llvm dev - Apr 2015 - [LLVMdev] undefined reference to 'llvm.x86.sse2.sqrt.pd.v2f64'

I used the following way to create an x86_sse2_sqrt_pd intrinsic
instruction:

Value *Approx::CreateVFSqrt(IRBuilder<> &builder, Value *v, const
std::string& Name) {
  Type *tys[] = {v->getType()};
  Module* M = currF->getParent();

  Value* sqrtv = Intrinsic::getDeclaration(M, Intrinsic::x86_sse2_sqrt_pd,
tys);
  Value *CI = builder.CreateCall(sqrtv, v, Name);

  return CI;
}

I can compile it with clang++ and then generate the assembly code with llc.

However, it gives me and error "undefined reference to
'llvm.x86.sse2.sqrt.pd.v2f64'" when I want to generate the
executable with
gcc. BTW, I opened the assembly code and I can see an instruction "calll
llvm.x86.sse2.sqrt.pd.v2f64" in the file. Any hint would be appreciated!

Best,
Zhi
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It's fixed. I can just use intrinsic::sqrt instead of x86_sse_sqrt_pd.

On Thu, Apr 23, 2015 at 10:26 PM, zhi chen <zchenhn at gmail.com> wrote:
> I used the following way to create an x86_sse2_sqrt_pd intrinsic
> instruction:
>
> Value *Approx::CreateVFSqrt(IRBuilder<> &builder, Value *v, const
> std::string& Name) {
>   Type *tys[] = {v->getType()};
>   Module* M = currF->getParent();
>
>   Value* sqrtv = Intrinsic::getDeclaration(M, Intrinsic::x86_sse2_sqrt_pd,
> tys);
>   Value *CI = builder.CreateCall(sqrtv, v, Name);
>
>   return CI;
> }
>
> I can compile it with clang++ and then generate the assembly code with llc.
>
> However, it gives me and error "undefined reference to
> 'llvm.x86.sse2.sqrt.pd.v2f64'" when I want to generate the
executable with
> gcc. BTW, I opened the assembly code and I can see an instruction
"calll
> llvm.x86.sse2.sqrt.pd.v2f64" in the file. Any hint would be
appreciated!
>
> Best,
> Zhi
>
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