Re: [PATCH 1/2] sparse, llvm: group PHI nodes at the top of each BB

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Subject: Re: [PATCH 1/2] sparse, llvm: group PHI nodes at the top of each BB
From: Xi Wang <xi.wang@xxxxxxxxx>
Date: Wed, 17 Oct 2012 02:53:48 -0400
Cc: Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>, Jeff Garzik <jgarzik@xxxxxxxxx>, linux-sparse@xxxxxxxxxxxxxxx, Christopher Li <sparse@xxxxxxxxxxx>, Jeff Garzik <jgarzik@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <CAOJsxLFXaWXcR8vF_DFPAaJZPJ_BTe47Q9GSkM-2MChaRBqkdw@mail.gmail.com>
References: <1349825676-1713-1-git-send-email-j.neuschaefer@gmx.net> <5074BD6B.2090501@pobox.com> <CAOJsxLF2AqK2N_R876jOOVmkHXyhe_OjyP_xfULUF5PAfKogMw@mail.gmail.com> <20121010163306.GA2846@debian.debian> <CAOJsxLE=UsuonXVPuDxL9jPGQj_M5xdvCUrk5u+m3U-s4Ao-hA@mail.gmail.com> <CAOJsxLEEBYMF4qcyBSpS7kaumzpQFm0McNexRtft3UJVwp==Xg@mail.gmail.com> <20121016201426.GD2932@debian.debian> <507DC95C.7010106@gmail.com> <CAOJsxLFXaWXcR8vF_DFPAaJZPJ_BTe47Q9GSkM-2MChaRBqkdw@mail.gmail.com>
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On 10/17/12 2:48 AM, Pekka Enberg wrote:
> Is LLVM able to optimize away the allocas and use registers instead in
> the emitted code?

Yes.  See the last part of my previous email, no load/store/alloca after
LLVM's -mem2reg pass.

- xi
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