[NVPTX] Switch nvptx-use-infer-addrspace to true.

Summary:
This switches us to use a different, more powerful algorithm for address
space inference.  I've tested this locally and it seems to work great.
Once we're more confident in it, we can remove the old pass altogether.

Reviewers: jingyue

Subscribers: llvm-commits, tra, jholewinski

Differential Revision: https://reviews.llvm.org/D23694

llvm-svn: 279317

llvm/lib/Target/NVPTX/NVPTXInferAddressSpaces.cpp

@@ -87,9 +87,6 @@
 // Finally, it fixes the undef in %y' so that
 //   %y' = phi float addrspace(3)* [ %input, %y2' ]
 //
-// TODO: This pass is experimental and not enabled by default. Users can turn it
-// on by setting the -nvptx-use-infer-addrspace flag of llc. We plan to replace
-// NVPTXNonFavorGenericAddrSpaces with this pass shortly.
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "nvptx-infer-addrspace"

llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp

@@ -51,7 +51,7 @@
 using namespace llvm;
 
 static cl::opt<bool> UseInferAddressSpaces(
-    "nvptx-use-infer-addrspace", cl::init(false), cl::Hidden,
+    "nvptx-use-infer-addrspace", cl::init(true), cl::Hidden,
     cl::desc("Optimize address spaces using NVPTXInferAddressSpaces instead of "
              "NVPTXFavorNonGenericAddrSpaces"));
 

llvm/test/CodeGen/NVPTX/access-non-generic.ll

@@ -1,6 +1,7 @@
 ; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s --check-prefix PTX
 ; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s --check-prefix PTX
-; RUN: llc < %s  -march=nvptx64 -mcpu=sm_20 -nvptx-use-infer-addrspace | FileCheck %s --check-prefix PTX
+; RUN: llc < %s  -march=nvptx64 -mcpu=sm_20 -nvptx-use-infer-addrspace=true | FileCheck %s --check-prefix PTX
+; RUN: llc < %s  -march=nvptx64 -mcpu=sm_20 -nvptx-use-infer-addrspace=false | FileCheck %s --check-prefix PTX
 ; RUN: opt < %s -S -nvptx-favor-non-generic -dce | FileCheck %s --check-prefix IR
 ; RUN: opt < %s -S -nvptx-infer-addrspace | FileCheck %s --check-prefix IR --check-prefix IR-WITH-LOOP
 

llvm/test/CodeGen/NVPTX/addrspacecast.ll

@@ -1,5 +1,7 @@
-; RUN: llc < %s -march=nvptx -mcpu=sm_20 -disable-nvptx-favor-non-generic | FileCheck %s -check-prefix=PTX32
-; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 -disable-nvptx-favor-non-generic | FileCheck %s -check-prefix=PTX64
+; RUN: llc < %s -march=nvptx -mcpu=sm_20 -disable-nvptx-favor-non-generic \
+; RUN:   -nvptx-use-infer-addrspace=false | FileCheck %s -check-prefix=PTX32
+; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 -disable-nvptx-favor-non-generic \
+; RUN:   -nvptx-use-infer-addrspace=false | FileCheck %s -check-prefix=PTX64
 
 
 define i32 @conv1(i32 addrspace(1)* %ptr) {