[llvm-bugs] [Bug 36928] New: [PPC64] V2 ABI: implement toc restore after calls.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36928

            Bug ID: 36928
           Summary: [PPC64] V2 ABI: implement toc restore after calls.
           Product: lld
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: sfertile at ca.ibm.com
                CC: llvm-bugs at lists.llvm.org

rewriting nops to toc restores works for big-endian, but not little-endian
ppc64.

Calls that cross dso-boundaries will set r2 to the toc pointer for the dso the
callee resides in. The plt stub will save the local toc pointer into the toc
save slot (sp + 24) and the compiler will have inserted a nop after any call
that may not be local. LLD needs to recognize when a call is not local, and
rewrite the nop to a load of the saved toc pointer into r2.

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