# HG changeset patch
# User Doug Simon <doug.simon@oracle.com>
# Date 1395229363 -3600
# Node ID abf7cf57df5ec023abb39706ef0a02c28b82fc0d
# Parent  1d853e629891b036c62b6d2bd8e20f0f77fcb11e
added RegisterConfig.areAllAllocatableRegistersCallerSaved()

diff -r 1d853e629891 -r abf7cf57df5e graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterConfig.java
--- a/graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterConfig.java	Wed Mar 19 12:01:30 2014 +0100
+++ b/graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterConfig.java	Wed Mar 19 12:42:43 2014 +0100
@@ -102,4 +102,10 @@
      * @return the register playing the role specified by {@code id}
      */
     Register getRegisterForRole(int id);
+
+    /**
+     * Determines if all {@link #getAllocatableRegisters() allocatable} registers are
+     * {@link #getCallerSaveRegisters() caller saved}.
+     */
+    boolean areAllAllocatableRegistersCallerSaved();
 }
diff -r 1d853e629891 -r abf7cf57df5e graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/LinearScanWalker.java
--- a/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/LinearScanWalker.java	Wed Mar 19 12:01:30 2014 +0100
+++ b/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/alloc/LinearScanWalker.java	Wed Mar 19 12:42:43 2014 +0100
@@ -70,11 +70,8 @@
         super(allocator, unhandledFixedFirst, unhandledAnyFirst);
 
         // If all allocatable registers are caller saved, then no registers are live across a call
-        // site.
-        // The register allocator can save time not trying to find a register at a call site.
-        HashSet<Register> registers = new HashSet<>(Arrays.asList(allocator.frameMap.registerConfig.getAllocatableRegisters()));
-        registers.removeAll(Arrays.asList(allocator.frameMap.registerConfig.getCallerSaveRegisters()));
-        allocator.callKillsRegisters = registers.size() == 0;
+        // site. The register allocator can save time not trying to find a register at a call site.
+        allocator.callKillsRegisters = allocator.frameMap.registerConfig.areAllAllocatableRegistersCallerSaved();
 
         moveResolver = new MoveResolver(allocator);
         spillIntervals = Util.uncheckedCast(new List[allocator.registers.length]);
diff -r 1d853e629891 -r abf7cf57df5e 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	Wed Mar 19 12:01:30 2014 +0100
+++ b/graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java	Wed Mar 19 12:42:43 2014 +0100
@@ -48,6 +48,8 @@
      */
     private final Register[] callerSaved;
 
+    private final boolean allAllocatableAreCallerSaved;
+
     private final HashMap<PlatformKind, Register[]> categorized = new HashMap<>();
 
     private final RegisterAttributes[] attributesMap;
@@ -152,6 +154,7 @@
         callerSaved = callerSaveSet.toArray(new Register[callerSaveSet.size()]);
         assert callerSaved.length == allocatable.length || RegisterPressure.getValue() != null;
 
+        allAllocatableAreCallerSaved = true;
         attributesMap = RegisterAttributes.createMap(this, AMD64.allRegisters);
     }
 
@@ -161,6 +164,11 @@
     }
 
     @Override
+    public boolean areAllAllocatableRegistersCallerSaved() {
+        return allAllocatableAreCallerSaved;
+    }
+
+    @Override
     public Register getRegisterForRole(int index) {
         throw new UnsupportedOperationException();
     }
diff -r 1d853e629891 -r abf7cf57df5e graal/com.oracle.graal.hotspot.ptx/src/com/oracle/graal/hotspot/ptx/PTXHotSpotRegisterConfig.java
--- a/graal/com.oracle.graal.hotspot.ptx/src/com/oracle/graal/hotspot/ptx/PTXHotSpotRegisterConfig.java	Wed Mar 19 12:01:30 2014 +0100
+++ b/graal/com.oracle.graal.hotspot.ptx/src/com/oracle/graal/hotspot/ptx/PTXHotSpotRegisterConfig.java	Wed Mar 19 12:42:43 2014 +0100
@@ -74,6 +74,11 @@
     }
 
     @Override
+    public boolean areAllAllocatableRegistersCallerSaved() {
+        throw GraalInternalError.unimplemented();
+    }
+
+    @Override
     public Register getRegisterForRole(int index) {
         throw GraalInternalError.unimplemented("PTXHotSpotRegisterConfig.getRegisterForRole()");
     }
diff -r 1d853e629891 -r abf7cf57df5e graal/com.oracle.graal.hotspot.sparc/src/com/oracle/graal/hotspot/sparc/SPARCHotSpotRegisterConfig.java
--- a/graal/com.oracle.graal.hotspot.sparc/src/com/oracle/graal/hotspot/sparc/SPARCHotSpotRegisterConfig.java	Wed Mar 19 12:01:30 2014 +0100
+++ b/graal/com.oracle.graal.hotspot.sparc/src/com/oracle/graal/hotspot/sparc/SPARCHotSpotRegisterConfig.java	Wed Mar 19 12:42:43 2014 +0100
@@ -144,6 +144,11 @@
     }
 
     @Override
+    public boolean areAllAllocatableRegistersCallerSaved() {
+        return false;
+    }
+
+    @Override
     public Register getRegisterForRole(int index) {
         throw new UnsupportedOperationException();
     }
diff -r 1d853e629891 -r abf7cf57df5e graal/com.oracle.graal.hsail/src/com/oracle/graal/hsail/HSAILRegisterConfig.java
--- a/graal/com.oracle.graal.hsail/src/com/oracle/graal/hsail/HSAILRegisterConfig.java	Wed Mar 19 12:01:30 2014 +0100
+++ b/graal/com.oracle.graal.hsail/src/com/oracle/graal/hsail/HSAILRegisterConfig.java	Wed Mar 19 12:42:43 2014 +0100
@@ -24,7 +24,6 @@
 package com.oracle.graal.hsail;
 
 import com.oracle.graal.api.code.*;
-
 import com.oracle.graal.api.code.CallingConvention.Type;
 import com.oracle.graal.api.meta.*;
 import com.oracle.graal.graph.*;
@@ -168,6 +167,11 @@
     }
 
     @Override
+    public boolean areAllAllocatableRegistersCallerSaved() {
+        throw GraalInternalError.unimplemented();
+    }
+
+    @Override
     public CalleeSaveLayout getCalleeSaveLayout() {
         return null;
     }