[WebAssembly] Implement i64x2 comparisons (#98)

alexcrichton · tlively · nikic · commit c64b1fb2820d · 2021-07-10T10:17:20.000+02:00
Removes the prototype builtin and intrinsic for i64x2.eq and implements that instruction as well as the other i64x2 comparison instructions in the final SIMD spec. Unsigned comparisons were not included in the final spec, so they still need to be scalarized via a custom lowering. Differential Revision: https://reviews.llvm.org/D99623 Co-authored-by: Thomas Lively <tlively@google.com>
diff --git a/clang/include/clang/Basic/BuiltinsWebAssembly.def b/clang/include/clang/Basic/BuiltinsWebAssembly.def
@@ -215,7 +215,5 @@ TARGET_BUILTIN(__builtin_wasm_store16_lane, "vs*V8sIi", "n", "simd128")
 TARGET_BUILTIN(__builtin_wasm_store32_lane, "vi*V4iIi", "n", "simd128")
 TARGET_BUILTIN(__builtin_wasm_store64_lane, "vLLi*V2LLiIi", "n", "simd128")
 
-TARGET_BUILTIN(__builtin_wasm_eq_i64x2, "V2LLiV2LLiV2LLi", "nc", "simd128")
-
 #undef BUILTIN
 #undef TARGET_BUILTIN
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -17085,12 +17085,6 @@ Value *CodeGenFunction::EmitWebAssemblyBuiltinExpr(unsigned BuiltinID,
     Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_popcnt);
     return Builder.CreateCall(Callee, {Vec});
   }
-  case WebAssembly::BI__builtin_wasm_eq_i64x2: {
-    Value *LHS = EmitScalarExpr(E->getArg(0));
-    Value *RHS = EmitScalarExpr(E->getArg(1));
-    Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_eq);
-    return Builder.CreateCall(Callee, {LHS, RHS});
-  }
   case WebAssembly::BI__builtin_wasm_any_true_i8x16:
   case WebAssembly::BI__builtin_wasm_any_true_i16x8:
   case WebAssembly::BI__builtin_wasm_any_true_i32x4:
diff --git a/clang/test/CodeGen/builtins-wasm.c b/clang/test/CodeGen/builtins-wasm.c
@@ -650,12 +650,6 @@ i8x16 popcnt(i8x16 x) {
   // WEBASSEMBLY-NEXT: ret
 }
 
-i64x2 eq_i64x2(i64x2 x, i64x2 y) {
-  return __builtin_wasm_eq_i64x2(x, y);
-  // WEBASSEMBLY: call <2 x i64> @llvm.wasm.eq(<2 x i64> %x, <2 x i64> %y)
-  // WEBASSEMBLY-NEXT: ret
-}
-
 int any_true_i8x16(i8x16 x) {
   return __builtin_wasm_any_true_i8x16(x);
   // WEBASSEMBLY: call i32 @llvm.wasm.anytrue.v16i8(<16 x i8> %x)
diff --git a/llvm/include/llvm/IR/IntrinsicsWebAssembly.td b/llvm/include/llvm/IR/IntrinsicsWebAssembly.td
@@ -294,13 +294,6 @@ def int_wasm_extadd_pairwise_unsigned :
             [LLVMSubdivide2VectorType<0>],
             [IntrNoMem, IntrSpeculatable]>;
 
-// TODO: Remove this intrinsic and the associated builtin if i64x2.eq gets
-// merged to the proposal.
-def int_wasm_eq :
-  Intrinsic<[llvm_v2i64_ty],
-            [llvm_v2i64_ty, llvm_v2i64_ty],
-            [IntrNoMem, IntrSpeculatable]>;
-
 // TODO: Remove these if possible if they are merged to the spec.
 def int_wasm_convert_low_signed :
   Intrinsic<[llvm_v2f64_ty], [llvm_v4i32_ty],
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -186,9 +186,9 @@ WebAssemblyTargetLowering::WebAssemblyTargetLowering(
       for (auto T : {MVT::v4f32, MVT::v2f64})
         setOperationAction(Op, T, Expand);
 
