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This MR changes some simple optimizations and is a first step in re-architecting
the JS backend pipeline to add the optimizer. In particular it:
- removes simple peep hole optimizations from `GHC.StgToJS.Printer` and removes that module
- adds module `GHC.JS.Optimizer`
- defines the same peep hole opts that were removed only now they are `Syntax -> Syntax` transformations rather than `Syntax -> JS code` optimizations
- hooks the optimizer into code gen
- adds FuncStat and ForStat constructors to the backend.
Working Ticket:
- #22736
Related MRs:
- MR !10142
- MR !10000
-------------------------
Metric Decrease:
CoOpt_Read
ManyAlternatives
PmSeriesS
PmSeriesT
PmSeriesV
T10421
T12707
T13253
T13253-spj
T15164
T17516
T18140
T18282
T18698a
T18698b
T18923
T1969
T19695
T20049
T3064
T5321FD
T5321Fun
T783
T9198
T9233
T9630
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This commit:
Splits JExpr and JStat into two nearly identical DSLs:
- GHC.JS.Syntax is the JMacro based DSL without unsaturation, i.e., a
value cannot be unsaturated, or, a value of this DSL is a witness that a
value of GHC.JS.Unsat has been saturated
- GHC.JS.Unsat is the JMacro DSL from GHCJS with Unsaturation.
Then all binary and outputable instances are changed to use
GHC.JS.Syntax.
This moves us closer to closing out #22736 and #22352. See #22736 for
roadmap.
-------------------------
Metric Increase:
CoOpt_Read
LargeRecord
ManyAlternatives
PmSeriesS
PmSeriesT
PmSeriesV
T10421
T10858
T11195
T11374
T11822
T12227
T12707
T13035
T13253
T13253-spj
T13379
T14683
T15164
T15703
T16577
T17096
T17516
T17836
T18140
T18282
T18304
T18478
T18698a
T18698b
T18923
T1969
T19695
T20049
T21839c
T3064
T4801
T5321FD
T5321Fun
T5631
T5642
T783
T9198
T9233
T9630
TcPlugin_RewritePerf
WWRec
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Add JS backend adapted from the GHCJS project by Luite Stegeman.
Some features haven't been ported or implemented yet. Tests for these
features have been disabled with an associated gitlab ticket.
Bump array submodule
Work funded by IOG.
Co-authored-by: Jeffrey Young <jeffrey.young@iohk.io>
Co-authored-by: Luite Stegeman <stegeman@gmail.com>
Co-authored-by: Josh Meredith <joshmeredith2008@gmail.com>
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