[llvm-bugs] [Bug 35730] New: [AMDGPU][MC] Incorrect parsing of flat/global atomic modifiers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35730

            Bug ID: 35730
           Summary: [AMDGPU][MC] Incorrect parsing of flat/global atomic
                    modifiers
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedbugs at nondot.org
          Reporter: dpreobrazhensky at luxoft.com
                CC: llvm-bugs at lists.llvm.org

flat/global atomic modifiers are parsed incorrectly. As a result, some valid
combinations of modifiers are not accepted.

An example of a failed test:

    flat_atomic_cmpswap v0, v[1:2], v[2:3] glc slc

The reason for this failure is that current design assumes that all operands
after first optional operand are also optional. However implementation of
flat/global atomic instructions breaks this rule: 'glc' is a mandatory modifier
which follows an optional 'offset'.

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