[NVPTX] do not run DCE after SLSR and SeparateConstOffsetFromGEP

Summary:
With D9096 and D9101, there's no need to run DCE after SLSR and
SeparateConstOffsetFromGEP.

Test Plan: no regression

Reviewers: jholewinski, meheff

Subscribers: jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D9172

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235415 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/NVPTX/NVPTXTargetMachine.cpp b/lib/Target/NVPTX/NVPTXTargetMachine.cpp
index 1b6bc7145054b535bded901915402d039069d58b..f9545cc1d414b6b0c861bf303f5207a9c59df4cf 100644 (file)
--- a/lib/Target/NVPTX/NVPTXTargetMachine.cpp
+++ b/lib/Target/NVPTX/NVPTXTargetMachine.cpp
@@ -164,6 +164,10 @@ void NVPTXPassConfig::addIRPasses() {
   addPass(createNVPTXAssignValidGlobalNamesPass());
   addPass(createGenericToNVVMPass());
   addPass(createNVPTXFavorNonGenericAddrSpacesPass());
+  // FavorNonGenericAddrSpaces shortcuts unnecessary addrspacecasts, and leave
+  // them unused. We could remove dead code in an ad-hoc manner, but that
+  // requires manual work and might be error-prone.
+  addPass(createDeadCodeEliminationPass());
   addPass(createStraightLineStrengthReducePass());
   addPass(createSeparateConstOffsetFromGEPPass());
   // The SeparateConstOffsetFromGEP pass creates variadic bases that can be used
@@ -173,16 +177,6 @@ void NVPTXPassConfig::addIRPasses() {
     addPass(createGVNPass());
   else
     addPass(createEarlyCSEPass());
-  // Both FavorNonGenericAddrSpaces and SeparateConstOffsetFromGEP may leave
-  // some dead code.  We could remove dead code in an ad-hoc manner, but that
-  // requires manual work and might be error-prone.
-  //
-  // The FavorNonGenericAddrSpaces pass shortcuts unnecessary addrspacecasts,
-  // and leave them unused.
-  //
-  // SeparateConstOffsetFromGEP rebuilds a new index from the old index, and the
-  // old index and some of its intermediate results may become unused.
-  addPass(createDeadCodeEliminationPass());
 }
 
 bool NVPTXPassConfig::addInstSelector() {