[X86] Don't produce bad x86andp nodes for i1 vectors

In D85499, I attempted to fix this same issue by canonicalizing
andnp for i1 vectors, but since there was some opposition to such
a change, this commit just fixes the bug by using two different
forms depending on which kind of vector type is in use. We can
then always decide to switch the canonical forms later.

Description of the original bug:
We have a DAG combine that tries to fold (vselect cond, 0000..., X) -> (andnp cond, x).
However, it does so by attempting to create an i64 vector with the number
of elements obtained by truncating division by 64 from the bitwidth. This is
bad for mask vectors like v8i1, since that division is just zero. Besides,
we don't want i64 vectors anyway. For i1 vectors, switch the pattern
to (andnp (not cond), x), which is the canonical form for `kandn`
on mask registers.

Fixes JuliaLang/julia#36955.

Differential Revision: https://reviews.llvm.org/D85553

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -39633,10 +39633,14 @@ combineVSelectWithAllOnesOrZeros(SDNode *N, SelectionDAG &DAG,
 
   // vselect Cond, 000..., X -> andn Cond, X
   if (TValIsAllZeros) {
-    MVT AndNVT = MVT::getVectorVT(MVT::i64, CondVT.getSizeInBits() / 64);
-    SDValue CastCond = DAG.getBitcast(AndNVT, Cond);
-    SDValue CastRHS = DAG.getBitcast(AndNVT, RHS);
-    SDValue AndN = DAG.getNode(X86ISD::ANDNP, DL, AndNVT, CastCond, CastRHS);
+    SDValue CastRHS = DAG.getBitcast(CondVT, RHS);
+    SDValue AndN;
+    // The canonical form differs for i1 vectors - x86andnp is not used
+    if (CondVT.getScalarType() == MVT::i1)
+      AndN = DAG.getNode(ISD::AND, DL, CondVT, DAG.getNOT(DL, Cond, CondVT),
+                         CastRHS);
+    else
+      AndN = DAG.getNode(X86ISD::ANDNP, DL, CondVT, Cond, CastRHS);
     return DAG.getBitcast(VT, AndN);
   }
 

llvm/test/CodeGen/X86/avx512-select.ll

@@ -705,3 +705,64 @@ define void @select_v1i1(<1 x i1>* %w, <1 x i1>* %x, <1 x i1>* %y, i1 %z) nounwi
   store <1 x i1> %c, <1 x i1>* %x
   ret void
 }
+
+; Regression test from https://github.com/JuliaLang/julia/issues/36955
+define i8 @julia_issue36955(<8 x i1> %mask, <8 x double> %a) {
+; X86-AVX512F-LABEL: julia_issue36955:
+; X86-AVX512F:       # %bb.0:
+; X86-AVX512F-NEXT:    vpmovsxwq %xmm0, %zmm0
+; X86-AVX512F-NEXT:    vpsllq $63, %zmm0, %zmm0
+; X86-AVX512F-NEXT:    vxorpd %xmm2, %xmm2, %xmm2
+; X86-AVX512F-NEXT:    vcmplepd %zmm2, %zmm1, %k1
+; X86-AVX512F-NEXT:    vptestmq %zmm0, %zmm0, %k0 {%k1}
+; X86-AVX512F-NEXT:    korw %k0, %k1, %k0
+; X86-AVX512F-NEXT:    kmovw %k0, %eax
+; X86-AVX512F-NEXT:    # kill: def $al killed $al killed $eax
+; X86-AVX512F-NEXT:    vzeroupper
+; X86-AVX512F-NEXT:    retl
+;
+; X64-AVX512F-LABEL: julia_issue36955:
+; X64-AVX512F:       # %bb.0:
+; X64-AVX512F-NEXT:    vpmovsxwq %xmm0, %zmm0
+; X64-AVX512F-NEXT:    vpsllq $63, %zmm0, %zmm0
+; X64-AVX512F-NEXT:    vxorpd %xmm2, %xmm2, %xmm2
+; X64-AVX512F-NEXT:    vcmplepd %zmm2, %zmm1, %k1
+; X64-AVX512F-NEXT:    vptestmq %zmm0, %zmm0, %k0 {%k1}
+; X64-AVX512F-NEXT:    korw %k0, %k1, %k0
+; X64-AVX512F-NEXT:    kmovw %k0, %eax
+; X64-AVX512F-NEXT:    # kill: def $al killed $al killed $eax
+; X64-AVX512F-NEXT:    vzeroupper
+; X64-AVX512F-NEXT:    retq
+;
+; X86-AVX512BW-LABEL: julia_issue36955:
+; X86-AVX512BW:       # %bb.0:
+; X86-AVX512BW-NEXT:    vpsllw $15, %xmm0, %xmm0
+; X86-AVX512BW-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; X86-AVX512BW-NEXT:    vxorpd %xmm3, %xmm3, %xmm3
+; X86-AVX512BW-NEXT:    vcmplepd %zmm3, %zmm1, %k1
+; X86-AVX512BW-NEXT:    vpcmpgtw %zmm0, %zmm2, %k0 {%k1}
+; X86-AVX512BW-NEXT:    korw %k0, %k1, %k0
+; X86-AVX512BW-NEXT:    kmovd %k0, %eax
+; X86-AVX512BW-NEXT:    # kill: def $al killed $al killed $eax
+; X86-AVX512BW-NEXT:    vzeroupper
+; X86-AVX512BW-NEXT:    retl
+;
+; X64-AVX512BW-LABEL: julia_issue36955:
+; X64-AVX512BW:       # %bb.0:
+; X64-AVX512BW-NEXT:    vpsllw $15, %xmm0, %xmm0
+; X64-AVX512BW-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; X64-AVX512BW-NEXT:    vxorpd %xmm3, %xmm3, %xmm3
+; X64-AVX512BW-NEXT:    vcmplepd %zmm3, %zmm1, %k1
+; X64-AVX512BW-NEXT:    vpcmpgtw %zmm0, %zmm2, %k0 {%k1}
+; X64-AVX512BW-NEXT:    korw %k0, %k1, %k0
+; X64-AVX512BW-NEXT:    kmovd %k0, %eax
+; X64-AVX512BW-NEXT:    # kill: def $al killed $al killed $eax
+; X64-AVX512BW-NEXT:    vzeroupper
+; X64-AVX512BW-NEXT:    retq
+  %fcmp = fcmp ugt <8 x double> %a, zeroinitializer
+  %xor = xor <8 x i1> %fcmp, <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>
+  %select1 = select <8 x i1> %fcmp, <8 x i1> zeroinitializer, <8 x i1> %mask
+  %select2 = select <8 x i1> %xor, <8 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <8 x i1> %select1
+  %ret = bitcast <8 x i1> %select2 to i8
+  ret i8 %ret
+}