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[LLVM9+] Use llvm.psub in offset_from #57818

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scottmcm opened this issue Jan 21, 2019 · 3 comments
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[LLVM9+] Use llvm.psub in offset_from #57818

scottmcm opened this issue Jan 21, 2019 · 3 comments

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@scottmcm
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scottmcm commented Jan 21, 2019

Ref http://lists.llvm.org/pipermail/llvm-dev/2019-January/129095.html & https://reviews.llvm.org/D56598

offset_from tracking issue: #41079

Previous discussion about offset_from wanting a different subtraction mode than existed in LLVM at the time: #41079 (comment)

(Hmm, Ralf was CC'd on the llvm-dev mail suggesting this, so I bet this is exactly what we need 🙂)

@nagisa
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nagisa commented Jan 21, 2019

There does not appear to be consensus on the feature yet and I suspect that the instruction/intrinsic will go through many iterations before landing, if at all.

@scottmcm
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Agreed this is not currently actionable, @nagisa. (I should have put that in the op, not just the 9+ in the title.) Feel free to close this for now in you prefer.

@nagisa
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nagisa commented Jan 21, 2019

It seems enough to have a mention of this in the tracking issue. I’m fairly confident we will eventually notice when/if psub actually happens anyway.

Closing.

@nagisa nagisa closed this as completed Jan 21, 2019
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