[LLVMdev] Cannot split vector result of AVX intrinsic _mm256_rsqrt_ps

Craig Topper craig.topper at gmail.com
Sat Dec 13 16:49:35 PST 2014

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>
> 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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