# HG changeset patch
# User Roland Schatz <roland.schatz@oracle.com>
# Date 1363094686 -3600
# Node ID 7a81fbcd67bbaa805cfd0b99f2b1b111f43e15e3
# Parent  2c5df42999dd9236e31f5ff01c1033affdb96679
Debug option to reduce available registers.

diff -r 2c5df42999dd -r 7a81fbcd67bb graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/LinearScan.java
--- a/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/LinearScan.java	Tue Mar 12 10:02:20 2013 +0100
+++ b/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/LinearScan.java	Tue Mar 12 14:24:46 2013 +0100
@@ -282,7 +282,6 @@
      * @return the created interval
      */
     Interval createInterval(Value operand) {
-        assert isProcessed(operand);
         assert isLegal(operand);
         int operandNumber = operandNumber(operand);
         Interval interval = new Interval(operand, operandNumber);
@@ -1951,12 +1950,6 @@
                 throw new GraalInternalError("");
             }
 
-            if (!isProcessed(i1.location())) {
-                TTY.println("Can not have an Interval for an ignored register " + i1.location());
-                TTY.println(i1.logString(this));
-                throw new GraalInternalError("");
-            }
-
             if (i1.first() == Range.EndMarker) {
                 TTY.println("Interval %d has no Range", i1.operandNumber);
                 TTY.println(i1.logString(this));
diff -r 2c5df42999dd -r 7a81fbcd67bb graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java
--- a/graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java	Tue Mar 12 10:02:20 2013 +0100
+++ b/graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java	Tue Mar 12 14:24:46 2013 +0100
@@ -33,15 +33,12 @@
 import com.oracle.graal.api.meta.*;
 import com.oracle.graal.graph.*;
 import com.oracle.graal.hotspot.*;
+import com.oracle.graal.phases.*;
 
 // @formatter:off
 public class AMD64HotSpotRegisterConfig implements RegisterConfig {
 
-    private final Register[] allocatable = {
-        rax, rbx, rcx, rdx, /*rsp,*/ rbp, rsi, rdi, r8, r9, /* r10, */r11, r12, r13, r14, /*r15, */
-        xmm0, xmm1, xmm2,  xmm3,  xmm4,  xmm5,  xmm6,  xmm7,
-        xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15
-    };
+    private final Register[] allocatable = initAllocatable();
 
     private final EnumMap<RegisterFlag, Register[]> categorized = Register.categorize(allocatable);
 
@@ -68,6 +65,34 @@
 
     private final CalleeSaveLayout csl;
 
+    private static Register findRegister(String name, Register[] all) {
+        for (Register reg : all) {
+            if (reg.name.equals(name)) {
+                return reg;
+            }
+        }
+        throw new IllegalArgumentException("register " + name + " is not allocatable");
+    }
+
+    private static Register[] initAllocatable() {
+        Register[] allocatable = {
+                        rax, rbx, rcx, rdx, /*rsp,*/ rbp, rsi, rdi, r8, r9, /* r10, */r11, r12, r13, r14, /*r15, */
+                        xmm0, xmm1, xmm2,  xmm3,  xmm4,  xmm5,  xmm6,  xmm7,
+                        xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15
+                    };
+
+        if (GraalOptions.RegisterPressure != null) {
+            String[] names = GraalOptions.RegisterPressure.split(",");
+            Register[] regs = new Register[names.length];
+            for (int i = 0; i < names.length; i++) {
+                regs[i] = findRegister(names[i], allocatable);
+            }
+            return regs;
+        }
+
+        return allocatable;
+    }
+
     public AMD64HotSpotRegisterConfig(HotSpotVMConfig config, boolean globalStubConfig) {
         if (config.windowsOs) {
             javaGeneralParameterRegisters = new Register[] {rdx, r8, r9, rdi, rsi, rcx};
diff -r 2c5df42999dd -r 7a81fbcd67bb graal/com.oracle.graal.phases/src/com/oracle/graal/phases/GraalOptions.java
--- a/graal/com.oracle.graal.phases/src/com/oracle/graal/phases/GraalOptions.java	Tue Mar 12 10:02:20 2013 +0100
+++ b/graal/com.oracle.graal.phases/src/com/oracle/graal/phases/GraalOptions.java	Tue Mar 12 14:24:46 2013 +0100
@@ -148,6 +148,9 @@
     public static boolean ExitVMOnBailout                    = ____;
     public static boolean ExitVMOnException                  = true;
 
+    // Register allocator debugging
+    public static String  RegisterPressure                   = null;
+
     // Code generator settings
     public static boolean ConditionalElimination             = true;
     public static boolean CullFrameStates                    = ____;