Revert of MIPS: Add FPXX support to MIPS32R2

src/mips/constants-mips.h

 // Copyright 2012 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.
 
 #ifndef  V8_MIPS_CONSTANTS_H_
 #define  V8_MIPS_CONSTANTS_H_
 #include "src/globals.h"
 // UNIMPLEMENTED_ macro for MIPS.
 #ifdef DEBUG
 #define UNIMPLEMENTED_MIPS()                                                  \
@@ skipping 46 matching lines @@
   kFP32,
   kFP64,
   kFPXX
 };
 
 #if defined(FPU_MODE_FP32)
   static const FpuMode kFpuMode = kFP32;
 #elif defined(FPU_MODE_FP64)
   static const FpuMode kFpuMode = kFP64;
 #elif defined(FPU_MODE_FPXX)
-#if defined(_MIPS_ARCH_MIPS32R2) || defined(_MIPS_ARCH_MIPS32R6)
-static const FpuMode kFpuMode = kFPXX;
+  static const FpuMode kFpuMode = kFPXX;
 #else
-#error "FPXX is supported only on Mips32R2 and Mips32R6"
-#endif
-#else
-static const FpuMode kFpuMode = kFP32;
+  static const FpuMode kFpuMode = kFP32;
 #endif
 
 #if(defined(__mips_hard_float) && __mips_hard_float != 0)
 // Use floating-point coprocessor instructions. This flag is raised when
 // -mhard-float is passed to the compiler.
 const bool IsMipsSoftFloatABI = false;
 #elif(defined(__mips_soft_float) && __mips_soft_float != 0)
 // This flag is raised when -msoft-float is passed to the compiler.
 // Although FPU is a base requirement for v8, soft-float ABI is used
 // on soft-float systems with FPU kernel emulation.
 const bool IsMipsSoftFloatABI = true;
 #else
 const bool IsMipsSoftFloatABI = true;
 #endif
 
 #if defined(V8_TARGET_LITTLE_ENDIAN)
 const uint32_t kHoleNanUpper32Offset = 4;
 const uint32_t kHoleNanLower32Offset = 0;
 #elif defined(V8_TARGET_BIG_ENDIAN)
 const uint32_t kHoleNanUpper32Offset = 0;
 const uint32_t kHoleNanLower32Offset = 4;
 #else
 #error Unknown endianness
 #endif
 
-#define IsFp64Mode() (kFpuMode == kFP64)
-#define IsFp32Mode() (kFpuMode == kFP32)
-#define IsFpxxMode() (kFpuMode == kFPXX)
+#ifndef FPU_MODE_FPXX
+#define IsFp64Mode() \
+  (kFpuMode == kFP64)
+#else
+#define IsFp64Mode() \
+  (CpuFeatures::IsSupported(FP64FPU))
+#endif
 
 #ifndef _MIPS_ARCH_MIPS32RX
 #define IsMipsArchVariant(check) \
   (kArchVariant == check)
 #else
 #define IsMipsArchVariant(check) \
   (CpuFeatures::IsSupported(static_cast<CpuFeature>(check)))
 #endif
 
 
@@ skipping 1105 matching lines @@
       }
   }
 }
 
 #undef OpcodeToBitNumber
 #undef FunctionFieldToBitNumber
 }  // namespace internal
 }  // namespace v8
 
 #endif    // #ifndef V8_MIPS_CONSTANTS_H_