[LLVMbugs] [Bug 9978] New: VerifyCoalescing failure on MultiSource/Benchmarks/btAlignedAllocator.cpp on x86_64

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9978

           Summary: VerifyCoalescing failure on
                    MultiSource/Benchmarks/btAlignedAllocator.cpp on
                    x86_64
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: zwarich at apple.com
                CC: llvmbugs at cs.uiuc.edu


Here is a reduction of the failure:

target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-macosx10.7.0"

@_ZL9sFreeFunc = internal unnamed_addr global void ()* @_ZL13btFreeDefaultPv,
align 8

define internal void @_ZL13btFreeDefaultPv() nounwind ssp {
entry:
  ret void
}

define void @_Z21btAlignedFreeInternalPv() ssp {
entry:
  %tmp8 = load void ()** @_ZL9sFreeFunc, align 8
  tail call void %tmp8()
  ret void
}

# Before register coalescing
# Machine code for function _Z21btAlignedFreeInternalPv:

0L    BB#0: derived from LLVM BB %entry
16L        TCRETURNmi64 %RIP, 1, %noreg, <ga:@_ZL9sFreeFunc>, %noreg, 0,
%RSP<imp-use>, ...; mem:LD8[@_ZL9sFreeFunc]

# End machine code for function _Z21btAlignedFreeInternalPv.

*** Bad machine code: Illegal physical register for instruction ***
- function:    _Z21btAlignedFreeInternalPv
- basic block: entry 0x7fdf1202ffa0 (BB#0) [0L;32L)
- instruction: 16L    TCRETURNmi64 %RIP, 1, %noreg, <ga:@_ZL9sFreeFunc>,
%noreg, 0, %RSP<imp-use>, ...; mem:LD8[@_ZL9sFreeFunc]
- operand 0:   %RIP
RIP is not a GR64_TC register.
LLVM ERROR: Found 1 machine code errors.

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