[llvm-dev] Checking when Register Allocation has been performed
Martin J. O'Riordan via llvm-dev
llvm-dev at lists.llvm.org
Mon Jan 15 13:03:23 PST 2018
Is asking if the MF has the NoVRegs property okay? My clunky hack does something similar I must admit, currently I use ‘bool isPostRA = (MF.getRegInfo().getNumVirtRegs() == 0);’ and your suggestion is semantically very similar, though with a more official stamp :)
All the best,
From: Craig Topper [mailto:craig.topper at gmail.com]
Sent: 15 January 2018 20:26
To: Martin J. O'Riordan <MartinO at theheart.ie>
Cc: LLVM Developers <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Checking when Register Allocation has been performed
On Mon, Jan 15, 2018 at 12:07 PM, Martin J. O'Riordan via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org> > wrote:
Hi LLVM Devs,
I have some shared code that performs lowering operations that can occur before or after register allocation. When it is pre-RA I want to only use virtual registers for intermediate results, but post-RA I have to use only a very restricted set of physical registers.
Code generation using the restricted set is not as efficient as it is when I can use virtual registers. At the moment I have a clunky implementation for checking whether or not the register allocator has been run, and I am wondering if there is a “correct way” of checking whether the RA pass has been run? Some part of the register info API that I have missed perhaps?
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