[LLVMbugs] [Bug 13145] New: Naming a function like a register name confuses the asm parser

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13145

             Bug #: 13145
           Summary: Naming a function like a register name confuses the
                    asm parser
           Product: libraries
           Version: 3.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: stefan at stefant.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8727
  --> http://llvm.org/bugs/attachment.cgi?id=8727
Testcase for invalid label name due to function name on ARM and MBlaze

Having a function named like 'r3' in the C code will cause LLC to emit a label
called 'r3:' in the assembly file for ARM, and a call like this: 'bl r3'.
Parsing the code using llvm-mc causes an error because it tries to match r3 as
register instead of as a label.

I attached a simple test case, here is how to reproduce the error:

clang -O0 -target arm -o test.s -S test.c
llvm-mc -arch=arm  -filetype=obj -assemble -o test.o test.s

I do not know if the ARM assembler syntax has different mnemonics for all
immediate and register operand instruction versions. In that case it would be
necessary to parse the operand depending on the mnemonic, otherwise the syntax
is simply ambiguous.

The same problem also exists in the MBlaze backend btw.

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