Reorder passes a bit. In particular, it makes sense to run globaldce IMMEDIATELY after funcresolve. Also, run the mem2reg pass _early_ so that IPCP and DAE actually do stuff.
Run instcombine and simplify cfg after this to cleanup the intraprocedural messes we create.
llvm-svn: 10134
diff --git a/llvm/tools/gccas/gccas.cpp b/llvm/tools/gccas/gccas.cpp
index 0ed58b9..7d44d00 100644
--- a/llvm/tools/gccas/gccas.cpp
+++ b/llvm/tools/gccas/gccas.cpp
@@ -58,11 +58,13 @@
PM.add(createVerifierPass()); // Verify that input is correct
addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
- addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
- addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
addPass(PM, createGlobalDCEPass()); // Remove unused globals
+ addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
+ addPass(PM, createPromoteMemoryToRegister()); // "Construct SSA form"
addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
+ addPass(PM, createInstructionCombiningPass()); // Cleanup after IPCP & DAE
+ addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
addPass(PM, createPruneEHPass()); // Remove dead EH info