org.graalvm.compiler.replacements

Class NodeStrideUtil

java.lang.Object

org.graalvm.compiler.replacements.NodeStrideUtil

public final class NodeStrideUtil
extends Object

This class provides utility methods for "stride-agnostic" intrinsic nodes such as ArrayRegionCompareToNode. These intrinsics may work with fixed strides of 1, 2 or 4 bytes per element, or with a dynamic parameter containing the stride in log2 format, i.e. 0 -> 1 byte, 1 -> 2 byte, 2 -> 4 byte. If an intrinsic method has two array parameters with potentially different strides, both log2 stride values are encoded into one as follows: (strideA * N_STRIDES) + strideB. This value is used inside the intrinsic as a jump table index to dispatch to separately compiled versions for each possible combination of strides.

Constructor Summary

Constructors

Constructor and Description
NodeStrideUtil()

Method Summary

Modifier and Type	Method and Description
static JavaKind	getConstantStrideA(ValueNode dynamicStrides, JavaKind strideA) If the constant stride parameter strideA is non-null, return it.
static JavaKind	getConstantStrideB(ValueNode dynamicStrides, JavaKind strideB) If the constant stride parameter strideB is non-null, return it.
static int	getDirectStubCallIndex(ValueNode dynamicStrides, JavaKind strideA, JavaKind strideB) If the constant stride parameters strideA and strideB are non-null, construct a direct stub call index from them.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NodeStrideUtil

public NodeStrideUtil()

Method Detail

getConstantStrideA

public static JavaKind getConstantStrideA(ValueNode dynamicStrides,
                                          JavaKind strideA)

If the constant stride parameter strideA is non-null, return it. Otherwise, extract strideA from the constant direct stub call index value dynamicStrides.

getConstantStrideB

public static JavaKind getConstantStrideB(ValueNode dynamicStrides,
                                          JavaKind strideB)

If the constant stride parameter strideB is non-null, return it. Otherwise, extract strideB from the constant direct stub call index value dynamicStrides.

getDirectStubCallIndex

public static int getDirectStubCallIndex(ValueNode dynamicStrides,
                                         JavaKind strideA,
                                         JavaKind strideB)

If the constant stride parameters strideA and strideB are non-null, construct a direct stub call index from them. Otherwise, return the direct stub call index contained in dynamicStrides, if it is constant. If dynamicStrides is not constant, return -1.