================
@@ -21095,6 +21095,50 @@ static SDValue foldTruncStoreOfExt(SelectionDAG &DAG,
SDNode *N) {
return SDValue();
}
+// A custom combine to lower load <3 x i8> as the more efficient sequence
+// below:
+// ldrb wX, [x0, #2]
+// ldrh wY, [x0]
+// orr wX, wY, wX, lsl #16
+// fmov s0, wX
+//
+static SDValue combineV3I8LoadExt(LoadSDNode *LD, SelectionDAG &DAG) {
+ EVT MemVT = LD->getMemoryVT();
+ if (MemVT != EVT::getVectorVT(*DAG.getContext(), MVT::i8, 3) ||
+ LD->getOriginalAlign() >= 4)
+ return SDValue();
+
+ SDLoc DL(LD);
+ SDValue Chain = LD->getChain();
+ SDValue BasePtr = LD->getBasePtr();
----------------
inclyc wrote:
> assert to catch the use, if possible.
I think this makes sense because (as per my understanding) usually indexed
loads are created while ISelDAGToDAG phase (right after ISelLowering), so I do
not expect any assertion fails.
https://github.com/llvm/llvm-project/pull/78632
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