[IR] Vector extract last active element intrinsic (#113587)
As discussed in #112738, it may be better to have an intrinsic to represent vector element extracts based on mask bits. This intrinsic is for the case of extracting the last active element, if any, or a default value if the mask is all-false.
The target-agnostic SelectionDAG lowering is similar to the IR in #106560.
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index 3f8a3e7..3a8dc25 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -629,6 +629,7 @@
void visitConstrainedFPIntrinsic(const ConstrainedFPIntrinsic &FPI);
void visitConvergenceControl(const CallInst &I, unsigned Intrinsic);
void visitVectorHistogram(const CallInst &I, unsigned IntrinsicID);
+ void visitVectorExtractLastActive(const CallInst &I, unsigned Intrinsic);
void visitVPLoad(const VPIntrinsic &VPIntrin, EVT VT,
const SmallVectorImpl<SDValue> &OpValues);
void visitVPStore(const VPIntrinsic &VPIntrin,
