[LLVMdev] problem with X86's AVX assembler?

[Jun Koi]

On Thu, Jun 26, 2014 at 10:23 AM, Adam Nemet <anemet at apple.com> wrote:

>
>
> 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 ;)
>
>
Yes, I would love to, but do not know where to fix.

Seems like I need to work on the lib/Target/X86/X86InstrAVX512.td file to
add the missing SAE support?

Thanks,
Jun
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