[LLVMdev] inline asm constraints in LLVM

John Thompson john.thompson.jtsoftware at gmail.com
Thu Jul 29 11:36:01 PDT 2010

I'm trying to fix the handling of multiple alternate constraints in Clang

How should the constraints be represented in the .ll file?

Clang currently will assert because the code generator sees a constraints
string with the wrong number of comma-separated items.

Basically, after some editing, it just concatenates them together.  The
commas used in the string for a multiple alternative constraint gets
confused with the commas separating the constraints.

Briefly looking at the LLVM asm parser, I can't really see anything that
tells me multiple alternative constraints are supported.

But if they are, please tell me the string format, and perhaps update the
docs to show this.

If they are not yet supported in LLVM, what should I do?


John Thompson
John.Thompson.JTSoftware at gmail.com
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