Support for LLVM 14 (#1492)

API changes we had to take into account:
* TargetRegistry.h location
* No more DisableTailCalls field in PassManagerBuilder.

Needed to update the ref image for render-microfacet test, some sparklies changed.
Looks like the new LLVM probably JITs to ever so slightly different math code, tickling
some LSB differences that at 1 sample per pixel, results in some different sampling
directions leading to fireflies. We decided to just commit a new ref image and move on.

Signed-off-by: Larry Gritz <lg@larrygritz.com>

.github/workflows/ci.yml

@@ -243,7 +243,7 @@ jobs:
             setenvs: export LLVM_VERSION=10.0.0
                             OPENIMAGEIO_CMAKE_FLAGS="-DBUILD_FMT_VERSION=7.0.1"
                             PUGIXML_VERSION=v1.10
-          - desc: latest releases gcc11/C++17 llvm12 boost1.71 exr3.1 py3.8 avx2 batch-b16avx512
+          - desc: latest releases gcc11/C++17 llvm13 boost1.71 exr3.1 py3.8 avx2 batch-b16avx512
             nametag: linux-latest-releases
             os: ubuntu-20.04
             cxx_compiler: g++-11
@@ -255,11 +255,11 @@ jobs:
             python_ver: 3.8
             simd: avx2,f16c
             batched: b8_AVX2,b8_AVX512,b16_AVX512
-            setenvs: export LLVM_VERSION=12.0.0
+            setenvs: export LLVM_VERSION=13.0.0
                             LLVM_DISTRO_NAME=ubuntu-20.04
                             OPENCOLORIO_VERSION=v2.1.1
                             PUGIXML_VERSION=v1.11.4
-          - desc: bleeding edge gcc11/C++17 llvm13 oiio/ocio/exr/pybind-master boost1.71 py3.9 avx2 batch-b16avx512
+          - desc: bleeding edge gcc11/C++17 llvm14 oiio/ocio/exr/pybind-master boost1.71 py3.9 avx2 batch-b16avx512
             nametag: linux-bleeding-edge
             os: ubuntu-20.04
             cxx_compiler: g++-11
@@ -271,8 +271,8 @@ jobs:
             python_ver: 3.9
             simd: avx2,f16c
             batched: b8_AVX2,b8_AVX512,b16_AVX512
-            setenvs: export LLVM_VERSION=13.0.0
-                            LLVM_DISTRO_NAME=ubuntu-20.04
+            setenvs: export LLVM_VERSION=14.0.0
+                            LLVM_DISTRO_NAME=ubuntu-18.04
                             OPENCOLORIO_VERSION=main
                             PUGIXML_VERSION=master
 

INSTALL.md

@@ -40,7 +40,7 @@ NEW or CHANGED dependencies since the last major release are **bold**.
     $OpenImageIO_ROOT/lib to be in your LD_LIBRARY_PATH (or
     DYLD_LIBRARY_PATH on OS X).
 
-* **[LLVM](http://www.llvm.org) 9, 10, 11, 12, or 13**, including clang
+* **[LLVM](http://www.llvm.org) 9, 10, 11, 12, 13, or 14**, including clang
   libraries.
 
 * [Boost](https://www.boost.org) 1.55 or newer (tested through boost 1.78)

src/build-scripts/build_llvm.bash

@@ -29,7 +29,7 @@ if [[ `uname` == "Linux" ]] ; then
     fi
     LLVMTAR=clang+llvm-${LLVM_VERSION}-x86_64-linux-gnu-${LLVM_DISTRO_NAME}.tar.xz
     echo LLVMTAR = $LLVMTAR
-    if [[ "$LLVM_VERSION" == "10.0.0" ]] || [[ "$LLVM_VERSION" == "11.0.0" ]] || [[ "$LLVM_VERSION" == "11.1.0" ]] || [[ "$LLVM_VERSION" == "12.0.0" ]] || [[ "$LLVM_VERSION" == "13.0.0" ]] ; then
+    if [[ "$LLVM_VERSION" == "10.0.0" ]] || [[ "$LLVM_VERSION" == "11.0.0" ]] || [[ "$LLVM_VERSION" == "11.1.0" ]] || [[ "$LLVM_VERSION" == "12.0.0" ]] || [[ "$LLVM_VERSION" == "13.0.0" ]]  || [[ "$LLVM_VERSION" == "14.0.0" ]]  || [[ "$LLVM_VERSION" == "14.0.1" ]] ; then
         # new
         curl --location https://github.com/llvm/llvm-project/releases/download/llvmorg-${LLVM_VERSION}/${LLVMTAR} -o $LLVMTAR
     else

src/liboslexec/llvm_util.cpp

@@ -45,7 +45,11 @@
 #include <llvm/Support/raw_os_ostream.h>
 #include <llvm/IR/LegacyPassManager.h>
 #include <llvm/IR/ValueSymbolTable.h>
+#if OSL_LLVM_VERSION < 140
 #include <llvm/Support/TargetRegistry.h>
+#else
+#include <llvm/MC/TargetRegistry.h>
+#endif
 
 #include <llvm/Bitcode/BitcodeReader.h>
 #include <llvm/Bitcode/BitcodeWriter.h>
@@ -1677,8 +1681,6 @@ LLVM_Util::setup_optimization_passes (int optlevel, bool target_host)
         builder.DisableUnrollLoops = false;
         builder.SLPVectorize = false;
         builder.LoopVectorize = false;
-        builder.DisableTailCalls = false;
-
         if (target_machine)
             target_machine->adjustPassManager(builder);