[llvm] [AArch64] Replace AND with LSL#2 for LDR target (#34101) (PR #89531)

[Justin Fargnoli via llvm-commits]

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@@ -9893,7 +9894,8 @@ SDValue DAGCombiner::visitSHL(SDNode *N) {
     // folding this will increase the total number of instructions.
     if (N0.getOpcode() == ISD::SRL &&
         (N0.getOperand(1) == N1 || N0.hasOneUse()) &&
-        TLI.shouldFoldConstantShiftPairToMask(N, Level)) {
+        TLI.shouldFoldConstantShiftPairToMask(N, Level) &&
+        !isCanBeLoadedWithLsl(N)) {
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justinfargnoli wrote:

Why not move the call to `isCanBeLoadedWithLsl()` outside of `SelectionDAG` and into the `aarch64` target? 

https://github.com/llvm/llvm-project/pull/89531