[llvm-bugs] [Bug 27644] New: [MIPS] LA macro expansion limitation for PIC mode

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27644

            Bug ID: 27644
           Summary: [MIPS] LA macro expansion limitation for PIC mode
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-as
          Assignee: unassignedbugs at nondot.org
          Reporter: milko.leporis at imgtec.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

In current version of llvm-as, LA macro is incorrectly expanded when in PIC
mode.


Real life example from Chromium source, sandbox/linux/seccomp-bpf/syscall.cc:


la     $v0, 2f

in PIC mode is expanded to 

lui     v0,0x0
addiu   v0,v0,0

instead of something like:

lw      v0,0(gp)
addiu   v0,v0,96



This issue is a reference for future work.

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