[llvm-bugs] [Bug 39556] New: powerpc port lacks -mmultiple / -mno-multiple

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Nov 4 22:19:53 PST 2018


            Bug ID: 39556
           Summary: powerpc port lacks -mmultiple / -mno-multiple
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: joel at jms.id.au
                CC: llvm-bugs at lists.llvm.org

When compiling the Linux kernel, ppc32be platforms will enable the -mmutliple
flag. From the GCC man page:

    Generate code that uses (does not use) the load multiple word instructions
    the store multiple word instructions.  These instructions are generated by
    default on POWER systems, and not generated on PowerPC systems.  Do not use
    -mmultiple on little-endian PowerPC systems, since those instructions do
not work
    when the processor is in little-endian mode.  The exceptions are PPC740 and
    PPC750 which permit these instructions in little-endian mode.

For feature parity it would be good if Clang supported this option.

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