[LLVMdev] alpha assembler with llc

[Ankit Sethia]

Hi,

If i pass the following option to llc
-nozero-initialized-in-bss

things work out fine.

Thanks,

On Sat, Jun 11, 2011 at 3:17 PM, Ankit Sethia <asethia at eecs.umich.edu>wrote:

> Hi,
>
> I configure llvm to generate code for alpha. I use a the following steps to
> generate code from the source files:
> 1) llvm-gcc -c main.c -emit-llvm main.bc
> 2) opt -load <library fo myPass> -myPass main.bc main.opt.bc
> 3) llc -march=alpha main.opt.bc -o main.S
> 4) alphaev67-unknown-linux-gnu-as main.S -o main.o
>
> Most of the files that i compile run just fine. Suddenly, i have hit on a
> file where Step 4 generates the  following error:
> main.S:1794: Error: unknown pseudo-op: `.bss'
>
> If i just use the alphaev67-unknown-linux-gnu-gcc all the files compile
> just fine. Only when i try to use the 4 steps then  i come across this error
> for 1 file.
>
> Is it a version mismatch between llc assmebly and alpha assembler? How
> should i go about debugging this? The errors also persist if i remove step
> 2.
>
> The difference in error region in  llc generated alpha assembly and the
> corresponding alpha cross compiler gcc genertated assembly is as follow:
> llc generates:
>    .type fetch_ext_rgba_dxt1, at object # @fetch_ext_rgba_dxt1
>    .bss
>    .globl  fetch_ext_rgba_dxt1
>    .align  3
>  fetch_ext_rgba_dxt1:
>    .quad 0
>    .size fetch_ext_rgba_dxt1, 8
>
> alpha-gcc generates:
>    .zero 8
>    .globl fetch_ext_rgba_dxt1
>
>    .type fetch_ext_rgba_dxt1, @object
>
>    .size fetch_ext_rgba_dxt1, 8
>
>    .align 3
>  fetch_ext_rgba_dxt1:
>
> Let me know if any other information is required.
>
>
> --
> Ankit
>



-- 
Ankit
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