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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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4
compiler/ccgcalls.nim
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@ -298,11 +298,11 @@ proc genArgNoParam(p: BProc, n: PNode, needsTmp = false): Rope =
initLocExprSingleUse(p, n, a)
result = rdLoc(withTmpIfNeeded(p, a, needsTmp))
from dfa import instrTargets, InstrTargetKind
from dfa import aliases, AliasKind
proc potentialAlias(n: PNode, potentialWrites: seq[PNode]): bool =
for p in potentialWrites:
if instrTargets(p, n) != None:
if p.aliases(n) != no or n.aliases(p) != no:
return true
proc skipTrivialIndirections(n: PNode): PNode =