vitalybuka marked an inline comment as done.
vitalybuka added inline comments.
================
Comment at: clang/lib/CodeGen/CGDecl.cpp:873
return true;
- if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
+ if (BWInit || isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
----------------
vitalybuka wrote:
> jfb wrote:
> > I'm not sure I understand what this bit does. If something isn't a bytewise
> > value then we now automatically assume it can be stored to with a single
> > store. That's not necessarily true. I think you need to drop `BWInit ||`
> > from here, and conditionalize this entire branch with `if (BWInit)` instead
> > (so, an `&&` on it all).
> If value is bytewise, we will emit BWInit
>> If value is bytewise, we will emit BWInit
If value is bytewise, we will emit memset, which we can count as one store.
It's not always true that memset costs as a single store. However this is a
heuristic, as the limit 6 itself.
Here I try to keep behavior close to original for zeroes.
In future patches I'd like to try to remove this function and use just
"density" ((count memset bytes that match initializer)/(full size of
initializer)). This will be simpler, should work good enough for exiting cases,
and cover new cases with large initializers where 6 is not enough,
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D64382/new/
https://reviews.llvm.org/D64382
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