[LLVMbugs] [Bug 24319] New: possible lexical analysis or parsing problem with assembly code

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24319

            Bug ID: 24319
           Summary: possible lexical analysis or parsing problem with
                    assembly code
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: Wolfgang_Pieb at playstation.sony.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Given the following assembly source (assemble with clang –c):

        .macro  ROUND   _of,_sc=1
        vpaddd          \_of-4(%rdi,%rax,\_sc), %xmm0, %xmm0
        .endm

        ROUND   16+ 2
        ROUND   16 + 2


The 2 resulting instructions are:

   0:   c5 f9 fe 44 47 0c       vpaddd 0xc(%rdi,%rax,2),%xmm0,%xmm0
   6:   c5 f9 fe 44 07 0e       vpaddd 0xe(%rdi,%rax,1),%xmm0,%xmm0


The first macro invocation seems to be interpreted as ROUND(16, 2), indicating
a possible problem with lexical analysis or parsing.

When assembled with gcc, the 2 macro invocations result in the same
instruction, identical to the instruction at offset 6 in the above example.

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