diff options
Diffstat (limited to 'tools/gccas/gccas.cpp')
| -rw-r--r-- | tools/gccas/gccas.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/gccas/gccas.cpp b/tools/gccas/gccas.cpp index 50ce920d0d..1d5f9d1ff8 100644 --- a/tools/gccas/gccas.cpp +++ b/tools/gccas/gccas.cpp @@ -46,6 +46,9 @@ namespace { cl::opt<bool> DisableOptimizations("disable-opt", cl::desc("Do not run any optimization passes")); + + cl::opt<bool> + DisableDSE("disable-dse", cl::desc("Do not run dead store elimination")); } @@ -99,11 +102,12 @@ void AddConfiguredTransformationPasses(PassManager &PM) { addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions addPass(PM, createGCSEPass()); // Remove common subexprs addPass(PM, createSCCPPass()); // Constant prop with SCCP - addPass(PM, createSCCPPass()); // Constant prop with SCCP // Run instcombine after redundancy elimination to exploit opportunities // opened up by them. addPass(PM, createInstructionCombiningPass()); + if (!DisableDSE) + addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE' addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types |