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ORC: prepare for another patent-pending optimization (#15996)

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* ORC: prepare for another patent-pending optimization

* bugfix

* '=copy' for refs can take a cyclic parameter for more ORC optimizations

* ORC: exploit the common 'it = it.next' pattern

* can't hurt to check for nil

* use an algorithm that is not obviously broken

* restore the test case

* final cleanups for --gc:orc
This commit is contained in:
Andreas Rumpf 2020-11-18 22:31:06 +01:00 • committed by GitHub
commit b9eb91cbb5
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7 changed files with 147 additions and 39 deletions
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17
lib/system/arc.nim
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@ -75,6 +75,8 @@ when defined(nimArcDebug):
elif defined(nimArcIds):
var gRefId: int
const traceId = -1
proc nimNewObj(size, alignment: int): pointer {.compilerRtl.} =
let hdrSize = align(sizeof(RefHeader), alignment)
let s = size + hdrSize
@ -126,13 +128,14 @@ proc nimIncRef(p: pointer) {.compilerRtl, inl.} =
when traceCollector:
cprintf("[INCREF] %p\n", head(p))
proc unsureAsgnRef(dest: ptr pointer, src: pointer) {.inline.} =
# This is only used by the old RTTI mechanism and we know
# that 'dest[]' is nil and needs no destruction. Which is really handy
# as we cannot destroy the object reliably if it's an object of unknown
# compile-time type.
dest[] = src
if src != nil: nimIncRef src
when not defined(gcOrc) or defined(nimThinout):
proc unsureAsgnRef(dest: ptr pointer, src: pointer) {.inline.} =
# This is only used by the old RTTI mechanism and we know
# that 'dest[]' is nil and needs no destruction. Which is really handy
# as we cannot destroy the object reliably if it's an object of unknown
# compile-time type.
dest[] = src
if src != nil: nimIncRef src
when not defined(nimscript) and defined(nimArcDebug):
proc deallocatedRefId*(p: pointer): int =