[Mlir-commits] [mlir] [mlir][AMDGPU] Add scaled floating point conversion ops fp8 (PR #141554)

[Umang Yadav]

================
@@ -139,6 +171,36 @@ def AMDGPU_PackedTrunc2xFp8Op :
   let hasVerifier = 1;
 }
 
+def AMDGPU_PackedScaledTruncOp
+    : AMDGPU_Op<"packed_scaled_trunc", [Pure]>,
+      Arguments<(ins VectorOfLengthAndType<[2], [F32, F16, BF16]>:$source,
+          F32:$scale,
+          ConfinedAttr<I32Attr, [IntNonNegative, IntMaxValue<7>]>:$index,
+          Optional<AnyTypeOf<
+              [FixedVectorOfLengthAndType<[4], [F8E5M2, F8E4M3FN]>,
+               FixedVectorOfLengthAndType<[8], [F4E2M1FN]>]>>:$existing)>,
+      Results<(
+          outs AnyTypeOf<[FixedVectorOfLengthAndType<[4], [F8E5M2, F8E4M3FN]>,
+                          FixedVectorOfLengthAndType<[8], [F4E2M1FN]>]>:$res)> {
+  let summary = "Round two floats into a packed vector of floats";
+  let description = [{
+    Scale and round the inputs `sourceA` and `sourceB` (which is undefined if not
+    specified) into the low or high word (bottom two or top two) elements
----------------
umangyadav wrote:

Is there a selector for selecting low or high word ? 
What's the role of `index` attribute here ? Can you explain  ? 

https://github.com/llvm/llvm-project/pull/141554