[LLVMbugs] [Bug 13414] New: splitkit assert: lib/CodeGen/SplitKit.cpp:206: bool llvm::SplitAnalysis::calcLiveBlockInfo(): Assertion `BI.FirstInstr >= Start' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13414

             Bug #: 13414
           Summary: splitkit assert: lib/CodeGen/SplitKit.cpp:206: bool
                    llvm::SplitAnalysis::calcLiveBlockInfo(): Assertion
                    `BI.FirstInstr >= Start' failed.
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8931
  --> http://llvm.org/bugs/attachment.cgi?id=8931
testcase

$ llc -O2 b.ll -disable-fp-elim

llc: SplitKit.cpp:206: bool llvm::SplitAnalysis::calcLiveBlockInfo(): Assertion
`BI.FirstInstr >= Start' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff6ebea75 in *__GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
64      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff6ebea75 in *__GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff6ec25c0 in *__GI_abort () at abort.c:92
#2  0x00007ffff6eb7941 in *__GI___assert_fail (assertion=0x17d5426
"BI.FirstInstr >= Start", 
    file=<optimized out>, line=206, function=0x17dd700 "bool
llvm::SplitAnalysis::calcLiveBlockInfo()")
    at assert.c:81
#3  0x000000000102dff2 in llvm::SplitAnalysis::calcLiveBlockInfo
(this=0x1f949f0) at SplitKit.cpp:206
#4  0x000000000102db74 in llvm::SplitAnalysis::analyzeUses (this=0x1f949f0) at
SplitKit.cpp:149
#5  0x000000000102e676 in llvm::SplitAnalysis::analyze (this=0x1f949f0,
li=0x1fa2d50) at SplitKit.cpp:316
#6  0x0000000000fd8c17 in (anonymous namespace)::RAGreedy::trySplit
(this=0x1f60780, VirtReg=..., 
    Order=..., NewVRegs=...) at RegAllocGreedy.cpp:1662
#7  0x0000000000fd8ff5 in (anonymous namespace)::RAGreedy::selectOrSplit
(this=0x1f60780, VirtReg=..., 
    NewVRegs=...) at RegAllocGreedy.cpp:1729
#8  0x000000000109e4a0 in llvm::RegAllocBase::allocatePhysRegs (this=0x1f607a0)
at RegAllocBase.cpp:105
#9  0x0000000000fd953b in (anonymous namespace)::RAGreedy::runOnMachineFunction
(this=0x1f60780, mf=...)
    at RegAllocGreedy.cpp:1775
#10 0x0000000000f68bf5 in llvm::MachineFunctionPass::runOnFunction
(this=0x1f60780, F=...)
    at MachineFunctionPass.cpp:33
#11 0x0000000001373e71 in llvm::FPPassManager::runOnFunction (this=0x1f52ed0,
F=...)
    at PassManager.cpp:1498
#12 0x0000000001374093 in llvm::FPPassManager::runOnModule (this=0x1f52ed0,
M=...) at PassManager.cpp:1518
#13 0x00000000013743d9 in llvm::MPPassManager::runOnModule (this=0x1f3d570,
M=...) at PassManager.cpp:1572
#14 0x000000000137490d in llvm::PassManagerImpl::run (this=0x1f2f360, M=...) at
PassManager.cpp:1655
#15 0x0000000001374c09 in llvm::PassManager::run (this=0x7fffffffe130, M=...)
at PassManager.cpp:1684
#16 0x000000000078158d in main (argc=4, argv=0x7fffffffe498) at llc.cpp:541
(gdb) frame 3
#3  0x000000000102dff2 in llvm::SplitAnalysis::calcLiveBlockInfo
(this=0x1f949f0) at SplitKit.cpp:206
206           assert(BI.FirstInstr >= Start);
(gdb) p BI.FirstInstr
$1 = {lie = {Value = 33164770}}
(gdb) p Start
$2 = {lie = {Value = 33164896}}

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