yihanaa added inline comments.
================
Comment at: clang/lib/CodeGen/CGBuiltin.cpp:2048
+ QualType Type) {
+ static llvm::DenseMap<QualType, StringRef> Types;
if (Types.empty()) {
----------------
erichkeane wrote:
> yihanaa wrote:
> > erichkeane wrote:
> > > yihanaa wrote:
> > > > erichkeane wrote:
> > > > > Instead of this initialization, can we make this a constexpr
> > > > > constructor/collection of some sort and instantiate it inline?
> > > > > Instead of this initialization, can we make this a constexpr
> > > > > constructor/collection of some sort and instantiate it inline?
> > > >
> > > > I don't have a good idea because it relies on Context to get some types
> > > > like const char *
> > > We could at minimum do a in inline-initializer instead of the branch
> > > below.
> > I still haven't come up with a good idea to do it๐
> Hrmph, `DenseMap` doesn't seem to have an init list ctor?!
>
> Since this is a finite, known at compile time list of low 'N', I'd suggest
> just making it `static std::array<pair<QualType, StringRef>> Types =
> {{Context.CharTy, "%c"},...`.
>
> Then just doing a llvm::find_if. The list is small enough I suspect the
> DenseMap overhead is more than the use of `llvm::find_if`.
Haha,DenseMap also has no constexpr ctor. I think the time complexity of these
two is the same.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D122822/new/
https://reviews.llvm.org/D122822
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