# HG changeset patch
# User Josef Eisl <josef.eisl@jku.at>
# Date 1428936827 -7200
# Node ID 6daa0fd4af52cc86ae568415a425191127a54bf8
# Parent  6aea1527de7b4d96ae2134d62f4d32c77ddd3b11
Catch OutOfRegistersException in LinearScanPhase and retry if RegisterPressure was specified.

diff -r 6aea1527de7b -r 6daa0fd4af52 graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/LinearScanPhase.java
--- a/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/LinearScanPhase.java	Mon Apr 13 11:50:27 2015 +0200
+++ b/graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/LinearScanPhase.java	Mon Apr 13 16:53:47 2015 +0200
@@ -22,6 +22,8 @@
  */
 package com.oracle.graal.lir.alloc.lsra;
 
+import static com.oracle.graal.compiler.common.GraalOptions.*;
+
 import java.util.*;
 
 import com.oracle.graal.api.code.*;
@@ -30,12 +32,25 @@
 import com.oracle.graal.lir.gen.*;
 import com.oracle.graal.lir.gen.LIRGeneratorTool.SpillMoveFactory;
 import com.oracle.graal.lir.phases.*;
+import com.oracle.graal.options.*;
+import com.oracle.graal.options.OptionValue.OverrideScope;
 
 public final class LinearScanPhase extends AllocationPhase {
 
     @Override
     protected <B extends AbstractBlockBase<B>> void run(TargetDescription target, LIRGenerationResult lirGenRes, List<B> codeEmittingOrder, List<B> linearScanOrder, SpillMoveFactory spillMoveFactory) {
-        new LinearScan(target, lirGenRes, spillMoveFactory, new RegisterAllocationConfig(lirGenRes.getFrameMapBuilder().getRegisterConfig())).allocate();
+        try {
+            new LinearScan(target, lirGenRes, spillMoveFactory, new RegisterAllocationConfig(lirGenRes.getFrameMapBuilder().getRegisterConfig())).allocate();
+        } catch (OutOfRegistersException e) {
+            if (RegisterPressure.getValue() != null) {
+                try (OverrideScope s = OptionValue.override(RegisterPressure, null)) {
+                    // retry with default register set
+                    new LinearScan(target, lirGenRes, spillMoveFactory, new RegisterAllocationConfig(lirGenRes.getFrameMapBuilder().getRegisterConfig())).allocate();
+                }
+            } else {
+                throw e;
+            }
+        }
     }
 
 }