[LLVMbugs] [Bug 1814] New: indvars crash on vector subtract

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1814

           Summary: indvars crash on vector subtract
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Loop Optimizer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1257)
 --> (http://llvm.org/bugs/attachment.cgi?id=1257)
testcase

This bitcode file crashes -indvars. Here's the stack:

opt: /home/nicholas/llvm-commit/include/llvm/Support/Casting.h:199: typename
llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X =
llvm::IntegerType, Y = const llvm::Type*]: Assertion `isa<X>(Val) &&
"cast<Ty>() argument of incompatible type!"' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xf7c9d6c0 (LWP 16580)]
0xffffe405 in __kernel_vsyscall ()
(gdb) bt
#0  0xffffe405 in __kernel_vsyscall ()
#1  0xf7cc97f5 in raise () from /lib/i686/cmov/libc.so.6
#2  0xf7ccb181 in abort () from /lib/i686/cmov/libc.so.6
#3  0xf7cc2b6e in __assert_fail () from /lib/i686/cmov/libc.so.6
#4  0x0833c6b6 in llvm::cast<llvm::IntegerType, llvm::Type const*> (
    Val=@0xffaad940)
    at /home/nicholas/llvm-commit/include/llvm/Support/Casting.h:199
#5  0x085221a6 in llvm::ConstantInt::get (Ty=0x86ca390, 
    V=18446744073709551615, isSigned=false) at Constants.cpp:223
#6  0x084bf97b in llvm::ScalarEvolution::getIntegerSCEV (this=0x86ca028, 
    Val=-1, Ty=0x86ca390) at ScalarEvolution.cpp:513
#7  0x084c2cce in llvm::ScalarEvolution::getNegativeSCEV (this=0x86ca028, 
    V=@0xffaada50) at ScalarEvolution.cpp:538
#8  0x084c2f3e in llvm::ScalarEvolution::getMinusSCEV (this=0x86ca028, 
    LHS=@0xffaada54, RHS=@0xffaada50) at ScalarEvolution.cpp:546
#9  0x084c390d in createSCEV (this=0x86cdaf0, V=0x86cb1a8)
    at ScalarEvolution.cpp:1531
#10 0x084c4051 in getSCEV (this=0x86cdaf0, V=0x86cb1a8)
    at ScalarEvolution.cpp:1325
#11 0x084c7287 in getSCEVAtScope (this=0x86cdaf0, V=0x86ce020, L=0x0)
    at ScalarEvolution.cpp:2129
#12 0x084c7d01 in llvm::ScalarEvolution::getSCEVAtScope (this=0x86ca028, 
    V=0x86cb1f8, L=0x0) at ScalarEvolution.cpp:2672
#13 0x0837d0dd in RewriteLoopExitValues (this=0x86cb288, L=0x86cd8e8)
    at IndVarSimplify.cpp:376
#14 0x0837d4a4 in runOnLoop (this=0x86cb288, L=0x86cd8e8, LPM=@0x86c9f58)
    at IndVarSimplify.cpp:461
#15 0x084ac1b3 in llvm::LPPassManager::runOnFunction (this=0x86c9f58, 
    F=@0x86ca4c8) at LoopPass.cpp:225
#16 0x0856a14a in llvm::FPPassManager::runOnFunction (this=0x86c9ad0, 
    F=@0x86ca4c8) at PassManager.cpp:1171
#17 0x0856a2ec in llvm::FPPassManager::runOnModule (this=0x86c9ad0, 
    M=@0x86c9870) at PassManager.cpp:1191
#18 0x08569e20 in llvm::MPPassManager::runOnModule (this=0x86cb2f8, 
    M=@0x86c9870) at PassManager.cpp:1240
#19 0x08569fd8 in llvm::PassManagerImpl::run (this=0x86caec0, M=@0x86c9870)
    at PassManager.cpp:1313
#20 0x0856a02a in llvm::PassManager::run (this=0xffaae1c8, M=@0x86c9870)
    at PassManager.cpp:1345
#21 0x082dfde3 in main (argc=3, argv=0xffaae3c4) at opt.cpp:427
(gdb) up 9
#9  0x084c390d in createSCEV (this=0x86cdaf0, V=0x86cb1a8)
    at ScalarEvolution.cpp:1531
1531                                 getSCEV(I->getOperand(1)));
(gdb) p V->dump()
        sub <4 x i16> zeroinitializer, zeroinitializer          ; <<4 x
i16>>:22 [#uses=1]

$1 = void


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