[llvm-dev] How to migrate x86_sse2_psrl_dq after LLVM v3.8?

[Craig Topper via llvm-dev]

We should still parse IR containing that intrinsic and turn into something
equivalent. You can see what that looks like by running it through the opt
binary without running any passes.

If you're trying to generate IR and you used to generate that intrinsic,
you'll need to generate an equivalent shufflevector instruction. You can
find code for that in AutoUpgrade.cpp

On Tue, Jul 25, 2017 at 1:30 AM Leslie Zhai <lesliezhai at llvm.org.cn> wrote:

> Hi LLVM developers,
>
> After Remove int_x86_sse2_psll_dq_bs and int_x86_sse2_psrl_dq_bs
> intrinsics. The builtins aren't used by clang.
> https://reviews.llvm.org/rL229069 there was no
> Intrinsic::x86_sse2_psrl_dq any more, then how to migrate:
>
>
> Function *F =
>              Intrinsic::getDeclaration(TheModule,
> Intrinsic::x86_sse2_psrl_dq);
>          Result =
>              Builder.CreateCall(F, ArrayRef<Value *>(&Ops[0], 2),
> "palignr");
>
>
> And clang v3.9 migrated X86::BI__builtin_ia32_palignr128 like this
>
> https://github.com/llvm-mirror/clang/blob/master/lib/CodeGen/CGBuiltin.cpp#L7629
> just ignored the if (shiftVal < 32) condition?
>
> https://github.com/llvm-mirror/clang/blob/release_33/lib/CodeGen/CGBuiltin.cpp#L2642
>
> Please give me some hint, thanks a lot!
>
> --
> Regards,
> Leslie Zhai - a LLVM developer https://reviews.llvm.org/p/xiangzhai/
>
> --
~Craig
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