-    // Expand operations not supported for i64x2 vectors
-    for (unsigned CC = 0; CC < ISD::SETCC_INVALID; ++CC)
-      setCondCodeAction(static_cast<ISD::CondCode>(CC), MVT::v2i64, Custom);
+    // Unsigned comparison operations are unavailable for i64x2 vectors.
+    for (auto CC : {ISD::SETUGT, ISD::SETUGE, ISD::SETULT, ISD::SETULE})
+      setCondCodeAction(CC, MVT::v2i64, Custom);
 
     // 64x2 conversions are not in the spec
     for (auto Op :
@@ -1775,11 +1775,8 @@ WebAssemblyTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
 SDValue WebAssemblyTargetLowering::LowerSETCC(SDValue Op,
                                               SelectionDAG &DAG) const {
   SDLoc DL(Op);
-  // The legalizer does not know how to expand the comparison modes of i64x2
-  // vectors because no comparison modes are supported. We could solve this by
-  // expanding all i64x2 SETCC nodes, but that seems to expand f64x2 SETCC nodes
-  // (which return i64x2 results) as well. So instead we manually unroll i64x2
-  // comparisons here.
+  // The legalizer does not know how to expand the unsupported comparison modes
+  // of i64x2 vectors, so we manually unroll them here.
   assert(Op->getOperand(0)->getSimpleValueType(0) == MVT::v2i64);
   SmallVector<SDValue, 2> LHS, RHS;
   DAG.ExtractVectorElements(Op->getOperand(0), LHS);
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
@@ -650,32 +650,38 @@ multiclass SIMDConditionFP<string name, CondCode cond, bits<32> baseInst> {
 // Equality: eq
 let isCommutable = 1 in {
 defm EQ : SIMDConditionInt<"eq", SETEQ, 35>;
+defm EQ : SIMDCondition<I64x2, "eq", SETEQ, 214>;
 defm EQ : SIMDConditionFP<"eq", SETOEQ, 65>;
 } // isCommutable = 1
 
 // Non-equality: ne
 let isCommutable = 1 in {
 defm NE : SIMDConditionInt<"ne", SETNE, 36>;
+defm NE : SIMDCondition<I64x2, "ne", SETNE, 215>;
 defm NE : SIMDConditionFP<"ne", SETUNE, 66>;
 } // isCommutable = 1
 
 // Less than: lt_s / lt_u / lt
 defm LT_S : SIMDConditionInt<"lt_s", SETLT, 37>;
+defm LT_S : SIMDCondition<I64x2, "lt_s", SETLT, 216>;
 defm LT_U : SIMDConditionInt<"lt_u", SETULT, 38>;
 defm LT : SIMDConditionFP<"lt", SETOLT, 67>;
 
 // Greater than: gt_s / gt_u / gt
 defm GT_S : SIMDConditionInt<"gt_s", SETGT, 39>;
+defm GT_S : SIMDCondition<I64x2, "gt_s", SETGT, 217>;
 defm GT_U : SIMDConditionInt<"gt_u", SETUGT, 40>;
 defm GT : SIMDConditionFP<"gt", SETOGT, 68>;
 
 // Less than or equal: le_s / le_u / le
 defm LE_S : SIMDConditionInt<"le_s", SETLE, 41>;
+defm LE_S : SIMDCondition<I64x2, "le_s", SETLE, 218>;
 defm LE_U : SIMDConditionInt<"le_u", SETULE, 42>;
 defm LE : SIMDConditionFP<"le", SETOLE, 69>;
 
 // Greater than or equal: ge_s / ge_u / ge
 defm GE_S : SIMDConditionInt<"ge_s", SETGE, 43>;
+defm GE_S : SIMDCondition<I64x2, "ge_s", SETGE, 219>;
 defm GE_U : SIMDConditionInt<"ge_u", SETUGE, 44>;
 defm GE : SIMDConditionFP<"ge", SETOGE, 70>;
 
@@ -692,14 +698,6 @@ foreach nodes = [[seteq, EQ_F64x2], [setne, NE_F64x2], [setlt, LT_F64x2],
 def : Pat<(v2i64 (nodes[0] (v2f64 V128:$lhs), (v2f64 V128:$rhs))),
           (nodes[1] $lhs, $rhs)>;
 
