[llvm] [LLVM] Add `llvm.masked.compress` intrinsic (PR #92289)

[Craig Topper via llvm-commits]

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@@ -2335,6 +2347,19 @@ SDValue DAGTypeLegalizer::PromoteIntOp_MSCATTER(MaskedScatterSDNode *N,
                               N->getIndexType(), TruncateStore);
 }
 
+SDValue DAGTypeLegalizer::PromoteIntOp_MCOMPRESS(SDNode *N, unsigned OpNo) {
+  SDValue Vec = N->getOperand(0);
+  SDValue Mask = N->getOperand(1);
+  EVT VT = Vec.getValueType();
+
+  if (OpNo == 0)
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topperc wrote:

Because the result type and first operand type match, this will never be called with OpNo == 0.

https://github.com/llvm/llvm-project/pull/92289