================
@@ -57860,6 +57873,17 @@ static SDValue combineAndnp(SDNode *N, SelectionDAG
&DAG,
std::tie(Bits0, Elts0) = GetDemandedMasks(N1);
std::tie(Bits1, Elts1) = GetDemandedMasks(N0, true);
+ // Reuse a live arithmetic shift when only sign bits are needed. This keeps
+ // the two-address SSE shift from requiring a copy of its input for ANDNP.
+ if (!Subtarget.hasAVX() && Bits0.isSignMask() &&
----------------
RKSimon wrote:
I don't like this at all - plus I'm hoping to remove a lot of this
GetDemandedMasks code soon as its not POISON safe.
https://github.com/llvm/llvm-project/pull/230770
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