# HG changeset patch
# User Roland Schatz <roland.schatz@oracle.com>
# Date 1391164780 -3600
# Node ID 6bc07d0c2682d05386fb17ed8a037240bb1453e9
# Parent  f5f81bc9c9f00e442c72c1c38ad5f4dbbe608804
Optimize back edge in tight loops.

diff -r f5f81bc9c9f0 -r 6bc07d0c2682 graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64ControlFlow.java
--- a/graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64ControlFlow.java	Fri Jan 31 11:38:32 2014 +0100
+++ b/graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64ControlFlow.java	Fri Jan 31 11:39:40 2014 +0100
@@ -75,6 +75,9 @@
         public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
             if (crb.isSuccessorEdge(trueDestination)) {
                 jcc(masm, true, falseDestination);
+            } else if (falseDestination.getSourceBlock() == falseDestination.getTargetBlock()) {
+                jcc(masm, true, falseDestination);
+                masm.jmp(trueDestination.label());
             } else {
                 jcc(masm, false, trueDestination);
                 if (!crb.isSuccessorEdge(falseDestination)) {