[turbofan] ARM: Reduce out-of-line NaN code size

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 147 matching lines @@
 
 
 namespace {
 
 class OutOfLineLoadFloat32 final : public OutOfLineCode {
  public:
   OutOfLineLoadFloat32(CodeGenerator* gen, SwVfpRegister result)
       : OutOfLineCode(gen), result_(result) {}
 
   void Generate() final {
-    __ vmov(result_, std::numeric_limits<float>::quiet_NaN());
+    // Compute sqrtf(-1.0f), which results in a quiet single-precision NaN.
+    __ vmov(result_, -1.0f);
+    __ vsqrt(result_, result_);
   }
 
  private:
   SwVfpRegister const result_;
 };
 
 
 class OutOfLineLoadFloat64 final : public OutOfLineCode {
  public:
   OutOfLineLoadFloat64(CodeGenerator* gen, DwVfpRegister result)
       : OutOfLineCode(gen), result_(result) {}
 
   void Generate() final {
-    __ vmov(result_, std::numeric_limits<double>::quiet_NaN(), kScratchReg);
+    // Compute sqrt(-1.0), which results in a quiet double-precision NaN.
+    __ vmov(result_, -1.0);
+    __ vsqrt(result_, result_);
   }
 
  private:
   DwVfpRegister const result_;
 };
 
 
 class OutOfLineLoadInteger final : public OutOfLineCode {
  public:
   OutOfLineLoadInteger(CodeGenerator* gen, Register result)
@@ skipping 1279 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8