[flang] [mlir rebase] Add MLIR config and react to MLIR name changes (flang-compiler/f18#1090)

[mlir rebase] Add MLIR config and react to MLIR name changes

Similar to flang-compiler/f18#1085.  Now use the MLIR package to set up paths for include files and libraries.  Three MLIR names changed:
 * VectorOpsDialect to VectorDialect
 * AffineOpsDialect to AffineDialect
 * createVectorizePass to createSuperVectorizePass

Update README.md to explain how to link with MLIR. Update the example gcc to version 8.3.

Update drone.io config to define -DMLIR_DIR

Co-authored-by: Jean Perier <jperier@nvidia.com>

Original-commit: flang-compiler/f18@116f64315f
Reviewed-on: https://github.com/flang-compiler/f18/pull/1090

flang/.drone.star

@@ -14,7 +14,7 @@ def clang(arch):
                     "ninja install",
                     "cd ../..",
                     "mkdir build && cd build",
-                    'env CC=clang-8 CXX=clang++-8 CXXFLAGS="-UNDEBUG -stdlib=libc++" LDFLAGS="-fuse-ld=lld" cmake -GNinja -DCMAKE_BUILD_TYPE=Release .. -DLLVM_DIR=/drone/src/llvm-project/install/lib/cmake/llvm -DLLVM_EXTERNAL_LIT=/drone/src/llvm-project/build/bin/llvm-lit',
+                    'env CC=clang-8 CXX=clang++-8 CXXFLAGS="-UNDEBUG -stdlib=libc++" LDFLAGS="-fuse-ld=lld" cmake -GNinja -DCMAKE_BUILD_TYPE=Release .. -DLLVM_DIR=/drone/src/llvm-project/install/lib/cmake/llvm -DMLIR_DIR=/drone/src/llvm-project/install/lib/cmake/mlir -DLLVM_EXTERNAL_LIT=/drone/src/llvm-project/build/bin/llvm-lit',
                     "ninja -j8",
                     "ctest --output-on-failure -j24",
                     "ninja check-all",
@@ -40,7 +40,7 @@ def gcc(arch):
                         "ninja install",
                         "cd ../..",
                         "mkdir build && cd build",
-                        'env CC=gcc CXX=g++ CXXFLAGS="-UNDEBUG" LDFLAGS="-fuse-ld=gold" cmake -GNinja -DCMAKE_BUILD_TYPE=Release .. -DLLVM_DIR=/drone/src/llvm-project/install/lib/cmake/llvm -DLLVM_EXTERNAL_LIT=/drone/src/llvm-project/build/bin/llvm-lit',
+                        'env CC=gcc CXX=g++ CXXFLAGS="-UNDEBUG" LDFLAGS="-fuse-ld=gold" cmake -GNinja -DCMAKE_BUILD_TYPE=Release .. -DLLVM_DIR=/drone/src/llvm-project/install/lib/cmake/llvm -DMLIR_DIR=/drone/src/llvm-project/install/lib/cmake/mlir -DLLVM_EXTERNAL_LIT=/drone/src/llvm-project/build/bin/llvm-lit',
                         "ninja -j8",
                         "ctest --output-on-failure -j24",
                         "ninja check-all",

flang/CMakeLists.txt

@@ -67,6 +67,10 @@ project(Flang)
 
   if(LINK_WITH_FIR)
     include(TableGen)
+    find_package(MLIR REQUIRED CONFIG)
+    # Use SYSTEM for the same reasons as for LLVM includes
+    include_directories(SYSTEM ${MLIR_INCLUDE_DIRS})
+    list(APPEND CMAKE_MODULE_PATH ${MLIR_DIR})
     include(AddMLIR)
     find_program(MLIR_TABLEGEN_EXE "mlir-tblgen" ${LLVM_TOOLS_BINARY_DIR}
       NO_DEFAULT_PATH)

flang/README.md

@@ -72,12 +72,16 @@ https://llvm.org/docs/GettingStarted.html.
 We highly recommend using the same compiler to compile both llvm and f18.
 
