[PATCH] D94450: [LegalizeDAG][RISCV][PowerPC][AMDGPU][WebAssembly] Improve expansion of SETONE/SETUEQ on targets without SETO/SETUO.
Bjorn Pettersson via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Jan 14 12:11:01 PST 2021
bjope added inline comments.
================
Comment at: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:3964
assert(!NeedInvert && "Don't know how to invert BR_CC!");
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craig.topper wrote:
> bjope wrote:
> > NeedInvert is not handled here so this assert started to fail for our OOT target.
> >
> > Haven't really investigate it yet. But should the code here support NeedInvert (or one should tell LegalizeSetCCCondCode above that legalization using NeedInvert isn't allowed).
> I think it's not possible to invert it if Tmp4.getNode() is true below. But I think it should be false for the case this patch introduced.
>
> So I think we can move the assert into the if at line 3969. And pick ISD::SETEQ instead of ISD::SETNE on line 3973 if NeedInvert is true.
Right. Thanks!
I'll play around with that tomorrow.
Repository:
rG LLVM Github Monorepo
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https://reviews.llvm.org/D94450/new/
https://reviews.llvm.org/D94450
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