[LLVMdev] Cannot split vector result of AVX intrinsic _mm256_rsqrt_ps

[Craig Topper]

This sounds like the somehow the frontend is allowing the intrinsic to be
used but the backend thinks it not legal and is trying to split the vector
type to a legal type.

Can you provide your source and command line.

On Sat, Dec 13, 2014 at 2:17 PM, Steven Noonan <steven at uplinklabs.net>
wrote:
>
> I'm getting this on LLVM trunk:
>
> SplitVectorResult #0: 0x27e6250: v8f32 = llvm.x86.avx.rsqrt.ps.256
> 0x2739310, 0x2739420 [ORD=16] [ID=0]
> LLVM ERROR: Do not know how to split the result of this operator!
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> Oddly, when I build the same code without -flto I don't see this issue.
>
> I see a similar bug was reported over a year ago and has had no
> activity (though it doesn't use LTO):
> http://llvm.org/bugs/show_bug.cgi?id=17909
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-- 
~Craig
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