[llvm] LV: Expand llvm.histogram intrinsic to support umax, umin, and uadd.sat operations (PR #127399)

[via llvm-commits]

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@@ -2187,7 +2188,14 @@ class VPHistogramRecipe : public VPRecipeBase, public VPIRMetadata {
   InstructionCost computeCost(ElementCount VF,
                               VPCostContext &Ctx) const override;
 
-  unsigned getOpcode() const { return Opcode; }
+  /// Return the histogram intrinsic ID for this recipe's update kind.
+  Intrinsic::ID getHistogramIntrinsicID() const;
+
+  /// Return true if the increment should be negated before passing to the
+  /// histogram intrinsic (only for Sub).
+  bool mustNegateIncrement() const {
+    return UpdateKind == HistogramUpdateKind::Sub;
+  }
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RonDahan101 wrote:

Done

https://github.com/llvm/llvm-project/pull/127399