[PATCH] D14222: [CodeGenPrepare] Don't call getSubtargetImpl quite as often

[David Blaikie via llvm-commits]

+echristo, who did a bunch of this subtarget stuff, in case he has some
extra insight (and/or just so he knows in case other similar things come up)

On Sun, Nov 1, 2015 at 9:57 PM, Keno Fischer via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> loladiro created this revision.
> loladiro added a subscriber: llvm-commits.
> loladiro set the repository for this revision to rL LLVM.
>
> While profiling LLVM's memory allocation, I noticed that getSubtargetImpl
> was called quite often (and it allocates heap memory by doing string
> operations). This simple change to cache the
> TargetLowering/TargetRegisterInfo in CodeGenPrepare reduces the total
> number of allocations in my test compile by about 3%
>
> Repository:
>   rL LLVM
>
> http://reviews.llvm.org/D14222
>
> Files:
>   lib/CodeGen/CodeGenPrepare.cpp
>
>
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