[llvm-dev] Textual IR value names

Craig Topper via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 9 14:41:21 PST 2019

The names are dropped to save memory when a release build of the compiler
is being used. This is what you probably want on a release compiler you
intend to ship since it should be faster. The NDEBUG check is an easy way
to tell the difference between release and debug builds. People probably
don't want to have to remember to set an additional cmake option to make a
release compiler faster.

The -fdiscard-value-names/-fno-discard-value-names was added about a year
ago https://reviews.llvm.org/D42887  not sure if there is more discussion
about the asserts behavior discussed there.


On Wed, Jan 9, 2019 at 2:25 PM David Greene <dag at cray.com> wrote:

> Craig Topper via llvm-dev <llvm-dev at lists.llvm.org> writes:
> > And the clang behavior can be controlled with -
> > fdiscard-value-names/-fno-discard-value-names
> That's a little better for users, but again, why should the default
> behavior change based on whether or not asserts are enabled?
>                           -David
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