Const hoisting (#1176)

A pass that hoists repeating constants to a local, and replaces their uses with a get of that local. This can reduce binary size, but can also *increase* gzip size, so it's mostly for experimentation and not used by default.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/passes/pass.cpp b/src/passes/pass.cpp
index 728fe2371..4ec454a50 100644
--- a/src/passes/pass.cpp
+++ b/src/passes/pass.cpp
@@ -68,6 +68,7 @@ void PassRegistry::registerPasses() {
   registerPass("coalesce-locals-learning", "reduce # of locals by coalescing and learning", createCoalesceLocalsWithLearningPass);
   registerPass("code-pushing", "push code forward, potentially making it not always execute", createCodePushingPass);
   registerPass("code-folding", "fold code, merging duplicates", createCodeFoldingPass);
+  registerPass("const-hoisting", "hoist repeated constants to a local", createConstHoistingPass);
   registerPass("dce", "removes unreachable code", createDeadCodeEliminationPass);
   registerPass("duplicate-function-elimination", "removes duplicate functions", createDuplicateFunctionEliminationPass);
   registerPass("extract-function", "leaves just one function (useful for debugging)", createExtractFunctionPass);