[PATCH v2 19/50] helper-to-tcg: Pipeline, run optimization pass

Run a standard LLVM -Oz optimization pass, which makes up the bulk of
optimizations in helper-to-tcg.

Signed-off-by: Anton Johansson <[email protected]>
---
 subprojects/helper-to-tcg/src/Pipeline.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/subprojects/helper-to-tcg/src/Pipeline.cpp b/subprojects/helper-to-tcg/src/Pipeline.cpp
index a11c5fd353..571276de24 100644
--- a/subprojects/helper-to-tcg/src/Pipeline.cpp
+++ b/subprojects/helper-to-tcg/src/Pipeline.cpp
@@ -202,5 +202,17 @@ int main(int argc, char **argv) {
         MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
     }
 
+    //
+    // Run a -Oz optimization pass.  In general -Oz will prefer loop
+    // vectorization over unrolling, as compared to -O3.  In TCG, this
+    // translates to more utilization of gvec and possibly smaller TBs.
+    //
+
+    // Optimization passes
+    MPM.addPass(PB.buildModuleSimplificationPipeline(
+        compat::OptimizationLevel::Oz, compat::LTOPhase));
+    MPM.addPass(
+        PB.buildModuleOptimizationPipeline(compat::OptimizationLevel::Oz, {}));
+
     return 0;
 }
-- 
2.52.0