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nrvo shouldn't touch bycopy object[backport:1.2] (#19385)

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fix nim-lang#19342
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flywind 2022-01-14 00:39:17 +08:00 • committed by GitHub
commit 9b9ae8a487
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3 changed files with 31 additions and 1 deletions
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compiler/ccgtypes.nim
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@ -220,7 +220,7 @@ proc isInvalidReturnType(conf: ConfigRef; rettype: PType): bool =
# such a poor programming language.
# We exclude records with refs too. This enhances efficiency and
# is necessary for proper code generation of assignments.
if rettype == nil or getSize(conf, rettype) > conf.target.floatSize*3:
if rettype == nil or (tfByCopy notin rettype.flags and getSize(conf, rettype) > conf.target.floatSize*3):
result = true
else:
case mapType(conf, rettype, skResult)