zizhar added a comment.
You understood corectly :)
After going a bit through the log, I think that there is no reason for clang to
not detect it, probably the check was just forgotten.
This patch is the check.
"r" constraint means (taken from the spec:) A register operand is allowed
provided that it is in a general register.
("%rcx") means - use the register rcx.
http://reviews.llvm.org/D15075
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