[LLVMbugs] [Bug 4609] New: Thumb2 cannot use register index with PC-relative addressing

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4609

           Summary: Thumb2 cannot use register index with PC-relative
                    addressing
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bob.wilson at apple.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3235)
 --> (http://llvm.org/bugs/attachment.cgi?id=3235)
testcase

This bug originates from trying to build darwin-crt3.c for ARMv7 in Thumb mode.
 Compile the attached testcase with:

llc -relocation-model=pic ldr_pc_plus_reg.bc

The compiler does not crash but the assembler complains:

ldr_pc_plus_reg.s:570:cannot use register index with PC-relative addressing --
`ldr r1,[pc,+r1]'

The problem does not occur if you don't specify -relocation-model=pic.


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