Reuse promoted register temporarily

AtomicLong (x86) is implemented as an intrinsic, which uses
the cmpxchng8b instruction.
This instruction requires 4 physical registers plus 2 more used for
the memory operand. On x86 we have only 4 temporaries. The code tried
to solve this by using MarkTemp utility, but this was not meant to be
used with promoted registers. The problem is that MarkTemp does not
spill anything and as a result we can lose VR.

If the registers are promoted this patch just reuses the values pushed
on the stack.

Change-Id: Ifec9183e2483cf704d0d1166a1004a9aa07b4f1d
Signed-off-by: Serguei Katkov <serguei.i.katkov@intel.com>
Signed-off-by: Yevgeny Rouban <yevgeny.y.rouban@intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/test/083-compiler-regressions/src/Main.java b/test/083-compiler-regressions/src/Main.java
index 96c71cf..2745c27 100644
--- a/test/083-compiler-regressions/src/Main.java
+++ b/test/083-compiler-regressions/src/Main.java
@@ -15,6 +15,7 @@
  */
 
 import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * Test for Jit regressions.
@@ -47,6 +48,18 @@ public class Main {
         ZeroTests.longModTest();
         MirOpSelectTests.testIfCcz();
         ManyFloatArgs();
+        atomicLong();
+    }
+
+    public static void atomicLong() {
+        AtomicLong atomicLong = new AtomicLong();
+        atomicLong.addAndGet(3);
+        atomicLong.addAndGet(2);
+        atomicLong.addAndGet(1);
+        long result = atomicLong.get();
+        System.out.println(result == 6L ? "atomicLong passes" :
+          ("atomicLong failes: returns " + result + ", expected 6")
+        );
     }
 
     public static void returnConstantTest() {