[LLVMdev] llc with -march=mips failed to compile va_start()/va_end()/va_arg()

[Eli Friedman]

On Mon, Aug 15, 2011 at 2:18 AM, Leo Chen. <leo.q.chen at gmail.com> wrote:
> Hi,
>
> I am using llc (llvm 2.9) to generate the MIPS assembly

I would suggest trying trunk; there have been a lot of improvements
recently to the MIPS backend.

-Eli

> but failed
> when compile any codes
> with va_start()/va_end()/va_arg().
>
> Here is the minimal step to reproduce the failure:
> llvm-gcc-4.2 -emit-llvm hello.c -c -o hello.bc
> llc -march=mips hello.bc -o hello.s
>
> llc show this erroe message:
> LLVM ERROR: Cannot select: 0xa1873a0: ch = vaend 0xa187290:1,
> 0xa185ae0, 0xa187318 [ID=38]
>  0xa185ae0: i32 = FrameIndex<1> [ORD=3] [ID=10]
>
> I try the same thing on arch x86/ARM like this, and they just work fine:
> llc hello.bc -o hello.s  //x86
> llc -march=arm hello.bc -o hello.s  //ARM
>
> Can anyone tell me whether it's a bug so that I could submit the bug
> on Bugzilla?
> And any suggestion about how to fix this problem is appreciated.
>
> ----------- hello.c --------------------------
> #include <stdio.h>
> #include <stdarg.h>
> void print_msg( const char *fmt, ... )
> {
>    va_list ap;
>    va_start( ap, fmt );
>    vprintf( fmt, ap );
>    va_end( ap );
> }
> int main()
> {
>    print_msg( "hello\n" );
>    return 0;
> }
> -----------------------------------------------
>
>
> Regards,
> Leo
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>