[LLVMdev] problem with X86's AVX assembler?

[Adam Nemet]

> On Jun 25, 2014, at 7:05 PM, Jun Koi <junkoi2004 at gmail.com> wrote:
> 
> 
> 
> 
>> On Thu, Jun 26, 2014 at 5:47 AM, Adam Nemet <anemet at apple.com> wrote:
>> Hi Jun,
>> 
>> On Jun 25, 2014, at 8:14 AM, Jun Koi <junkoi2004 at gmail.com> wrote:
>> 
>> > Hi,
>> >
>> > I am trying to assemble below instruction with latest LLVM code, but fail. Am I doing something wrong, or is this a bug?
>> >
>> >
>> > $ echo "vaddps zmm7 {k6}, zmm2, zmm4, {rd-sae}"|./Release+Asserts/bin/llvm-mc -assemble -triple=x86_64 -mcpu=knl -show-encoding -x86-asm-syntax=intel
>> >     .text
>> > <stdin>:1:31: error: unknown token in expression
>> > vaddps zmm7 {k6}, zmm2, zmm4, {rd-sae}
>> >                               ^
>> > <stdin>:1:31: error: unknown token in expression
>> > vaddps zmm7 {k6}, zmm2, zmm4, {rd-sae}
>> 
>> Unfortunately, I don’t think sae is supported yet.  (I think the ^ is misplaced; it should point to the {rd-sae}.)
>> 
>> (I may be wrong here but looks like even the X86AsmParser is lacking support for sae even though some instruction in the .td file contain {sae} in their asm syntax.)
> 
> Oh it seems also the disasm support for sae is lacking:
> 
> $ echo "62 f1 6c 1e 58 fc"|./Release+Asserts/bin/llvm-mc -disassemble -triple=x86_64
>     .text
> <stdin>:1:4: error: invalid input token
> 62 f1 6c 1e 58 fc

That's not too surprising; assembler and disassembler support go hand in hand. 

> I hope there is a plan to o support this SAE stuff soon?

Assembler support is in pretty good shape otherwise. I expect that this will be added as soon as someone really needs it. Help is always welcome ;)

Adam

> 
> 
> Thanks,
> Jun
> 
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