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VM: optimize 'return' slots; saves millions of node allocations for N… (#25266)

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This commit is contained in:
Andreas Rumpf
2025-11-07 11:05:13 +01:00
committed by GitHub
parent 6f73094263
commit 809662a228
1 changed files with 10 additions and 2 deletions
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12
compiler/vm.nim
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@@ -1442,8 +1442,16 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
#echo "new pc ", newPc, " calling: ", prc.name.s
var newFrame = PStackFrame(prc: prc, comesFrom: pc, next: tos)
newSeq(newFrame.slots, prc.offset+ord(isClosure))
if not isEmptyType(prc.typ.returnType):
putIntoReg(newFrame.slots[0], getNullValue(c, prc.typ.returnType, prc.info, c.config))
# setup slot for proc result:
let ret {.cursor.} = prc.typ.returnType
# hot spot ahead!
if ret != nil:
if fitsRegister(ret):
# same logic as opcLdNullReg here:
ensureKind(newFrame.slots[0], rkInt)
newFrame.slots[0].intVal = 0
elif not isEmptyType(ret):
putIntoReg(newFrame.slots[0], getNullValue(c, ret, prc.info, c.config))
for i in 1..rc-1:
newFrame.slots[i] = regs[rb+i]
if isClosure: