[Liftoff] Add f32.load and f32.store support

There is not much missing to support loading and storing f32 values.
This CL adds that.

R=titzer@chromium.org

Bug: v8:6600
Change-Id: If4a21490bfcb9cccec1ba62986a23549b3c857fa
Reviewed-on: https://chromium-review.googlesource.com/866711Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50606}

src/wasm/baseline/ia32/liftoff-assembler-ia32.h

@@ -116,6 +116,9 @@ void LiftoffAssembler::Load(LiftoffRegister dst, Register src_addr,
     case LoadType::kI32Load:
       mov(dst.gp(), src_op);
       break;
+    case LoadType::kF32Load:
+      movss(dst.fp(), src_op);
+      break;
     default:
       UNREACHABLE();
   }
@@ -156,6 +159,9 @@ void LiftoffAssembler::Store(Register dst_addr, Register offset_reg,
     case StoreType::kI32Store:
       mov(dst_op, src.gp());
       break;
+    case StoreType::kF32Store:
+      movss(dst_op, src.fp());
+      break;
     default:
       UNREACHABLE();
   }

src/wasm/baseline/liftoff-compiler.cc

@@ -808,7 +808,8 @@ class LiftoffCompiler {
                const MemoryAccessOperand<validate>& operand,
                const Value& index_val, Value* result) {
     ValueType value_type = type.value_type();
-    if (value_type != kWasmI32) return unsupported(decoder, "non-i32 load");
+    if (value_type != kWasmI32 && value_type != kWasmF32)
+      return unsupported(decoder, "unsupported load type");
     LiftoffRegList pinned;
     Register index = pinned.set(__ PopToRegister(kGpReg)).gp();
     if (!env_->use_trap_handler) {
@@ -834,7 +835,8 @@ class LiftoffCompiler {
                 const MemoryAccessOperand<validate>& operand,
                 const Value& index_val, const Value& value_val) {
     ValueType value_type = type.value_type();
-    if (value_type != kWasmI32) return unsupported(decoder, "non-i32 store");
+    if (value_type != kWasmI32 && value_type != kWasmF32)
+      return unsupported(decoder, "unsupported store type");
     RegClass rc = reg_class_for(value_type);
     LiftoffRegList pinned;
     LiftoffRegister value = pinned.set(__ PopToRegister(rc));

src/wasm/baseline/x64/liftoff-assembler-x64.h

@@ -112,6 +112,9 @@ void LiftoffAssembler::Load(LiftoffRegister dst, Register src_addr,
     case LoadType::kI64Load:
       movq(dst.gp(), src_op);
       break;
+    case LoadType::kF32Load:
+      Movss(dst.fp(), src_op);
+      break;
     default:
       UNREACHABLE();
   }
@@ -148,6 +151,9 @@ void LiftoffAssembler::Store(Register dst_addr, Register offset_reg,
     case StoreType::kI64Store:
       movq(dst_op, src.gp());
       break;
+    case StoreType::kF32Store:
+      Movss(dst_op, src.fp());
+      break;
     default:
       UNREACHABLE();
   }