Merge "X86_64: Replace x86_64 xchg instruction use"

am: a1eff4f

* commit 'a1eff4f279253bbc90d2697d7c15390bcab65d1e':
  X86_64: Replace x86_64 xchg instruction use

Change-Id: I3a95d8b662a424f0f218acf31894fdf86b4bbca2

2 files changed, 8 insertions, 1 deletions

diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index d24b5bbd56..b20043c545 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -5249,6 +5249,12 @@ void ParallelMoveResolverX86_64::Exchange32(int mem1, int mem2) {
           CpuRegister(ensure_scratch.GetRegister()));
 }
 
+void ParallelMoveResolverX86_64::Exchange64(CpuRegister reg1, CpuRegister reg2) {
+  __ movq(CpuRegister(TMP), reg1);
+  __ movq(reg1, reg2);
+  __ movq(reg2, CpuRegister(TMP));
+}
+
 void ParallelMoveResolverX86_64::Exchange64(CpuRegister reg, int mem) {
   __ movq(CpuRegister(TMP), Address(CpuRegister(RSP), mem));
   __ movq(Address(CpuRegister(RSP), mem), reg);
@@ -5286,7 +5292,7 @@ void ParallelMoveResolverX86_64::EmitSwap(size_t index) {
   Location destination = move->GetDestination();
 
   if (source.IsRegister() && destination.IsRegister()) {
-    __ xchgq(destination.AsRegister<CpuRegister>(), source.AsRegister<CpuRegister>());
+    Exchange64(source.AsRegister<CpuRegister>(), destination.AsRegister<CpuRegister>());
   } else if (source.IsRegister() && destination.IsStackSlot()) {
     Exchange32(source.AsRegister<CpuRegister>(), destination.GetStackIndex());
   } else if (source.IsStackSlot() && destination.IsRegister()) {
diff --git a/compiler/optimizing/code_generator_x86_64.h b/compiler/optimizing/code_generator_x86_64.h
index c3fce6e824..396ddf2889 100644
--- a/compiler/optimizing/code_generator_x86_64.h
+++ b/compiler/optimizing/code_generator_x86_64.h
@@ -142,6 +142,7 @@ class ParallelMoveResolverX86_64 : public ParallelMoveResolverWithSwap {
   void Exchange32(CpuRegister reg, int mem);
   void Exchange32(XmmRegister reg, int mem);
   void Exchange32(int mem1, int mem2);
+  void Exchange64(CpuRegister reg1, CpuRegister reg2);
   void Exchange64(CpuRegister reg, int mem);
   void Exchange64(XmmRegister reg, int mem);
   void Exchange64(int mem1, int mem2);