[llvm-dev] llc error

[Michael Kuperstein via llvm-dev]

Hi Charith,

Which version of LLVM are you using? I haven't tried this, but a similar
error was fixed in in r279735.

Thanks,
  Michael

On 2 September 2016 at 22:53, Charith Mendis via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
> Hi all,
>
> The attached LLVM assembly file fails to generate x86 code when compiled
> using llc.
>
> compilation command - ../llvm-build/bin/llc -filetype=asm -march=x86-64
> -mcpu=core-avx2 ex4.ll
>
> The error message is,
>
> LLVM ERROR: Cannot select: t95: v8f32 = X86ISD::SUBV_BROADCAST t17
>   t17: v4f32,ch = load<LD16[%scevgep](tbaa=<0x4dbcd98>)> t0, t16,
> undef:i64
>     t16: i64 = add t2, Constant:i64<16>
>       t2: i64,ch = CopyFromReg t0, Register:i64 %vreg5
>         t1: i64 = Register %vreg5
>       t15: i64 = Constant<16>
>     t4: i64 = undef
> In function: _ZN10soundtouch12TDStretchSSE13calcCrossCorrEPKfS2_Rd
>
>
> I dug into the LLVM assembly file and found out that the error is caused
> by the following 2 lines (Line 89 and 90).
>
> %8 = shufflevector <4 x float> %6, <4 x float> %6, <8 x i32> <i32 0, i32
> 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
>   %9 = shufflevector <4 x float> %6, <4 x float> %7, <8 x i32> <i32 0, i32
> 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
>
> Could anyone help me understand what this error is?
>
> Your help will be highly appreciated.
>
> --
> Kind regards,
> Charith Mendis
>
>
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