[LLVMbugs] [Bug 4927] New: assertion "no allocatable register" breaks Apple-style llvm-gcc build

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4927

           Summary: assertion "no allocatable register" breaks Apple-style
                    llvm-gcc build
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bob.wilson at apple.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3473)
 --> (http://llvm.org/bugs/attachment.cgi?id=3473)
testcase

Apple-style builds of llvm-gcc are broken on llvm trunk if you include ARM
support.  I'm getting an assertion failure when using the x86 llvm-gcc to build
the arm llvm-gcc.  It seems to happen only with fast isel.  To reproduce,
compile the attached testcase with "llc -O0":

Assertion failed: (I != E && "No allocatable register in this register
class!"), function getFreePhysReg, file
/Volumes/LocalHD/bwilson/llvm/build/llvmCore.roots/llvmCore~obj/src/lib/CodeGen/RegAllocLinearScan.cpp,
line 1362.
0   llc               0x00900fa4 PrintStackTrace(void*) + 45
1   llc               0x009015ac SignalHandler(int) + 410
2   libSystem.B.dylib 0x98115bfb _sigtramp + 43
3   libSystem.B.dylib 0xffffffff _sigtramp + 1743692847
4   libSystem.B.dylib 0x981a3ba5 raise + 26
5   libSystem.B.dylib 0x981b9c5c abort + 93
6   libSystem.B.dylib 0x981a6804 __pthread_markcancel + 0
7   llc               0x0067d725 (anonymous
namespace)::RALinScan::getFreePhysReg(llvm::LiveInterval*,
llvm::TargetRegisterClass const*, unsigned int, llvm::SmallVector<unsigned int,
256u>&, bool) + 335
8   llc               0x0067e80d (anonymous
namespace)::RALinScan::getFreePhysReg(llvm::LiveInterval*) + 1073
9   llc               0x00680860 (anonymous
namespace)::RALinScan::assignRegOrStackSlotAtInterval(llvm::LiveInterval*) +
1928
10  llc               0x006834b1 (anonymous namespace)::RALinScan::linearScan()
+ 667
11  llc               0x00683d99 (anonymous
namespace)::RALinScan::runOnMachineFunction(llvm::MachineFunction&) + 523
12  llc               0x00642737
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 77
13  llc               0x0087f8d7
llvm::FPPassManager::runOnFunction(llvm::Function&) + 297
14  llc               0x0087fe0a
llvm::FunctionPassManagerImpl::run(llvm::Function&) + 112
15  llc               0x0087ffd6
llvm::FunctionPassManager::run(llvm::Function&) + 130
16  llc               0x0002b134 main + 3395
17  llc               0x00029c85 start + 53


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