::ConstantOp>(
           loc, rewriter.getF32FloatAttr(
                    APInt::getSignedMinValue(dstTy.getIntOrFloatBitWidth())
@@ -485,12 +480,7 @@ createLinalgBodyCalculationForElementwiseOp(Operation *op, ValueRange args,
                    APInt::getSignedMaxValue(dstTy.getIntOrFloatBitWidth())
                        .getSExtValue()));
 
-      auto added = rewriter.create<arith::AddFOp>(loc, args[0], half);
-      auto subbed = rewriter.create<arith::SubFOp>(loc, args[0], half);
-      auto negative = rewriter.create<arith::CmpFOp>(
-          loc, arith::CmpFPredicate::OLT, args[0], zero);
-      auto rounded =
-          rewriter.create<arith::SelectOp>(loc, negative, subbed, added);
+      auto rounded = rewriter.create<math::RoundEvenOp>(loc, args[0]);
 
       auto clamped = clampFloatHelper(loc, rounded, intMin, intMax, rewriter);