[arm] Clean up the use of UNALIGNED_ACCESSES.

src/arm/assembler-arm.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 54 matching lines @@
 #endif  // CAN_USE_ARMV7_INSTRUCTIONS
 #ifdef CAN_USE_VFP3_INSTRUCTIONS
   if (FLAG_enable_vfp3) answer |= 1u << VFP3 | 1u << ARMv7;
 #endif  // CAN_USE_VFP3_INSTRUCTIONS
 #ifdef CAN_USE_VFP32DREGS
   if (FLAG_enable_32dregs) answer |= 1u << VFP32DREGS;
 #endif  // CAN_USE_VFP32DREGS
 #ifdef CAN_USE_NEON
   if (FLAG_enable_neon) answer |= 1u << NEON;
 #endif  // CAN_USE_VFP32DREGS
-  if ((answer & (1u << ARMv7)) && FLAG_enable_unaligned_accesses) {
-    answer |= 1u << UNALIGNED_ACCESSES;
-  }
 
   return answer;
 }
 
 
 void CpuFeatures::ProbeImpl(bool cross_compile) {
   supported_ |= CpuFeaturesImpliedByCompiler();
   dcache_line_size_ = 64;
 
   // Only use statically determined features for cross compile (snapshot).
   if (cross_compile) return;
 
 #ifndef __arm__
   // For the simulator build, use whatever the flags specify.
   if (FLAG_enable_armv8) {
     supported_ |= 1u << ARMv8;
     // ARMv8 always features VFP and NEON.
     supported_ |= 1u << ARMv7 | 1u << VFP3 | 1u << NEON | 1u << VFP32DREGS;
     supported_ |= 1u << SUDIV;
     if (FLAG_enable_movw_movt) supported_ |= 1u << MOVW_MOVT_IMMEDIATE_LOADS;
   }
   if (FLAG_enable_armv7) {
     supported_ |= 1u << ARMv7;
     if (FLAG_enable_vfp3) supported_ |= 1u << VFP3;
     if (FLAG_enable_neon) supported_ |= 1u << NEON | 1u << VFP32DREGS;
     if (FLAG_enable_sudiv) supported_ |= 1u << SUDIV;
     if (FLAG_enable_movw_movt) supported_ |= 1u << MOVW_MOVT_IMMEDIATE_LOADS;
     if (FLAG_enable_32dregs) supported_ |= 1u << VFP32DREGS;
   }
-  if (FLAG_enable_unaligned_accesses) supported_ |= 1u << UNALIGNED_ACCESSES;
 
 #else  // __arm__
   // Probe for additional features at runtime.
   base::CPU cpu;
   if (FLAG_enable_vfp3 && cpu.has_vfp3()) {
     // This implementation also sets the VFP flags if runtime
     // detection of VFP returns true. VFPv3 implies ARMv7, see ARM DDI
     // 0406B, page A1-6.
     supported_ |= 1u << VFP3 | 1u << ARMv7;
   }
 
   if (FLAG_enable_neon && cpu.has_neon()) supported_ |= 1u << NEON;
   if (FLAG_enable_sudiv && cpu.has_idiva()) supported_ |= 1u << SUDIV;
 
   if (cpu.architecture() >= 7) {
     if (FLAG_enable_armv7) supported_ |= 1u << ARMv7;
     if (FLAG_enable_armv8 && cpu.architecture() >= 8) {
       supported_ |= 1u << ARMv8;
     }
-    if (FLAG_enable_unaligned_accesses) supported_ |= 1u << UNALIGNED_ACCESSES;
     // Use movw/movt for QUALCOMM ARMv7 cores.
     if (FLAG_enable_movw_movt && cpu.implementer() == base::CPU::QUALCOMM) {
       supported_ |= 1u << MOVW_MOVT_IMMEDIATE_LOADS;
     }
   }
 
   // ARM Cortex-A9 and Cortex-A5 have 32 byte cachelines.
   if (cpu.implementer() == base::CPU::ARM &&
       (cpu.part() == base::CPU::ARM_CORTEX_A5 ||
        cpu.part() == base::CPU::ARM_CORTEX_A9)) {
@@ skipping 57 matching lines @@
 
   printf("target%s%s %s%s%s %s\n",
          arm_target_type, arm_no_probe, arm_arch, arm_fpu, arm_thumb,
          arm_float_abi);
 }
 
 
 void CpuFeatures::PrintFeatures() {
   printf(
       "ARMv8=%d ARMv7=%d VFP3=%d VFP32DREGS=%d NEON=%d SUDIV=%d "
-      "UNALIGNED_ACCESSES=%d MOVW_MOVT_IMMEDIATE_LOADS=%d",
+      "MOVW_MOVT_IMMEDIATE_LOADS=%d",
       CpuFeatures::IsSupported(ARMv8), CpuFeatures::IsSupported(ARMv7),
       CpuFeatures::IsSupported(VFP3), CpuFeatures::IsSupported(VFP32DREGS),
       CpuFeatures::IsSupported(NEON), CpuFeatures::IsSupported(SUDIV),
-      CpuFeatures::IsSupported(UNALIGNED_ACCESSES),
       CpuFeatures::IsSupported(MOVW_MOVT_IMMEDIATE_LOADS));
 #ifdef __arm__
   bool eabi_hardfloat = base::OS::ArmUsingHardFloat();
 #elif USE_EABI_HARDFLOAT
   bool eabi_hardfloat = true;
 #else
   bool eabi_hardfloat = false;
 #endif
     printf(" USE_EABI_HARDFLOAT=%d\n", eabi_hardfloat);
 }
@@ skipping 4031 matching lines @@
     DCHECK(is_uint12(offset));
     instr_at_put(pc, SetLdrRegisterImmediateOffset(instr, offset));
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM