[LLVMdev] Sparse propagation framework

[Bill Wendling]

On Wed, May 27, 2009 at 5:26 PM, Mark Lacey <superoptimizer at gmail.com> wrote:
> Hi All,
>
Hi Mark,

> I'm relatively new to LLVM (but not optimizing compilers), and have been
> reading docs and browsing code.
>
Bienvenue!

> I noticed in the 2.4 release notes that a sparse propagation framework had
> been added based on the SCCP algorithm. I might have a need for exactly this
> kind of framework in order to prototype an analysis I have in mind.
>
> I also noticed, however, that this doesn't appear to be in use at this time.
>
It is being used:

opt.cpp:

void AddStandardCompilePasses(PassManager &PM) {
...
  addPass(PM, createSCCPPass());                 // Constant prop with
SCCP


and in gcc/llvm-backend.cpp:

static void createPerModuleOptimizationPasses() {
...
      PM->add(createSCCPPass());                  // Constant prop
with SCCP

-bw