[LLVMbugs] [Bug 2984] New: Thumb target should use register scavenger

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2984

           Summary: Thumb target should use register scavenger
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: evan.cheng at apple.com
                CC: llvmbugs at cs.uiuc.edu


Currently the Thumb target reserves r3. It is not available for general
register allocation but is only used to materialize stack offsets. See
ARMRegisterInfo.cpp.

We should teach it to use the register scavenger to get a register to
materialize stack offset instead (same as ARM target). This is a critical step
towards making it a first class target.


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