[arm] Clean up use of IsSupported and IsEnabled.

src/arm/deoptimizer-arm.cc

 // 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.
 
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/register-configuration.h"
 #include "src/safepoint-table.h"
 
@@ skipping 101 matching lines @@
 
   // Everything but pc, lr and ip which will be saved but not restored.
   RegList restored_regs = kJSCallerSaved | kCalleeSaved | ip.bit();
 
   const int kDoubleRegsSize = kDoubleSize * DwVfpRegister::kMaxNumRegisters;
 
   // Save all allocatable VFP registers before messing with them.
   DCHECK(kDoubleRegZero.code() == 14);
   DCHECK(kScratchDoubleReg.code() == 15);
 
-  // Check CPU flags for number of registers, setting the Z condition flag.
-  __ CheckFor32DRegs(ip);
+  {
+    // We use a run-time check for VFP32DREGS.
+    CpuFeatureScope scope(masm(), VFP32DREGS,
+                          CpuFeatureScope::kDontCheckSupported);
 
-  // Push registers d0-d15, and possibly d16-d31, on the stack.
-  // If d16-d31 are not pushed, decrease the stack pointer instead.
-  __ vstm(db_w, sp, d16, d31, ne);
-  __ sub(sp, sp, Operand(16 * kDoubleSize), LeaveCC, eq);
-  __ vstm(db_w, sp, d0, d15);
+    // Check CPU flags for number of registers, setting the Z condition flag.
+    __ CheckFor32DRegs(ip);
+
+    // Push registers d0-d15, and possibly d16-d31, on the stack.
+    // If d16-d31 are not pushed, decrease the stack pointer instead.
+    __ vstm(db_w, sp, d16, d31, ne);
+    __ sub(sp, sp, Operand(16 * kDoubleSize), LeaveCC, eq);
+    __ vstm(db_w, sp, d0, d15);
+  }
 
   // Push all 16 registers (needed to populate FrameDescription::registers_).
   // TODO(1588) Note that using pc with stm is deprecated, so we should perhaps
   // handle this a bit differently.
   __ stm(db_w, sp, restored_regs  | sp.bit() | lr.bit() | pc.bit());
 
   __ mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
   __ str(fp, MemOperand(ip));
 
   const int kSavedRegistersAreaSize =
@@ skipping 112 matching lines @@
   __ ldr(r6, MemOperand(r6, FrameDescription::frame_content_offset()));
   __ push(r6);
   __ bind(&inner_loop_header);
   __ cmp(r3, Operand::Zero());
   __ b(ne, &inner_push_loop);  // test for gt?
   __ add(r4, r4, Operand(kPointerSize));
   __ bind(&outer_loop_header);
   __ cmp(r4, r1);
   __ b(lt, &outer_push_loop);
 
-  // Check CPU flags for number of registers, setting the Z condition flag.
-  __ CheckFor32DRegs(ip);
-
   __ ldr(r1, MemOperand(r0, Deoptimizer::input_offset()));
   for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
     int code = config->GetAllocatableDoubleCode(i);
     DwVfpRegister reg = DwVfpRegister::from_code(code);
     int src_offset = code * kDoubleSize + double_regs_offset;
     __ vldr(reg, r1, src_offset);
   }
 
   // Push state, pc, and continuation from the last output frame.
   __ ldr(r6, MemOperand(r2, FrameDescription::state_offset()));
@@ skipping 89 matching lines @@
 void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
   DCHECK(FLAG_enable_embedded_constant_pool);
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8