[mips32][wasm-simd] Support returning Simd128 on caller's stack

Port: 360c9294

Change-Id: I9a0d0dd3d70ad6dd5aa94aa2d8f200111a9f5c3d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2570828Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#71588}

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

@@ -1677,17 +1677,18 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       }
       break;
     case kMipsPeek: {
-      // The incoming value is 0-based, but we need a 1-based value.
-      int reverse_slot = i.InputInt32(0) + 1;
+      int reverse_slot = i.InputInt32(0);
       int offset =
           FrameSlotToFPOffset(frame()->GetTotalFrameSlotCount() - reverse_slot);
       if (instr->OutputAt(0)->IsFPRegister()) {
         LocationOperand* op = LocationOperand::cast(instr->OutputAt(0));
         if (op->representation() == MachineRepresentation::kFloat64) {
           __ Ldc1(i.OutputDoubleRegister(), MemOperand(fp, offset));
-        } else {
-          DCHECK_EQ(op->representation(), MachineRepresentation::kFloat32);
+        } else if (op->representation() == MachineRepresentation::kFloat32) {
           __ lwc1(i.OutputSingleRegister(0), MemOperand(fp, offset));
+        } else {
+          DCHECK_EQ(op->representation(), MachineRepresentation::kSimd128);
+          __ ld_b(i.OutputSimd128Register(), MemOperand(fp, offset));
         }
       } else {
         __ lw(i.OutputRegister(0), MemOperand(fp, offset));

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

@@ -1382,6 +1382,8 @@ void InstructionSelector::EmitPrepareResults(
         MarkAsFloat32(output.node);
       } else if (output.location.GetType() == MachineType::Float64()) {
         MarkAsFloat64(output.node);
+      } else if (output.location.GetType() == MachineType::Simd128()) {
+        MarkAsSimd128(output.node);
       }
       int offset = call_descriptor->GetOffsetToReturns();
       int reverse_slot = -output.location.GetLocation() - offset;