================
@@ -28909,13 +28909,97 @@ SDValue DAGCombiner::SimplifySelectCC(const SDLoc
&DL, SDValue N0, SDValue N1,
return SDValue();
}
+static SDValue matchMergedBFX(SDValue Root, SelectionDAG &DAG,
+ const TargetLowering &TLI) {
+ // Match a pattern such as:
+ // (X | (X >> C0) | (X >> C1) | ...) & Mask
+ // This extracts contiguous parts of X and ORs them together before
comparing.
+ // We can optimize this so that we directly check (X & SomeMask) instead,
+ // eliminating the shifts.
+
+ EVT VT = Root.getValueType();
----------------
Pierre-vh wrote:
I'll update it. Should I bother supporting vector types here? I think nothing's
stopping it except testing coverage. On AMDGPU we scalarize the vector compares
https://github.com/llvm/llvm-project/pull/146054
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