-// Prototype i64x2.eq
-defm EQ_v2i64 :
-  SIMD_I<(outs V128:$dst), (ins V128:$lhs, V128:$rhs), (outs), (ins),
-         [(set (v2i64 V128:$dst),
-           (int_wasm_eq (v2i64 V128:$lhs), (v2i64 V128:$rhs)))],
-         "i64x2.eq\t$dst, $lhs, $rhs", "i64x2.eq", 192>;
-
-
 //===----------------------------------------------------------------------===//
 // Bitwise operations
 //===----------------------------------------------------------------------===//
diff --git a/llvm/test/CodeGen/WebAssembly/simd-comparisons.ll b/llvm/test/CodeGen/WebAssembly/simd-comparisons.ll
@@ -637,44 +637,62 @@ define <4 x i32> @compare_sext_uge_v4i32 (<4 x i32> %x, <4 x i32> %y) {
 }
 
 ; CHECK-LABEL: compare_eq_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_eq_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.eq $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i1> @compare_eq_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp eq <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_eq_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sext_eq_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.eq $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i64> @compare_sext_eq_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp eq <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
   ret <2 x i64> %res
 }
 
 ; CHECK-LABEL: compare_ne_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_ne_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.ne $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i1> @compare_ne_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp ne <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_ne_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sext_ne_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.ne $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i64> @compare_sext_ne_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp ne <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
   ret <2 x i64> %res
 }
 
 ; CHECK-LABEL: compare_slt_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_slt_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.lt_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i1> @compare_slt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp slt <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_slt_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sext_slt_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.lt_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i64> @compare_sext_slt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp slt <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
@@ -683,28 +701,36 @@ define <2 x i64> @compare_sext_slt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
 
 ; CHECK-LABEL: compare_ult_v2i64:
 ; SIMD128-NEXT: .functype compare_ult_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.lt_u
 define <2 x i1> @compare_ult_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp ult <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_ult_v2i64:
 ; SIMD128-NEXT: .functype compare_sext_ult_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.lt_u
 define <2 x i64> @compare_sext_ult_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp ult <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
   ret <2 x i64> %res
 }
 
 ; CHECK-LABEL: compare_sle_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sle_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.le_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i1> @compare_sle_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp sle <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_sle_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sext_sle_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.le_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i64> @compare_sext_sle_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp sle <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
@@ -713,28 +739,36 @@ define <2 x i64> @compare_sext_sle_v2i64 (<2 x i64> %x, <2 x i64> %y) {
 
 ; CHECK-LABEL: compare_ule_v2i64:
 ; SIMD128-NEXT: .functype compare_ule_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.le_u
 define <2 x i1> @compare_ule_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp ule <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_ule_v2i64:
 ; SIMD128-NEXT: .functype compare_sext_ule_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.le_u
 define <2 x i64> @compare_sext_ule_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp ule <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
   ret <2 x i64> %res
 }
 
 ; CHECK-LABEL: compare_sgt_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sgt_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.gt_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i1> @compare_sgt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp sgt <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_sgt_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sext_sgt_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.gt_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i64> @compare_sext_sgt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp sgt <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
@@ -743,28 +777,36 @@ define <2 x i64> @compare_sext_sgt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
 
 ; CHECK-LABEL: compare_ugt_v2i64:
 ; SIMD128-NEXT: .functype compare_ugt_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.gt_u
 define <2 x i1> @compare_ugt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp ugt <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_ugt_v2i64:
 ; SIMD128-NEXT: .functype compare_sext_ugt_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.gt_u
 define <2 x i64> @compare_sext_ugt_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp ugt <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
   ret <2 x i64> %res
 }
 
 ; CHECK-LABEL: compare_sge_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sge_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.ge_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i1> @compare_sge_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp sge <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_sge_v2i64:
+; NO-SIMD128-NOT: i64x2
 ; SIMD128-NEXT: .functype compare_sext_sge_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128-NEXT: i64x2.ge_s $push[[R:[0-9]+]]=, $0, $1{{$}}
+; SIMD128-NEXT: return $pop[[R]]{{$}}
 define <2 x i64> @compare_sext_sge_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp sge <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
@@ -773,13 +815,15 @@ define <2 x i64> @compare_sext_sge_v2i64 (<2 x i64> %x, <2 x i64> %y) {
 
 ; CHECK-LABEL: compare_uge_v2i64:
 ; SIMD128-NEXT: .functype compare_uge_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.ge_u
 define <2 x i1> @compare_uge_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %res = icmp uge <2 x i64> %x, %y
   ret <2 x i1> %res
 }
 
 ; CHECK-LABEL: compare_sext_uge_v2i64:
 ; SIMD128-NEXT: .functype compare_sext_uge_v2i64 (v128, v128) -> (v128){{$}}
+; SIMD128: i64.ge_u
 define <2 x i64> @compare_sext_uge_v2i64 (<2 x i64> %x, <2 x i64> %y) {
   %cmp = icmp uge <2 x i64> %x, %y
   %res = sext <2 x i1> %cmp to <2 x i64>
diff --git a/llvm/test/CodeGen/WebAssembly/simd-intrinsics.ll b/llvm/test/CodeGen/WebAssembly/simd-intrinsics.ll
@@ -553,16 +553,6 @@ define <4 x i32> @trunc_sat_zero_unsigned_v4i32(<2 x double> %a) {
 ; ==============================================================================
 ; 2 x i64
 ; ==============================================================================
-; CHECK-LABEL: eq_v2i64:
-; CHECK-NEXT: .functype eq_v2i64 (v128, v128) -> (v128){{$}}
-; CHECK-NEXT: i64x2.eq $push[[R:[0-9]+]]=, $0, $1{{$}}
-; CHECK-NEXT: return $pop[[R]]{{$}}
-declare <2 x i64> @llvm.wasm.eq(<2 x i64>, <2 x i64>)
-define <2 x i64> @eq_v2i64(<2 x i64> %x, <2 x i64> %y) {
-  %a = call <2 x i64> @llvm.wasm.eq(<2 x i64> %x, <2 x i64> %y)
-  ret <2 x i64> %a
-}
-
 ; CHECK-LABEL: extend_low_s_v2i64:
 ; CHECK-NEXT: .functype extend_low_s_v2i64 (v128) -> (v128){{$}}
 ; CHECK-NEXT: i64x2.extend_low_i32x4_s $push[[R:[0-9]+]]=, $0{{$}}
diff --git a/llvm/test/CodeGen/WebAssembly/simd-select.ll b/llvm/test/CodeGen/WebAssembly/simd-select.ll
@@ -299,33 +299,17 @@ define <2 x i64> @vselect_v2i64(<2 x i1> %c, <2 x i64> %x, <2 x i64> %y) {
   ret <2 x i64> %res
 }
 
-define <2 x i64> @vselect_cmp_v2i64(<2 x i64> %a, <2 x i64> %b,
+define <2 x i64> @vselect_cmp_v2i64(<2 x i64> %a, <2 x i64> %b, <2 x i64> %x, <2 x i64> %y) {
 ; CHECK-LABEL: vselect_cmp_v2i64:
 ; CHECK:         .functype vselect_cmp_v2i64 (v128, v128, v128, v128) -> (v128)
 ; CHECK-NEXT:  # %bb.0:
 ; CHECK-NEXT:    local.get 2
 ; CHECK-NEXT:    local.get 3
-; CHECK-NEXT:    i64.const -1
-; CHECK-NEXT:    i64.const 0
 ; CHECK-NEXT:    local.get 0
-; CHECK-NEXT:    i64x2.extract_lane 0
 ; CHECK-NEXT:    local.get 1
-; CHECK-NEXT:    i64x2.extract_lane 0
-; CHECK-NEXT:    i64.lt_s
-; CHECK-NEXT:    i64.select
-; CHECK-NEXT:    i64x2.splat
-; CHECK-NEXT:    i64.const -1
-; CHECK-NEXT:    i64.const 0
-; CHECK-NEXT:    local.get 0
-; CHECK-NEXT:    i64x2.extract_lane 1
-; CHECK-NEXT:    local.get 1
-; CHECK-NEXT:    i64x2.extract_lane 1
-; CHECK-NEXT:    i64.lt_s
-; CHECK-NEXT:    i64.select
-; CHECK-NEXT:    i64x2.replace_lane 1
+; CHECK-NEXT:    i64x2.lt_s
 ; CHECK-NEXT:    v128.bitselect
 ; CHECK-NEXT:    # fallthrough-return
-                                    <2 x i64> %x, <2 x i64> %y) {
   %c = icmp slt <2 x i64> %a, %b
   %res = select <2 x i1> %c, <2 x i64> %x, <2 x i64> %y
   ret <2 x i64> %res
diff --git a/llvm/test/MC/WebAssembly/simd-encodings.s b/llvm/test/MC/WebAssembly/simd-encodings.s
