[LLVMdev] llvm-as regression

[Bagel]

On Fri Jul 24 17:00:52 CDT 2009 Eli Friedman eli.friedman at gmail.com wrote:
 >On Fri, Jul 24, 2009 at 1:21 PM, Bagel<bagel99 at gmail.com> wrote:
 >> The following causes an assertion in recent svn pulls, but not in 2.5.
 >>
 >> The assertion:
 >>
 >> llvm-as: /home/bgl/work/llvm-work/include/llvm/ADT/SmallVector.h:125: T&
 >> llvm::SmallVectorImpl<T>::operator[](unsigned int) [with T = llvm::Constant*]:
 >> Assertion `Begin + idx < End' failed.
 >
 >Fixed in r77005.

Thanks.

 >> The .ll code:
 >>
 >> target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32"
 >> target triple = "x86-unknown-unknown"
 >> @foo = constant [4 x [0 x i8]*] [
 >

Anton Korobeynikov wrote:
 > Hello,
 >
 > I'm awfully sorry - I was pretty busy to include your patches to LLVM
 > mainline but hope to do this during this weekend. Apple folks just
 > released their "alternative" of libgcc. It might be pretty interesting
 > thing for msp430: http://compiler-rt.llvm.org/
 >
 > [0 x i8]* bitcast( [5 x i8]* getelementptr( [5 x i8]* @.str1 )  to [0 x i8]* ),

You're using getelementptr in a slightly strange way here; it isn't
illegal, but LLVM would never generate it because of the constant
folder.

 > I'm not sure how to proceed on tracking down the cause.

gdb is your friend; a backtrace made the issue pretty obvious.

-Eli