VM: Emit compacter code for x64 branches to external labels.

runtime/vm/assembler_x64_test.cc

 // Copyright (c) 2012, 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_X64)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 1790 matching lines @@
   __ jmp(&call1);
 }
 
 
 ASSEMBLER_TEST_RUN(JumpSimpleLeaf, test) {
   typedef int (*JumpSimpleLeafCode)();
   EXPECT_EQ(42, reinterpret_cast<JumpSimpleLeafCode>(test->entry())());
 }
 
 
+ASSEMBLER_TEST_GENERATE(JumpIndirect, assembler) {
+  ExternalLabel call1(reinterpret_cast<uword>(LeafReturn42));
+  __ movq(Address(CallingConventions::kArg1Reg, 0), Immediate(call1.address()));
+  __ jmp(Address(CallingConventions::kArg1Reg, 0));
+}
+
+
+ASSEMBLER_TEST_RUN(JumpIndirect, test) {
+  uword temp = 0;
+  typedef int (*JumpIndirect)(uword*);
+  EXPECT_EQ(42, reinterpret_cast<JumpIndirect>(test->entry())(&temp));
+}
+
+
 ASSEMBLER_TEST_GENERATE(SingleFPMoves, assembler) {
   __ movq(RAX, Immediate(bit_cast<int32_t, float>(234.0f)));
   __ movd(XMM0, RAX);
   __ movss(XMM1, XMM0);
   __ movss(XMM2, XMM1);
   __ movss(XMM3, XMM2);
   __ movss(XMM4, XMM3);
   __ movss(XMM5, XMM4);
   __ movss(XMM6, XMM5);
   __ movss(XMM7, XMM6);
@@ skipping 1715 matching lines @@
   EXPECT_EQ(ICData::kInt64RangeBit, range_of(Integer::New(kMaxInt64)));
   EXPECT_EQ(ICData::kInt64RangeBit, range_of(Integer::New(kMinInt64)));
 
   EXPECT_EQ(0, range_of(Bool::True().raw()));
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64