[wasm-simd][liftoff][arm][arm64] Implement i32x4_dot_i16x8_s

Bug: v8:10993
Change-Id: Id767016fe0ecc3357a5f5c106b82e0c1e52b9209
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2477734
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70585}

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

@@ -2924,7 +2924,18 @@ void LiftoffAssembler::emit_i32x4_max_u(LiftoffRegister dst,
 void LiftoffAssembler::emit_i32x4_dot_i16x8_s(LiftoffRegister dst,
                                               LiftoffRegister lhs,
                                               LiftoffRegister rhs) {
-  bailout(kSimd, "i32x4_dot_i16x8_s");
+  QwNeonRegister dest = liftoff::GetSimd128Register(dst);
+  QwNeonRegister left = liftoff::GetSimd128Register(lhs);
+  QwNeonRegister right = liftoff::GetSimd128Register(rhs);
+
+  UseScratchRegisterScope temps(this);
+  Simd128Register scratch = temps.AcquireQ();
+
+  vmull(NeonS16, scratch, left.low(), right.low());
+  vpadd(Neon32, dest.low(), scratch.low(), scratch.high());
+
+  vmull(NeonS16, scratch, left.high(), right.high());
+  vpadd(Neon32, dest.high(), scratch.low(), scratch.high());
 }
 
 void LiftoffAssembler::emit_i16x8_splat(LiftoffRegister dst,

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

@@ -2006,7 +2006,12 @@ void LiftoffAssembler::emit_i32x4_max_u(LiftoffRegister dst,
 void LiftoffAssembler::emit_i32x4_dot_i16x8_s(LiftoffRegister dst,
                                               LiftoffRegister lhs,
                                               LiftoffRegister rhs) {
-  bailout(kSimd, "i32x4_dot_i16x8_s");
+  UseScratchRegisterScope scope(this);
+  VRegister tmp1 = scope.AcquireV(kFormat4S);
+  VRegister tmp2 = scope.AcquireV(kFormat4S);
+  Smull(tmp1, lhs.fp().V4H(), rhs.fp().V4H());
+  Smull2(tmp2, lhs.fp().V8H(), rhs.fp().V8H());
+  Addp(dst.fp().V4S(), tmp1, tmp2);
 }
 
 void LiftoffAssembler::emit_i16x8_splat(LiftoffRegister dst,