 The f18 CMakeList.txt file uses
-the variable `LLVM_DIR` to find the installed components.
+the variable `LLVM_DIR` to find the installed LLVM components
+and
+the variable `MLIR_DIR` to find the installed MLIR components.
 
-To get the correct LLVM libraries included in your f18 build,
+To get the correct LLVM and MLIR libraries included in your f18 build,
-define LLVM_DIR on the cmake command line.
+define LLVM_DIR and MLIR_DIR on the cmake command line.
 ```
-LLVM=<LLVM_BUILD_DIR>/lib/cmake/llvm cmake -DLLVM_DIR=$LLVM ...
+LLVM=<LLVM_BUILD_DIR>/lib/cmake/llvm \
+MLIR=<LLVM_BUILD_DIR>/lib/cmake/mlir \
+cmake -DLLVM_DIR=$LLVM -DMLIR_DIR=$MLIR ...
 ```
 where `LLVM_BUILD_DIR` is
 the top-level directory where LLVM was built.
@@ -121,7 +125,11 @@ make install
 ```
 
 Then, `-DLLVM_DIR` would have to be set to
- `<where/you/want/to/build/llvm>/install/lib/cmake/llvm` in f18 cmake command.
+ `<where/you/want/to/build/llvm>/install/lib/cmake/llvm`
+and, `-DMLIR_DIR` would have to be set to
+ `<where/you/want/to/build/llvm>/install/lib/cmake/mlir`
+
+in f18 cmake command.
 
 To run lit tests,
 `-DLLVM_EXTERNAL_LIT=<where/you/want/to/build/llvm>/build/bin/llvm-lit` must be
@@ -142,13 +150,13 @@ Or,
 cmake will use the variable CXX to find the C++ compiler.
 CXX should include the full path to the compiler
 or a name that will be found on your PATH,
-e.g. g++-7.2, assuming g++-7.2 is on your PATH.
+e.g. g++-8.3, assuming g++-8.3 is on your PATH.
 ```
-export CXX=g++-7.2
+export CXX=g++-8.3
 ```
 or
 ```
-CXX=/opt/gcc-7.2/bin/g++-7.2 cmake ...
+CXX=/opt/gcc-8.3/bin/g++-8.3 cmake ...
 ```
 
 ### Building f18 with clang
@@ -189,7 +197,7 @@ Release builds execute quickly.
 ### Build F18
 ```
 cd ~/f18/build
-cmake -DLLVM_DIR=$LLVM ~/f18/src
+cmake -DLLVM_DIR=$LLVM -DMLIR_DIR=$MLIR ~/f18/src
 make
 ```
 
@@ -198,7 +206,7 @@ make
 To run all tests:
 ```
 cd ~/f18/build
-cmake -DLLVM_DIR=$LLVM ~/f18/src
+cmake -DLLVM_DIR=$LLVM -DMLIR_DIR=$MLIR ~/f18/src
 make test check-all
 ```
 

flang/include/flang/Optimizer/Dialect/FIRDialect.h

@@ -50,11 +50,11 @@ public:
 inline void registerFIR() {
   // we want to register exactly once
   [[maybe_unused]] static bool init_once = [] {
-    mlir::registerDialect<mlir::AffineOpsDialect>();
+    mlir::registerDialect<mlir::AffineDialect>();
     mlir::registerDialect<mlir::LLVM::LLVMDialect>();
     mlir::registerDialect<mlir::loop::LoopOpsDialect>();
     mlir::registerDialect<mlir::StandardOpsDialect>();
-    mlir::registerDialect<mlir::vector::VectorOpsDialect>();
+    mlir::registerDialect<mlir::vector::VectorDialect>();
     mlir::registerDialect<FIROpsDialect>();
     return true;
   }();
@@ -65,7 +65,7 @@ inline void registerFIR() {
 inline void registerGeneralPasses() {
   mlir::createCanonicalizerPass();
   mlir::createCSEPass();
-  mlir::createVectorizePass({});
+  mlir::createSuperVectorizePass({});
   mlir::createLoopUnrollPass();
   mlir::createLoopUnrollAndJamPass();
   mlir::createSimplifyAffineStructuresPass();