[Mlir-commits] [mlir] Introduce `arith.scaling_extf` and `arith.scaling_truncf` (PR #141965)

[Krzysztof Drewniak]

================
@@ -409,6 +410,80 @@ struct F8E8M0TruncFOpConverter : public OpRewritePattern<arith::TruncFOp> {
   }
 };
 
+struct ScalingExtFOpConverter : public OpRewritePattern<arith::ScalingExtFOp> {
+  using OpRewritePattern::OpRewritePattern;
+  LogicalResult matchAndRewrite(arith::ScalingExtFOp op,
+                                PatternRewriter &rewriter) const final {
+    ImplicitLocOpBuilder b(op.getLoc(), rewriter);
+    Value inputOperand = op.getIn();
+    Value scaleOperand = op.getScale();
+    Type scaleETy = getElementTypeOrSelf(scaleOperand);
+    // allow implicit exponent extraction from 16/32 bits floats
+    if (scaleETy.getIntOrFloatBitWidth() >= 16) {
+      scaleETy = b.getF8E8M0Type();
+      scaleOperand = b.create<arith::TruncFOp>(scaleETy, scaleOperand, nullptr,
----------------
krzysz00 wrote:

That is, can you add a test for `arith.scaling_truncf %0, %1 : vector<4xf32>, vector<4xf32> into vector<4xf4E2M1FNU>` and similar for `arith.scaling_extf`?

https://github.com/llvm/llvm-project/pull/141965