================
@@ -33190,6 +33190,12 @@ static SDValue LowerBITREVERSE(SDValue Op, const
X86Subtarget &Subtarget,
unsigned NumElts = VT.getVectorNumElements();
+ // If we have BMM, we can use VPBITREVB to reverse the bits in each byte.
+ // BMM implies VLX support, so this works for 128/256/512-bit vectors.
+ if (Subtarget.hasBMM() && VT.getSizeInBits() >= 128) {
+ return DAG.getNode(X86ISD::VPBITREVB, DL, VT, In);
----------------
ganeshgit wrote:
Yes will do it. Will split the patch into two.
1. For znver6 skeleton enablement
2. BMM removing BITREVB and using the generics.
https://github.com/llvm/llvm-project/pull/179150
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