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ARC Analysis in one pass v3 (#17068)

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* Analyse last reads all at once

* Integrate firstWrite analysis

* Small cleanup

* Use sets instead of seqs

* Remove instrTargets

* Reap the benefits

* Implement error diagnostics

* Operate on DFA index for lastRead analysis

* Use mgetOrPut

* Cache alias results

This improves performance by a lot, since many
CFG locations map to a single PNode

* Improve performance

* Improve performance

* Cleanup

* Fix #17025

* Grammar

* Expand testcase
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Clyybber 2021-02-17 14:17:35 +01:00 • committed by GitHub
commit aa3af9e053
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8 changed files with 208 additions and 130 deletions
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tests/arc/topt_no_cursor.nim
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@ -56,7 +56,7 @@ _ = (
blitTmp, ";")
lvalue = _[0]
lnext = _[1]
`=sink`(result.value, move lvalue)
result.value = move lvalue
`=destroy`(lnext)
`=destroy_1`(lvalue)
-- end of expandArc ------------------------