the size penalty. The primary intention of this package is to provide a
standalone library for other consumers of LLVM and the size difference
doesn't justify the small performance penalty. Bump revision.
The minimum compiler version required for building LLVM has been raised to 4.8 for GCC and 2015 for Visual Studio.
The C API functions LLVMAddFunctionAttr, LLVMGetFunctionAttr, LLVMRemoveFunctionAttr, LLVMAddAttribute, LLVMRemoveAttribute, LLVMGetAttribute, LLVMAddInstrAttribute and LLVMRemoveInstrAttribute have been removed.
The C API enum LLVMAttribute has been deleted.
The definition and uses of LLVM_ATRIBUTE_UNUSED_RESULT in the LLVM source were replaced with LLVM_NODISCARD, which matches the C++17 [[nodiscard]] semantics rather than gcc’s __attribute__((warn_unused_result)).
The Timer related APIs now expect a Name and Description. When upgrading code the previously used names should become descriptions and a short name in the style of a programming language identifier should be added.
LLVM now handles invariant.group across different basic blocks, which makes it possible to devirtualize virtual calls inside loops.
The aggressive dead code elimination phase (“adce”) now removes branches which do not effect program behavior. Loops are retained by default since they may be infinite but these can also be removed with LLVM option -adce-remove-loops when the loop body otherwise has no live operations.
The llvm-cov tool can now export coverage data as json. Its html output mode has also improved.
The previous commit ended up with two different specifications for libtool
on Darwin. One was the OS-specific version of CMAKE_ARGS introduced in the
previous commit; the other was inside a conditional to detect Darwin introduced in the commit prior. The former seems cleaner so it has been left.
The LLVMContext gains a new runtime check (see LLVMContext::discardValueNames()) that can be set to discard Value names (other than GlobalValue). This is intended to be used in release builds by clients that are interested in saving CPU/memory as much as possible.
There is no longer a “global context” available in LLVM, except for the C API.
The autoconf build system has been removed in favor of CMake. LLVM 3.9 requires CMake 3.4.3 or later to build. For information about using CMake please see the documentation on Building LLVM with CMake. For information about the CMake language there is also a CMake Primer document available.
C API functions LLVMParseBitcode, LLVMParseBitcodeInContext, LLVMGetBitcodeModuleInContext and LLVMGetBitcodeModule having been removed. LLVMGetTargetMachineData has been removed (use LLVMGetDataLayout instead).
The C API function LLVMLinkModules has been removed.
The C API function LLVMAddTargetData has been removed.
The C API function LLVMGetDataLayout is deprecated in favor of LLVMGetDataLayoutStr.
The C API enum LLVMAttribute and associated API is deprecated in favor of the new LLVMAttributeRef API. The deprecated functions are LLVMAddFunctionAttr, LLVMAddTargetDependentFunctionAttr, LLVMRemoveFunctionAttr, LLVMGetFunctionAttr, LLVMAddAttribute, LLVMRemoveAttribute, LLVMGetAttribute, LLVMAddInstrAttribute, LLVMRemoveInstrAttribute and LLVMSetInstrParamAlignment.
TargetFrameLowering::eliminateCallFramePseudoInstr now returns an iterator to the next instruction instead of void. Targets that previously did MBB.erase(I); return; now probably want return MBB.erase(I);.
SelectionDAGISel::Select now returns void. Out-of-tree targets will need to be updated to replace the argument node and remove any dead nodes in cases where they currently return an SDNode * from this interface.
Added the MemorySSA analysis, which hopes to replace MemoryDependenceAnalysis. It should provide higher-quality results than MemDep, and be algorithmically faster than MemDep. Currently, GVNHoist (which is off by default) makes use of MemorySSA.
The minimum density for lowering switches with jump tables has been reduced from 40% to 10% for functions which are not marked optsize (that is, compiled with -Os).
* Drop CppBackend. It is removed.
Changelog:
* GCC ABI Tag
* LLVM IR: new intrinsics etc.
* Change LLVM IPO model
* Support ThinLTO
* Improve the ARM targets, ARMv8.2-A support etc.
* Improve the MIPS targets
* Improve the PowerPC target, default optim O3 to O2
* Improve the X86 target, SKylake AVX-512 etc.
* Improve the AMDGPU, better support for Mesa 12
jperkin Mon Mar 7 16:27:47 UTC 2016
Do not use "-z discard-unused" linker flags on SunOS, it is only supported
by the very latest Oracle Solaris release.
Decouple the package from lang/clang that so it can be maintained
and updated independently.
This switches the build framework from autoconf to cmake.
There are no significant changes to the AMDGPU target mentioned in
the release notes. Other changes are not relevant to mention here since
mesa is the only user of this package in pkgsrc proper.
Compacted version of upstream's release notes:
The LLVM C API LLVMGetTargetMachineData is deprecated
DataLayout is no longer optional
Comdats are now ortogonal to the linkage
On ELF now supports multiple sections with the same name and comdat
LLVM now lazily loads metadata in some cases
Creating archives with IR files with debug info is now 25X faster
llvm-ar(1) can create archives in the BSD format used by OS X
LLVM received a backend for the extended Berkely Packet Filter instruction set
The BPF target is now available by default
Switch-case lowering was rewritten to avoid generating unbalanced search trees
The debug info IR class hierarchy now inherits from Metadata
Argument-less TargetMachine::getSubtarget has been removed from the tree
* Support for AuroraUX has been removed.
* Added support for a native object file-based bitcode wrapper format.
* Added support for MSVC’s __vectorcall calling convention as x86_vectorcallcc.
* Prefix data rework
* Metadata is not a Value
* Alias syntax change
* The old JIT has been removed
* object::Binary doesn’t own the file buffer
* IR in object files is now supported
* The gold plugin has been rewritten
