Preserves callee-saved FPU registers on ARM

runtime/vm/assembler_arm_test.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 1282 matching lines @@
 ASSEMBLER_TEST_RUN(VstmsVldms1, test) {
   EXPECT(test != NULL);
   typedef int (*Tst)();
   EXPECT_EQ(42, EXECUTE_TEST_CODE_INT32(Tst, test->entry()));
 }
 
 
 // Make sure we can store the D registers using vstmd and
 // load them into a different set using vldmd
 ASSEMBLER_TEST_GENERATE(VstmdVldmd_off, assembler) {
+  // Save used callee-saved FPU registers.
+  __ vstmd(DB_W, SP, D8, 3);
   __ LoadDImmediate(D0, 0.0, R0);
   __ LoadDImmediate(D1, 1.0, R0);
   __ LoadDImmediate(D2, 2.0, R0);
   __ LoadDImmediate(D3, 3.0, R0);
   __ LoadDImmediate(D4, 4.0, R0);
   __ LoadDImmediate(D5, 5.0, R0);
   __ vstmd(DB_W, SP, D0, 5);  // Push D0 - D4 onto the stack, dec SP
   __ vldmd(IA_W, SP, D5, 5);  // Pop stack into D5 - D9, inc SP
 
   // Load success value into R0
@@ skipping 23 matching lines @@
   __ vcmpd(D6, D10);
   __ vmstat();
   __ mov(R0, ShifterOperand(0), NE);  // Put failure into R0 if NE
 
   // Check that 0.0 is in D5
   __ LoadDImmediate(D10, 0.0, R1);
   __ vcmpd(D5, D10);
   __ vmstat();
   __ mov(R0, ShifterOperand(0), NE);  // Put failure into R0 if NE
 
+  // Restore used callee-saved FPU registers.
+  __ vldmd(IA_W, SP, D8, 3);
   __ bx(LR);
 }
 
 
 ASSEMBLER_TEST_RUN(VstmdVldmd_off, test) {
   EXPECT(test != NULL);
   typedef int (*Tst)();
   EXPECT_EQ(42, EXECUTE_TEST_CODE_INT32(Tst, test->entry()));
 }
 
@@ skipping 2180 matching lines @@
   __ StoreIntoObject(R2,
                      FieldAddress(R2, GrowableObjectArray::data_offset()),
                      R1);
   __ PopList((1 << CTX) | (1 << LR));
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM