--- a/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMetaAccessProvider.java	Tue Jan 09 22:30:20 2018 -0500
+++ b/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMetaAccessProvider.java	Wed Jan 10 09:04:11 2018 +0100
@@ -34,7 +34,6 @@
 import java.util.Objects;
 
 import jdk.vm.ci.code.CodeUtil;
-import jdk.vm.ci.code.TargetDescription;
 import jdk.vm.ci.common.JVMCIError;
 import jdk.vm.ci.meta.DeoptimizationAction;
 import jdk.vm.ci.meta.DeoptimizationReason;
@@ -284,11 +283,9 @@
                     ResolvedJavaType elementType = lookupJavaType.getComponentType();
                     JavaKind elementKind = elementType.getJavaKind();
                     final int headerSize = getArrayBaseOffset(elementKind);
-                    TargetDescription target = runtime.getHostJVMCIBackend().getTarget();
                     int sizeOfElement = getArrayIndexScale(elementKind);
-                    int alignment = target.wordSize;
                     int log2ElementSize = CodeUtil.log2(sizeOfElement);
-                    return computeArrayAllocationSize(length, alignment, headerSize, log2ElementSize);
+                    return computeArrayAllocationSize(length, headerSize, log2ElementSize);
                 }
                 return lookupJavaType.instanceSize();
             }
@@ -303,11 +300,13 @@
      * alignment requirements.
      *
      * @param length the number of elements in the array
-     * @param alignment the object alignment requirement
      * @param headerSize the size of the array header
      * @param log2ElementSize log2 of the size of an element in the array
+     * @return the size of the memory chunk
      */
-    public static int computeArrayAllocationSize(int length, int alignment, int headerSize, int log2ElementSize) {
+    public int computeArrayAllocationSize(int length, int headerSize, int log2ElementSize) {
+        HotSpotVMConfig config = runtime.getConfig();
+        int alignment = config.objectAlignment;
         int size = (length << log2ElementSize) + headerSize + (alignment - 1);
         int mask = ~(alignment - 1);
         return size & mask;

--- a/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfig.java	Tue Jan 09 22:30:20 2018 -0500
+++ b/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfig.java	Wed Jan 10 09:04:11 2018 +0100
@@ -68,6 +68,8 @@
 
     final boolean useCompressedOops = getFlag("UseCompressedOops", Boolean.class);
 
+    final int objectAlignment = getFlag("ObjectAlignmentInBytes", Integer.class);
+
     final int prototypeMarkWordOffset = getFieldOffset("Klass::_prototype_header", Integer.class, "markOop");
     final int subklassOffset = getFieldOffset("Klass::_subklass", Integer.class, "Klass*");
     final int nextSiblingOffset = getFieldOffset("Klass::_next_sibling", Integer.class, "Klass*");

--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java	Tue Jan 09 22:30:20 2018 -0500
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java	Wed Jan 10 09:04:11 2018 +0100
@@ -566,6 +566,28 @@
     }
 
     @Fold
+    public static int objectAlignment(@InjectedParameter GraalHotSpotVMConfig config) {
+        return config.objectAlignment;
+    }
+
+    /**
+     * Computes the size of the memory chunk allocated for an array. This size accounts for the
+     * array header size, body size and any padding after the last element to satisfy object
+     * alignment requirements.
+     *
+     * @param length the number of elements in the array
+     * @param headerSize the size of the array header
+     * @param log2ElementSize log2 of the size of an element in the array
+     * @return the size of the memory chunk
+     */
+    public static int arrayAllocationSize(int length, int headerSize, int log2ElementSize) {
+        int alignment = objectAlignment(INJECTED_VMCONFIG);
+        int size = (length << log2ElementSize) + headerSize + (alignment - 1);
+        int mask = ~(alignment - 1);
+        return size & mask;
+    }
+
+    @Fold
     public static int instanceHeaderSize(@InjectedParameter GraalHotSpotVMConfig config) {
         return config.useCompressedClassPointers ? (2 * wordSize()) - 4 : 2 * wordSize();
     }

--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/NewObjectSnippets.java	Tue Jan 09 22:30:20 2018 -0500
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/NewObjectSnippets.java	Wed Jan 10 09:04:11 2018 +0100
@@ -23,7 +23,6 @@
 package org.graalvm.compiler.hotspot.replacements;
 
 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayBaseOffset;
-import static jdk.vm.ci.hotspot.HotSpotMetaAccessProvider.computeArrayAllocationSize;
 import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC;
 import static org.graalvm.compiler.core.common.calc.UnsignedMath.belowThan;
 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG;
@@ -33,6 +32,7 @@
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.PROTOTYPE_MARK_WORD_LOCATION;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.TLAB_END_LOCATION;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.TLAB_TOP_LOCATION;
+import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayAllocationSize;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayKlassOffset;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayLengthOffset;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.config;
@@ -52,7 +52,6 @@
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.useBiasedLocking;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.useTLAB;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.verifyOop;
-import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.wordSize;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.writeTlabTop;
 import static org.graalvm.compiler.hotspot.replacements.HotspotSnippetsOptions.ProfileAllocations;
 import static org.graalvm.compiler.hotspot.replacements.HotspotSnippetsOptions.ProfileAllocationsContext;
@@ -315,8 +314,7 @@
     private static Object allocateArrayImpl(KlassPointer hub, int length, Word prototypeMarkWord, int headerSize, int log2ElementSize, boolean fillContents, Register threadRegister,
                     boolean maybeUnroll, String typeContext, boolean skipNegativeCheck, OptionValues options, Counters counters) {
         Object result;
-        int alignment = wordSize();
-        int allocationSize = computeArrayAllocationSize(length, alignment, headerSize, log2ElementSize);
+        int allocationSize = arrayAllocationSize(length, headerSize, log2ElementSize);
         Word thread = registerAsWord(threadRegister);
         Word top = readTlabTop(thread);
         Word end = readTlabEnd(thread);

--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/stubs/NewArrayStub.java	Tue Jan 09 22:30:20 2018 -0500
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/stubs/NewArrayStub.java	Wed Jan 10 09:04:11 2018 +0100
@@ -23,6 +23,7 @@
 package org.graalvm.compiler.hotspot.stubs;
 
 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG;
+import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayAllocationSize;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayPrototypeMarkWord;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.getAndClearObjectResult;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.layoutHelperElementTypeMask;
@@ -34,7 +35,6 @@
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readLayoutHelper;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.useCMSIncrementalMode;
-import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.wordSize;
 import static org.graalvm.compiler.hotspot.replacements.NewObjectSnippets.MAX_ARRAY_FAST_PATH_ALLOCATION_LENGTH;
 import static org.graalvm.compiler.hotspot.replacements.NewObjectSnippets.formatArray;
 import static org.graalvm.compiler.hotspot.stubs.NewInstanceStub.refillAllocate;
@@ -42,7 +42,6 @@
 import static org.graalvm.compiler.hotspot.stubs.StubUtil.newDescriptor;
 import static org.graalvm.compiler.hotspot.stubs.StubUtil.printf;
 import static org.graalvm.compiler.hotspot.stubs.StubUtil.verifyObject;
-import static jdk.vm.ci.hotspot.HotSpotMetaAccessProvider.computeArrayAllocationSize;
 
 import org.graalvm.compiler.api.replacements.Fold;
 import org.graalvm.compiler.api.replacements.Snippet;
@@ -112,7 +111,7 @@
         int log2ElementSize = (layoutHelper >> layoutHelperLog2ElementSizeShift(INJECTED_VMCONFIG)) & layoutHelperLog2ElementSizeMask(INJECTED_VMCONFIG);
         int headerSize = (layoutHelper >> layoutHelperHeaderSizeShift(INJECTED_VMCONFIG)) & layoutHelperHeaderSizeMask(INJECTED_VMCONFIG);
         int elementKind = (layoutHelper >> layoutHelperElementTypeShift(INJECTED_VMCONFIG)) & layoutHelperElementTypeMask(INJECTED_VMCONFIG);
-        int sizeInBytes = computeArrayAllocationSize(length, wordSize(), headerSize, log2ElementSize);
+        int sizeInBytes = arrayAllocationSize(length, headerSize, log2ElementSize);
         if (logging(options)) {
             printf("newArray: element kind %d\n", elementKind);
             printf("newArray: array length %d\n", length);