[llvm-dev] Removing LLVM_ALWAYS_INLINE from ADT classes

Davide Italiano via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 9 14:18:10 PST 2019

On Wed, Jan 9, 2019 at 9:38 AM Mehdi AMINI <joker.eph at gmail.com> wrote:
> On Fri, Jan 4, 2019 at 3:15 PM Davide Italiano via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>> Hi,
>> I would like to propose, based on a previous discussion on llvm-dev,
>> the following change.
>> https://reviews.llvm.org/D56337
>> The main motivation for annotating member functions of ADT clases with
>> LLVM_ALWAYS_INLINE  was that of speeding up `check-llvm` at `-O0`.
>> Turns out this significantly degrades the debuggability of fundamental
>> classes in llvm itself, e.g. StringRef or SmallVector.
> It seems that the issue is not a problem with the inlining these functions but rather that they aren't emitted when inlined and so can't be called from the debugger.
> An alternative that preserves the inlining for the performance aspect *and* still emit them in debug build so that they are available in debug builds would be another macro that would expand to something like __attribute__((used)).

I need to sort out the details, but I like your idea (also, nullifies
some of the raised objections).
I'll try and let you know how it works out.



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