[LLVMbugs] [Bug 19455] New: ARM64 (not AArch64) backend emits several GNU-as incompatible expressions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19455

            Bug ID: 19455
           Summary: ARM64 (not AArch64) backend emits several GNU-as
                    incompatible expressions
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: simon.hosie at arm.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The new ARM64 back-end emits a few things which work internally but aren't
compatible with the GNU assembler.

In particular it passes x-registers rather than w-registers to the uxtw and
sxtw instructions and address operands.

It also emits .loh, and .subsections_via_symbols.  I don't know if these can be
considered bugs if they're necessary for the proper operation of the assembler

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