[X86] combinePredicateReduction - fold any_of(setcc(x,y,ne)) -> pmovmskb(not(pcmpeqb()))

Improves codegen for v2i64 cases, similar to what we already do for all_of(setcc(x,y,eq))

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -44299,20 +44299,20 @@ static SDValue combinePredicateReduction(SDNode *Extract, SelectionDAG &DAG,
       Movmsk = DAG.getBitcast(MovmskVT, Match);
     } else {
       // For all_of(setcc(x,y,eq)) - use PMOVMSKB(PCMPEQB()).
-      // TODO: any_of(setcc(x,y,ne)) - use PMOVMSKB(NOT(PCMPEQB())).
+      // For any_of(setcc(x,y,ne)) - use PMOVMSKB(NOT(PCMPEQB())).
       if (Match.getOpcode() == ISD::SETCC) {
         ISD::CondCode CC = cast<CondCodeSDNode>(Match.getOperand(2))->get();
-        if (BinOp == ISD::AND && CC == ISD::CondCode::SETEQ) {
+        if ((BinOp == ISD::AND && CC == ISD::CondCode::SETEQ) ||
+            (BinOp == ISD::OR && CC == ISD::CondCode::SETNE)) {
           EVT VecVT = Match.getOperand(0).getValueType();
           EVT VecSVT = VecVT.getScalarType();
           if (VecSVT != MVT::i8 && (VecSVT.getSizeInBits() % 8) == 0) {
             NumElts *= VecSVT.getSizeInBits() / 8;
             EVT CmpVT = EVT::getVectorVT(*DAG.getContext(), MVT::i8, NumElts);
             MatchVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1, NumElts);
-            Match = DAG.getSetCC(DL, MatchVT,
-                                 DAG.getBitcast(CmpVT, Match.getOperand(0)),
-                                 DAG.getBitcast(CmpVT, Match.getOperand(1)),
-                                 ISD::CondCode::SETEQ);
+            Match = DAG.getSetCC(
+                DL, MatchVT, DAG.getBitcast(CmpVT, Match.getOperand(0)),
+                DAG.getBitcast(CmpVT, Match.getOperand(1)), CC);
           }
         }
       }

llvm/test/CodeGen/X86/vector-compare-any_of.ll

@@ -1050,24 +1050,22 @@ define i1 @bool_reduction_v8f32(<8 x float> %x, <8 x float> %y) {
 define i1 @bool_reduction_v2i64(<2 x i64> %x, <2 x i64> %y) {
 ; SSE2-LABEL: bool_reduction_v2i64:
 ; SSE2:       # %bb.0:
-; SSE2-NEXT:    pcmpeqd %xmm1, %xmm0
-; SSE2-NEXT:    pshufd {{.*#+}} xmm1 = xmm0[1,0,3,2]
-; SSE2-NEXT:    pand %xmm0, %xmm1
-; SSE2-NEXT:    movmskpd %xmm1, %eax
-; SSE2-NEXT:    cmpl $3, %eax
+; SSE2-NEXT:    pcmpeqb %xmm1, %xmm0
+; SSE2-NEXT:    pmovmskb %xmm0, %eax
+; SSE2-NEXT:    cmpl $65535, %eax # imm = 0xFFFF
 ; SSE2-NEXT:    setne %al
 ; SSE2-NEXT:    retq
 ;
 ; SSE42-LABEL: bool_reduction_v2i64:
 ; SSE42:       # %bb.0:
-; SSE42-NEXT:    psubq %xmm1, %xmm0
+; SSE42-NEXT:    psubb %xmm1, %xmm0
 ; SSE42-NEXT:    ptest %xmm0, %xmm0
 ; SSE42-NEXT:    setne %al
 ; SSE42-NEXT:    retq
 ;
 ; AVX-LABEL: bool_reduction_v2i64:
 ; AVX:       # %bb.0:
-; AVX-NEXT:    vpsubq %xmm1, %xmm0, %xmm0
+; AVX-NEXT:    vpsubb %xmm1, %xmm0, %xmm0
 ; AVX-NEXT:    vptest %xmm0, %xmm0
 ; AVX-NEXT:    setne %al
 ; AVX-NEXT:    retq