LoweringProvider

All Known Subinterfaces:

AArch64LoweringProviderMixin, AMD64LoweringProviderMixin, HotSpotLoweringProvider

All Known Implementing Classes:

AArch64HotSpotLoweringProvider, AMD64HotSpotLoweringProvider, DefaultHotSpotLoweringProvider, DefaultJavaLoweringProvider
```
public interface LoweringProvider
```
Provides a capability for replacing a higher node with one or more lower level nodes.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`boolean`	`divisionOverflowIsJVMSCompliant()` Indicates whether the target platform complies with the JVM specification semantics for `idiv` and `ldiv` when the dividend is `Integer.MAX_VALUE` or `Long.MAX_VALUE` respectively and the divisor is `-1`.
`TargetDescription`	`getTarget()` Returns the target being lowered.
`void`	`lower(Node n, LoweringTool tool)`
`boolean`	`narrowsUseCastValue()` Indicates whether this target platform supports uses `CastValue` for narrows.
`ValueNode`	`reconstructArrayIndex(JavaKind elementKind, AddressNode address)` Reconstructs the array index from an address node that was created as a lowering of an indexed access to an array.
`Integer`	`smallestCompareWidth()` Indicates the smallest width for comparing an integer value on the target platform.
`boolean`	`supportsBulkZeroing()` Indicates whether this target platform supports bulk zeroing of arbitrary size.
`boolean`	`supportsFoldingExtendIntoAccess(ExtendableMemoryAccess access, MemoryExtendKind extendKind)` Indicates whether this target platform can fold an `extendKind` into a given `ExtendableMemoryAccess`.
`boolean`	`supportsImplicitNullChecks()` Indicates whether this target platform supports the usage of implicit (trapping) null checks.
`boolean`	`supportsOptimizedFilling(OptionValues options)` Indicates whether this target platform supports optimized filling of memory regions with `long` values.
`boolean`	`supportsRounding()` Indicates whether this target platform supports lowering `RoundNode`.
`boolean`	`writesStronglyOrdered()` Indicates whether all writes are ordered on this target platform.

- Method Detail
  - lower
```
void lower(Node n,
           LoweringTool tool)
```
  - reconstructArrayIndex
```
ValueNode reconstructArrayIndex(JavaKind elementKind,
                                AddressNode address)
```
    Reconstructs the array index from an address node that was created as a lowering of an indexed access to an array.
    
    Parameters:
    
    elementKind - the JavaKind of the array elements
    
    address - an AddressNode pointing to an element in an array
    
    Returns:
    
    a node that gives the index of the element
  - smallestCompareWidth
```
Integer smallestCompareWidth()
```
    Indicates the smallest width for comparing an integer value on the target platform.
  - supportsBulkZeroing
```
boolean supportsBulkZeroing()
```
    Indicates whether this target platform supports bulk zeroing of arbitrary size.
  - supportsOptimizedFilling
```
boolean supportsOptimizedFilling(OptionValues options)
```
    Indicates whether this target platform supports optimized filling of memory regions with long values.
  - supportsRounding
```
boolean supportsRounding()
```
    Indicates whether this target platform supports lowering RoundNode.
  - supportsImplicitNullChecks
```
boolean supportsImplicitNullChecks()
```
    Indicates whether this target platform supports the usage of implicit (trapping) null checks.
  - writesStronglyOrdered
```
boolean writesStronglyOrdered()
```
    Indicates whether all writes are ordered on this target platform.
  - getTarget
```
TargetDescription getTarget()
```
    Returns the target being lowered.
  - divisionOverflowIsJVMSCompliant
```
boolean divisionOverflowIsJVMSCompliant()
```
    Indicates whether the target platform complies with the JVM specification semantics for idiv and ldiv when the dividend is Integer.MAX_VALUE or Long.MAX_VALUE respectively and the divisor is -1. The specified result for this case is the dividend.
  - narrowsUseCastValue
```
boolean narrowsUseCastValue()
```
    Indicates whether this target platform supports uses CastValue for narrows.
  - supportsFoldingExtendIntoAccess
```
boolean supportsFoldingExtendIntoAccess(ExtendableMemoryAccess access,
                                        MemoryExtendKind extendKind)
```
    Indicates whether this target platform can fold an extendKind into a given ExtendableMemoryAccess.

Interface LoweringProvider

Method Summary

Method Detail

lower

reconstructArrayIndex

smallestCompareWidth

supportsBulkZeroing

supportsOptimizedFilling

supportsRounding

supportsImplicitNullChecks

writesStronglyOrdered

getTarget

divisionOverflowIsJVMSCompliant

narrowsUseCastValue

supportsFoldingExtendIntoAccess