aaron.ballman added a comment.
Generally LGTM, with one question about guarding against overflow.
================
Comment at: lib/Sema/SemaStmtAsm.cpp:447
@@ +446,3 @@
+ // Make sure no more than one input constraint matches each output.
+ if (InputMatchedToOutput[TiedTo] != ~0U) {
+ Diag(NS->getInputExpr(i)->getLocStart(),
----------------
Is it possible for InputConstraintsInfos.size() to be greater than
OutputConstrainInfos.size()? Basically, I'm worried about buffer overflow here
with TiedTo.
http://reviews.llvm.org/D12955
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