pengfei added a comment.
> First I did not say "code doesn't make much sense to me". This is copy form
> your description.
Oop, my bad understanding. :)
> both gcc and icc generated code is not making sense to you.
Yes. Unless there's document to specify the behavior clearly.
> So instead, you want clang give error for this when output size greater than
> input size.
Giving error only when output size greater than input size and output type is
not one of the 3 cases in CGStmt.cpp:2480. I.e.: `OutputDomain != AD_Other ||
OutSize <= InSize`. Otherwise, Clang will crash there.
> What about input size greater than output size? It seems the error already
> emit for that case in Sema. Should also handle the same with your case in
> Sema?
Sema emits error when 1) `InputDomain != AD_Other` 2) Output is mentioned and
`OutSize < InSize`. So input size is allow to be greater than output size only
when output is not mentioned. I don't fully understand the code in CGStmt.cpp,
but according to comment in line 2463, it seems only larger output result needs
to be handled.
================
Comment at: clang/lib/Sema/SemaStmtAsm.cpp:670
+ OutputConstraintInfos[TiedTo].allowsRegister() &&
+ (OutputDomain != AD_Other || OutSize <= InSize))
continue;
----------------
jyu2 wrote:
> Why not emit error in here?
Actually, adding this condition will let it fall through and emit error at line
688.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D107141/new/
https://reviews.llvm.org/D107141
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