S390 [wasm-simd]: Implement i64x2 signed compares

Bug: v8:11415
Change-Id: I0101d88d19e5cad20d5f0fa6926cf0ebd9d000e9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698091
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#72796}

src/compiler/backend/ppc/instruction-selector-ppc.cc

@@ -2522,6 +2522,8 @@ void InstructionSelector::VisitI32x4TruncSatF64x2SZero(Node* node) {
 void InstructionSelector::VisitI32x4TruncSatF64x2UZero(Node* node) {
   UNIMPLEMENTED();
 }
+void InstructionSelector::VisitI64x2GtS(Node* node) { UNIMPLEMENTED(); }
+void InstructionSelector::VisitI64x2GeS(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::EmitPrepareResults(
     ZoneVector<PushParameter>* results, const CallDescriptor* call_descriptor,

src/compiler/backend/s390/code-generator-s390.cc

@@ -3187,6 +3187,19 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
                Condition(2));
       break;
     }
+    case kS390_I64x2GtS: {
+      __ vch(i.OutputSimd128Register(), i.InputSimd128Register(0),
+             i.InputSimd128Register(1), Condition(0), Condition(3));
+      break;
+    }
+    case kS390_I64x2GeS: {
+      // Compute !(B > A) which is equal to A >= B.
+      __ vch(kScratchDoubleReg, i.InputSimd128Register(1),
+             i.InputSimd128Register(0), Condition(0), Condition(3));
+      __ vno(i.OutputSimd128Register(), kScratchDoubleReg, kScratchDoubleReg,
+             Condition(0), Condition(0), Condition(3));
+      break;
+    }
     case kS390_I32x4GtS: {
       __ vch(i.OutputSimd128Register(), i.InputSimd128Register(0),
              i.InputSimd128Register(1), Condition(0), Condition(2));

src/compiler/backend/s390/instruction-codes-s390.h

@@ -269,6 +269,8 @@ namespace compiler {
   V(S390_I64x2UConvertI32x4High)            \
   V(S390_I64x2SignSelect)                   \
   V(S390_I64x2Ne)                           \
+  V(S390_I64x2GtS)                          \
+  V(S390_I64x2GeS)                          \
   V(S390_I32x4Splat)                        \
   V(S390_I32x4ExtractLane)                  \
   V(S390_I32x4ReplaceLane)                  \

src/compiler/backend/s390/instruction-scheduler-s390.cc

@@ -216,6 +216,8 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kS390_I64x2UConvertI32x4High:
     case kS390_I64x2SignSelect:
     case kS390_I64x2Ne:
+    case kS390_I64x2GtS:
+    case kS390_I64x2GeS:
     case kS390_I32x4Splat:
     case kS390_I32x4ExtractLane:
     case kS390_I32x4ReplaceLane:

src/compiler/backend/s390/instruction-selector-s390.cc

@@ -2429,6 +2429,8 @@ void InstructionSelector::VisitWord64AtomicStore(Node* node) {
   V(I64x2ExtMulHighI32x4U) \
   V(I16x8Q15MulRSatS)      \
   V(I64x2Ne)               \
+  V(I64x2GtS)              \
+  V(I64x2GeS)              \
   V(I32x4Add)              \
   V(I32x4AddHoriz)         \
   V(I32x4Sub)              \