[llvm-dev] [RFC] IRBuilder polymorphism: Templates/virtual (original) (raw)

Nicolai Hähnle via llvm-dev llvm-dev at lists.llvm.org
Tue Feb 11 06:50:04 PST 2020

Nikita posted some performance comparisons on the Phabricator review https://reviews.llvm.org/D73835, results here: https://gist.github.com/nikic/9a87083358d98f34e8e64851a84ff864

It seems like the difference in compile time is in the noise.

Cheers, Nicolai

On Mon, Feb 10, 2020 at 9:35 PM Michael Kruse <llvmdev at meinersbur.de> wrote:

Am Do., 6. Feb. 2020 um 04:07 Uhr schrieb Nicolai Hähnle via llvm-dev <llvm-dev at lists.llvm.org>: > I am in favor of this, for all the reasons you mention. In fact, I was > tempted to do this myself in the past. This is particularly an issue > for external tools that want to leverage LLVM without forking the > upstream, which is a usecase that LLVM should support better. > > Generally, I think LLVM errs too much on the side of monomorphizing > everything, which sounds nice in theory, but the runtime performance > implications are often questionable, and the compile time certainly > suffers. I think we should take some time to think through the details > of this change, but we should make it. +1

-- Lerne, wie die Welt wirklich ist, aber vergiss niemals, wie sie sein sollte.

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