ARM: Add support load/store multiple VFP registers

src/arm/macro-assembler-arm.cc

 // Copyright 2011 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 731 matching lines @@
   str(ip, MemOperand(fp, ExitFrameConstants::kCodeOffset));
 
   // Save the frame pointer and the context in top.
   mov(ip, Operand(ExternalReference(Isolate::k_c_entry_fp_address, isolate())));
   str(fp, MemOperand(ip));
   mov(ip, Operand(ExternalReference(Isolate::k_context_address, isolate())));
   str(cp, MemOperand(ip));
 
   // Optionally save all double registers.
   if (save_doubles) {
-    sub(sp, sp, Operand(DwVfpRegister::kNumRegisters * kDoubleSize));
-    const int offset = -2 * kPointerSize;
-    for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
-      DwVfpRegister reg = DwVfpRegister::from_code(i);
-      vstr(reg, fp, offset - ((i + 1) * kDoubleSize));
-    }
+    DwVfpRegister first = d0;
+    DwVfpRegister last =
+        DwVfpRegister::from_code(DwVfpRegister::kNumRegisters - 1);
+    vstm(db_w, sp, first, last);
     // Note that d0 will be accessible at
     //   fp - 2 * kPointerSize - DwVfpRegister::kNumRegisters * kDoubleSize,
     // since the sp slot and code slot were pushed after the fp.
   }
 
   // Reserve place for the return address and stack space and align the frame
   // preparing for calling the runtime function.
   const int frame_alignment = MacroAssembler::ActivationFrameAlignment();
   sub(sp, sp, Operand((stack_space + 1) * kPointerSize));
   if (frame_alignment > 0) {
@@ skipping 36 matching lines @@
   // flag.
   return FLAG_sim_stack_alignment;
 #endif  // defined(V8_HOST_ARCH_ARM)
 }
 
 
 void MacroAssembler::LeaveExitFrame(bool save_doubles,
                                     Register argument_count) {
   // Optionally restore all double registers.
   if (save_doubles) {
-    for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
-      DwVfpRegister reg = DwVfpRegister::from_code(i);
-      const int offset = -2 * kPointerSize;
-      vldr(reg, fp, offset - ((i + 1) * kDoubleSize));
-    }
+    // Calculate the stack location of the saved doubles and restore them.
+    const int offset = 2 * kPointerSize;
+    sub(r3, fp, Operand(offset + DwVfpRegister::kNumRegisters * kDoubleSize));
+    DwVfpRegister first = d0;
+    DwVfpRegister last =
+        DwVfpRegister::from_code(DwVfpRegister::kNumRegisters - 1);
+    vldm(ia, r3, first, last);
   }
 
   // Clear top frame.
   mov(r3, Operand(0, RelocInfo::NONE));
   mov(ip, Operand(ExternalReference(Isolate::k_c_entry_fp_address, isolate())));
   str(r3, MemOperand(ip));
 
   // Restore current context from top and clear it in debug mode.
   mov(ip, Operand(ExternalReference(Isolate::k_context_address, isolate())));
   ldr(cp, MemOperand(ip));
@@ skipping 2101 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM