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Spur64BitMMLECoSimulatorFor64Bits.class.st
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Spur64BitMMLECoSimulatorFor64Bits.class.st
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Class {
#name : #Spur64BitMMLECoSimulatorFor64Bits,
#superclass : #Spur64BitMMLECoSimulator,
#category : #'VMMaker-SpurMemoryManagerSimulation'
}
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> byteAt: byteAddress [
| lowBits long64 |
lowBits := byteAddress bitAnd: 7.
long64 := self long64At: byteAddress - lowBits.
^(long64 bitShift: -8 * lowBits) bitAnd: 16rFF
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> byteAt: byteAddress put: byte [
| lowBits long64 longAddress mask value |
lowBits := byteAddress bitAnd: 7.
longAddress := byteAddress - lowBits.
long64 := self long64At: longAddress.
mask := (16rFF bitShift: 8 * lowBits) bitInvert.
value := byte bitShift: 8 * lowBits.
self long64At: longAddress put: ((long64 bitAnd: mask) bitOr: value).
^byte
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> long32At: byteAddress [
"Answer the 32-bit word at byteAddress which must be a multiple of four."
| lowBits long |
lowBits := byteAddress bitAnd: 4.
long := self long64At: byteAddress - lowBits.
^lowBits = 4
ifTrue: [long bitShift: -32]
ifFalse: [long bitAnd: 16rFFFFFFFF]
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> long32At: byteAddress put: a32BitValue [
"Store the 32-bit word at byteAddress which must be a multiple of four."
| lowBits long longAddress |
lowBits := byteAddress bitAnd: 4.
lowBits = 0
ifTrue: "storing into LS word"
[long := self long64At: byteAddress.
self long64At: byteAddress
put: ((long bitAnd: 16rFFFFFFFF00000000) bitOr: a32BitValue)]
ifFalse: "storing into MS word"
[longAddress := byteAddress - 4.
long := self long64At: longAddress.
self long64At: longAddress
put: ((long bitAnd: 16rFFFFFFFF) bitOr: (a32BitValue bitShift: 32))].
^a32BitValue
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> long64At: byteAddress [
"memory is a DoubleWordArray, a 64-bit indexable array of bits"
byteAddress \\ 8 ~= 0 ifTrue: [self unalignedAccessError].
^memory at: byteAddress // 8 + 1
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> long64At: byteAddress put: a64BitValue [
"memory is a DoubleWordArray, a 64-bit indexable array of bits"
byteAddress \\ 8 ~= 0 ifTrue: [self unalignedAccessError].
^memory at: byteAddress // 8 + 1 put: a64BitValue
]
{ #category : #simulation }
Spur64BitMMLECoSimulatorFor64Bits >> memoryClass [
"Answer the class to use for the memory inst var in simulation.
Answer nil if a suitable class isn't available. This version uses a 64-bit element class if available."
<doNotGenerate>
^Smalltalk classNamed: #DoubleWordArray
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> shortAt: byteAddress [
| lowBits long64 |
lowBits := byteAddress bitAnd: 6.
long64 := self long64At: byteAddress - lowBits.
^(long64 bitShift: -8 * lowBits) bitAnd: 16rFFFF
]
{ #category : #'memory access' }
Spur64BitMMLECoSimulatorFor64Bits >> shortAt: byteAddress put: short [
| lowBits long64 longAddress mask value |
lowBits := byteAddress bitAnd: 6.
longAddress := byteAddress - lowBits.
long64 := self long64At: longAddress.
mask := (16rFFFF bitShift: 8 * lowBits) bitInvert.
value := short bitShift: 8 * lowBits.
self long64At: longAddress put: ((long64 bitAnd: mask) bitOr: value).
^short
]