[llvm-dev] Spare Register at one Machine Instruction

Nemanja Ivanovic via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 19 05:50:46 PST 2017

I believe what you're after is the register scavenger.
It's in: include/llvm/CodeGen/RegisterScavenging.h
Implementation: lib/CodeGen/RegisterScavenging.cpp

On Thu, Jan 19, 2017 at 1:36 PM, Hong Hu via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi All,
> Given a machine instruction, is it possible to tell which register(s) is
> still not in use?
> For example, given one instruction A, if the one follows it (say B)
> defines register rax, then I can tell rax should spare at instruction A.
> The purpose is to use the spare register to replace registers used by A,
> for instrumentation purpose.
> Regards,
> Hu Hong
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> llvm-dev at lists.llvm.org
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