[PATCH] D53201: [DAGCombiner] reduce insert+bitcast+extract vector ops to truncate (PR39016)

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


================
Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:15526
+      unsigned VecEltBitWidth = VT.getScalarSizeInBits();
+      BCTruncElt = IsLE ? 0 : XBitWidth / VecEltBitWidth - 1;
+
----------------
Does this work correctly on big endian for non power of 2 element count or element size such that XBitWidth isn't evenly divisible by VecEltBitWidth.


https://reviews.llvm.org/D53201