[LLVMdev] Tracking down the "pred_iterator out of range" assert

[Chandler Carruth]

On Sat, Mar 29, 2008 at 1:09 PM, Nick Lewycky <nicholas at mxc.ca> wrote:

> That's my patch.
>
> Do you have steps to reproduce?


I just reproduced. I took a clean OS X 10.4 / Xcode (stable release i think)
laptop, built llvm w/ the following commands:

$ ./configure --enable-optimized --enable-jit
$ make -j2
$ ./Release/bin/llvm-as < test/CodeGen/X86/loop-hoist.ll -o testcase.bc
$ ./Release/bin/llc testcase.bc
/Users/chandlerc/code/oss/llvm/include/llvm/Support/CFG.h:61: failed
assertion `!It.atEnd() && "pred_iterator out of range!"'
fish: Process 19237, "Release/bin/llc" from job 1, "Release/bin/llvm-as <
test/CodeGen/X86/loop-hoist.ll | Release/bin/llc > /dev/null" terminated by
signal SIGABRT (Abort)

Here is a GDB backtrace. Feel free to ask me for any further information.
(gdb) bt
#0  0x9003d66c in kill ()
#1  0x9010e8cf in raise ()
#2  0x9010d422 in abort ()
#3  0x0054e4aa in __eprintf ()
#4  0x0044ae8e in llvm::isCriticalEdge ()
#5  0x0043d092 in (anonymous namespace)::CodeGenPrepare::OptimizeBlock ()
#6  0x0043dd24 in (anonymous namespace)::CodeGenPrepare::runOnFunction ()
#7  0x004f8163 in llvm::FPPassManager::runOnFunction ()
#8  0x004f874a in llvm::FunctionPassManagerImpl::run ()
#9  0x004f88a5 in llvm::FunctionPassManager::run ()
#10 0x000034da in main ()

-Chandler



>
> Nick
>
> Scott Michel wrote:
> > I've finally been able to get back to a little hacking, and I've tracked
> > down the before/after SVN revision numbers where this assert gets
> triggered:
> >
> > 47988: No assert
> > 47989: Assert gets triggered during 'make check'
> >
> > This bug pops up when building Release from bootstrap on x86 Darwin (Mac
> > OS X 10.4.11) using XCode 2.5's gcc 4.0.1. I've looked at the diffs
> > between the two revision numbers, but didn't get very far. I'll continue
> > to investigate, but I'm sure there are other llvm developers who can
> > find the problem somewhat faster.
> >
> >
> > -scooter
> >
> >
> > ------------------------------------------------------------------------
> >
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>
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