[PATCH] D26420: Encode duplication factor from loop vectorization and loop unrolling to discriminator.

Dehao Chen via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Wed Feb 1 16:53:26 PST 2017

danielcdh marked an inline comment as done.
danielcdh added inline comments.

Comment at: lib/Transforms/Utils/AddDiscriminators.cpp:100
+cl::opt<bool> EncodeDuplicationInDiscriminators(
+    "encode-duplication-in-discriminators", cl::init(false),
hfinkel wrote:
> danielcdh wrote:
> > hfinkel wrote:
> > > danielcdh wrote:
> > > > hfinkel wrote:
> > > > > I'm assuming that this is for testing, correct? We'll need to add a function attribute to really control this.
> > > > This is for testing purpose, and will be "true" by default when -fdebug-info-profiling is set.
> > > > 
> > > > I'm not sure why would we need this as a function attribute. I would suppose all binaries built with this on or off. Or am I missing something?
> > > Because we shouldn't use command-line options to communicate between the frontend and the backend. Some legacy aside, this is the strongly-preferred mechanism. It is also necessary for this to work correctly with LTO.
> > How about using TargetOption.DebugInfoForProfiling to decide, as we check it in lib/CodeGen/AsmPrinter/DwarfDebug.cpp?
> I believe that's deprecated too (because it also does not work with LTO). @echristo , can you comment on this (i.e. do we need to use a function-attribute here)?
Removed the flag and checks CompileUnit flag (debugInfoForProfiling) to decided if we want to encode or not.


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