[Vm-dev] VM Maker: VMMaker.oscog- nice.2281.mcz
commits at source.squeak.org
commits at source.squeak.org
Fri Nov 24 10:00:27 UTC 2017
Nicolas Cellier uploaded a new version of VMMaker to project VM Maker:
http://source.squeak.org/VMMaker/VMMaker.oscog- nice.2281.mcz
==================== Summary ====================
Name: VMMaker.oscog- nice.2281
Author: nice
Time: 24 November 2017, 10:59:40.883312 am
UUID: 4beeaee7-567e-1a4b-b0fb-bd95ce302516
Ancestors: VMMaker.oscog-eem.2280
Fix type inference of variable unskew in BitBlt >> copyLoop
unskew is a signed bitShift and must remain signed.
=============== Diff against VMMaker.oscog-eem.2280 ===============
Item was changed:
----- Method: BitBltSimulation>>copyLoop (in category 'inner loop') -----
copyLoop
| prevWord thisWord skewWord halftoneWord mergeWord hInc y unskew skewMask notSkewMask mergeFnwith destWord |
"This version of the inner loop assumes noSource = false."
<inline: false>
<var: #mergeFnwith declareC: 'unsigned int (*mergeFnwith)(unsigned int, unsigned int)'>
<var: #prevWord type: #'unsigned int'>
<var: #thisWord type: #'unsigned int'>
<var: #skewWord type: #'unsigned int'>
<var: #halftoneWord type: #'unsigned int'>
<var: #mergeWord type: #'unsigned int'>
<var: #destWord type: #'unsigned int'>
<var: #skewMask type: #'unsigned int'>
<var: #notSkewMask type: #'unsigned int'>
mergeFnwith := self cCoerce: (opTable at: combinationRule+1) to: 'unsigned int (*)(unsigned int, unsigned int)'.
mergeFnwith. "null ref for compiler"
hInc := hDir*4. "Byte delta"
"degenerate skew fixed for Sparc. 10/20/96 ikp"
skew == -32
+ ifTrue:
+ ["Beware: separate skewMask initialization to avoid bad type inference.
+ Indeed, unskew is a bitShift and MUST remain signed, while skewMask is unsigned"
+ skew := unskew := 0.
+ skewMask := 0]
- ifTrue: [skew := unskew := skewMask := 0]
ifFalse: [skew < 0
ifTrue:
[unskew := skew+32.
skewMask := AllOnes << (0-skew)]
ifFalse:
[skew = 0
ifTrue:
[unskew := 0.
skewMask := AllOnes]
ifFalse:
[unskew := skew-32.
skewMask := AllOnes >> skew]]].
notSkewMask := skewMask bitInvert32.
noHalftone
ifTrue: [halftoneWord := AllOnes. halftoneHeight := 0]
ifFalse: [halftoneWord := self halftoneAt: 0].
y := dy.
1 to: bbH do: "here is the vertical loop"
[ :i |
halftoneHeight > 1 ifTrue: "Otherwise, its always the same"
[halftoneWord := self halftoneAt: y.
y := y + vDir].
preload ifTrue:
["load the 64-bit shifter"
prevWord := self srcLongAt: sourceIndex.
self incSrcIndex: hInc]
ifFalse:
[prevWord := 0].
"Note: the horizontal loop has been expanded into three parts for speed:"
"This first section requires masking of the destination store..."
destMask := mask1.
thisWord := self srcLongAt: sourceIndex. "pick up next word"
self incSrcIndex: hInc.
skewWord := ((prevWord bitAnd: notSkewMask) bitShift: unskew)
bitOr: "32-bit rotate"
((thisWord bitAnd: skewMask) bitShift: skew).
prevWord := thisWord.
destWord := self dstLongAt: destIndex.
mergeWord := self mergeFn: (skewWord bitAnd: halftoneWord) with: destWord.
destWord := (destMask bitAnd: mergeWord) bitOr:
(destWord bitAnd: destMask bitInvert32).
self dstLongAt: destIndex put: destWord.
self incDestIndex: hInc.
"This central horizontal loop requires no store masking"
destMask := AllOnes.
combinationRule = 3
ifTrue: [(skew = 0) & (halftoneWord = AllOnes)
ifTrue:
["Very special inner loop for STORE mode with no skew -- just move words"
hDir = -1
ifTrue: ["Woeful patch: revert to older code for hDir = -1"
2 to: nWords-1 do:
[ :word |
thisWord := self srcLongAt: sourceIndex.
self incSrcIndex: hInc.
self dstLongAt: destIndex put: thisWord.
self incDestIndex: hInc]]
ifFalse: [2 to: nWords-1 do:
[ :word | "Note loop starts with prevWord loaded (due to preload)"
self dstLongAt: destIndex put: prevWord.
self incDestIndex: hInc.
prevWord := self srcLongAt: sourceIndex.
self incSrcIndex: hInc]]]
ifFalse:
["Special inner loop for STORE mode -- no need to call merge"
2 to: nWords-1 do:
[ :word |
thisWord := self srcLongAt: sourceIndex.
self incSrcIndex: hInc.
skewWord := ((prevWord bitAnd: notSkewMask) bitShift: unskew)
bitOr: "32-bit rotate"
((thisWord bitAnd: skewMask) bitShift: skew).
prevWord := thisWord.
self dstLongAt: destIndex put: (skewWord bitAnd: halftoneWord).
self incDestIndex: hInc]]
] ifFalse: [2 to: nWords-1 do: "Normal inner loop does merge:"
[ :word |
thisWord := self srcLongAt: sourceIndex. "pick up next word"
self incSrcIndex: hInc.
skewWord := ((prevWord bitAnd: notSkewMask) bitShift: unskew)
bitOr: "32-bit rotate"
((thisWord bitAnd: skewMask) bitShift: skew).
prevWord := thisWord.
mergeWord := self mergeFn: (skewWord bitAnd: halftoneWord)
with: (self dstLongAt: destIndex).
self dstLongAt: destIndex put: mergeWord.
self incDestIndex: hInc]
].
"This last section, if used, requires masking of the destination store..."
nWords > 1 ifTrue:
[destMask := mask2.
thisWord := self srcLongAt: sourceIndex. "pick up next word"
self incSrcIndex: hInc.
skewWord := ((prevWord bitAnd: notSkewMask) bitShift: unskew)
bitOr: "32-bit rotate"
((thisWord bitAnd: skewMask) bitShift: skew).
destWord := self dstLongAt: destIndex.
mergeWord := self mergeFn: (skewWord bitAnd: halftoneWord) with: destWord.
destWord := (destMask bitAnd: mergeWord) bitOr:
(destWord bitAnd: destMask bitInvert32).
self dstLongAt: destIndex put: destWord.
self incDestIndex: hInc].
self incSrcIndex: sourceDelta.
self incDestIndex: destDelta]!
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