[wasm-simd][liftoff][arm][arm64] Implement i64x2.eq

For ARM, factor the code sequence out into a macro-assembler function to
allow sharing between TurboFan and Liftoff.

Bug: v8:11215
Change-Id: Ib337e3f3dd90174b71a9bcd951b3779275c7465c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2648820
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72380}

src/codegen/arm/macro-assembler-arm.cc

@@ -2640,6 +2640,15 @@ void TurboAssembler::I64x2BitMask(Register dst, QwNeonRegister src) {
   add(dst, dst, Operand(tmp, LSL, 1));
 }
 
+void TurboAssembler::I64x2Eq(QwNeonRegister dst, QwNeonRegister src1,
+                             QwNeonRegister src2) {
+  UseScratchRegisterScope temps(this);
+  Simd128Register scratch = temps.AcquireQ();
+  vceq(Neon32, dst, src1, src2);
+  vrev64(Neon32, scratch, dst);
+  vand(dst, dst, scratch);
+}
+
 }  // namespace internal
 }  // namespace v8
 

src/codegen/arm/macro-assembler-arm.h

@@ -569,6 +569,7 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
   // instructions. These helpers allow us to define the optimal code sequence,
   // and be used in both TurboFan and Liftoff.
   void I64x2BitMask(Register dst, QwNeonRegister src);
+  void I64x2Eq(QwNeonRegister dst, QwNeonRegister src1, QwNeonRegister src2);
 
  private:
   // Compare single values and then load the fpscr flags to a register.

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

@@ -2429,13 +2429,8 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     }
     case kArmI64x2Eq: {
-      Simd128Register dst = i.OutputSimd128Register();
-      UseScratchRegisterScope temps(tasm());
-      Simd128Register scratch = temps.AcquireQ();
-      __ vceq(Neon32, dst, i.InputSimd128Register(0),
+      __ I64x2Eq(i.OutputSimd128Register(), i.InputSimd128Register(0),
                  i.InputSimd128Register(1));
-      __ vrev64(Neon32, scratch, dst);
-      __ vand(dst, dst, scratch);
       break;
     }
     case kArmI32x4Eq: {

src/wasm/baseline/arm/liftoff-assembler-arm.h

@@ -3707,7 +3707,8 @@ void LiftoffAssembler::emit_i32x4_ge_u(LiftoffRegister dst, LiftoffRegister lhs,
 
 void LiftoffAssembler::emit_i64x2_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
-  bailout(kSimd, "i64x2.eq");
+  I64x2Eq(liftoff::GetSimd128Register(dst), liftoff::GetSimd128Register(lhs),
+          liftoff::GetSimd128Register(rhs));
 }
 
 void LiftoffAssembler::emit_f32x4_eq(LiftoffRegister dst, LiftoffRegister lhs,

src/wasm/baseline/arm64/liftoff-assembler-arm64.h

@@ -2718,7 +2718,7 @@ void LiftoffAssembler::emit_i32x4_ge_u(LiftoffRegister dst, LiftoffRegister lhs,
 
 void LiftoffAssembler::emit_i64x2_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
-  bailout(kSimd, "i64x2.eq");
+  Cmeq(dst.fp().V2D(), lhs.fp().V2D(), rhs.fp().V2D());
 }
 
 void LiftoffAssembler::emit_f32x4_eq(LiftoffRegister dst, LiftoffRegister lhs,