Make SymCC compatible with LLVM 16

Part of eng/toolchain/llvm-project#1.

CMakeLists.txt

@@ -80,8 +80,8 @@ find_package(LLVM REQUIRED CONFIG)
 message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
 message(STATUS "Using LLVMConfig.cmake from ${LLVM_DIR}")
 
-if (${LLVM_VERSION_MAJOR} LESS 8 OR ${LLVM_VERSION_MAJOR} GREATER 15)
-  message(WARNING "The software has been developed for LLVM 8 through 15; \
+if (${LLVM_VERSION_MAJOR} LESS 8 OR ${LLVM_VERSION_MAJOR} GREATER 16)
+  message(WARNING "The software has been developed for LLVM 8 through 16; \
 it is unlikely to work with other versions!")
 endif()
 

README.md

@@ -16,7 +16,7 @@ program. The actual computation happens through calls to the support library at
 run time.
 
 To build the pass and the support library, install LLVM (any version between 8
-and 15) and Z3 (version 4.5 or later), as well as a C++ compiler with support
+and 16) and Z3 (version 4.5 or later), as well as a C++ compiler with support
 for C++17. LLVM lit is only needed to run the tests; if it's not packaged with
 your LLVM, you can get it with `pip install lit`.
 

compiler/Main.cpp

@@ -42,6 +42,8 @@ using namespace llvm;
 // Legacy pass registration (up to LLVM 13)
 //
 
+#if LLVM_VERSION_MAJOR <= 15
+
 void addSymbolizeLegacyPass(const PassManagerBuilder & /* unused */,
                             legacy::PassManagerBase &PM) {
   PM.add(createScalarizerPass());
@@ -57,6 +59,8 @@ static struct RegisterStandardPasses Y(PassManagerBuilder::EP_VectorizerStart,
 static struct RegisterStandardPasses
     Z(PassManagerBuilder::EP_EnabledOnOptLevel0, addSymbolizeLegacyPass);
 
+#endif
+
 //
 // New pass registration (LLVM 13 and above)
 //

compiler/Pass.cpp

@@ -110,7 +110,11 @@ bool canLower(const CallInst *CI) {
   case Intrinsic::roundeven:
 #endif
   case Intrinsic::copysign:
+#if LLVM_VERSION_MAJOR < 16
   case Intrinsic::flt_rounds:
+#else
+  case Intrinsic::get_rounding:
+#endif
   case Intrinsic::invariant_start:
   case Intrinsic::lifetime_start:
   case Intrinsic::invariant_end: