[X86] Remove extract_subvector(subv_broadcast_load()) fold.

This was needed in an earlier version of D92645, but isn't now - and I've just noticed that it was potentially flawed depending on the relevant widths of the broadcasted and extracted subvectors.

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 5264014..20a75cb 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -49390,8 +49390,7 @@ static SDValue combineExtractSubvector(SDNode *N, SelectionDAG &DAG,
   // extract the lowest subvector instead which should allow
   // SimplifyDemandedVectorElts do more simplifications.
   if (IdxVal != 0 && (InVec.getOpcode() == X86ISD::VBROADCAST ||
-                      InVec.getOpcode() == X86ISD::VBROADCAST_LOAD ||
-                      InVec.getOpcode() == X86ISD::SUBV_BROADCAST_LOAD))
+                      InVec.getOpcode() == X86ISD::VBROADCAST_LOAD))
     return extractSubVector(InVec, 0, DAG, SDLoc(N), SizeInBits);
 
   // If we're extracting a broadcasted subvector, just use the source.