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add some completely unformated and probably incoherent notes about things
I saw while reading all the commits between the 2.5 and 2.6 release branches. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83287 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
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@ -52,24 +52,140 @@ current one. To see the release notes for a specific release, please see the
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</div>
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<!-- Unfinished features in 2.5:
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Machine LICM
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Many new papers added to /pubs/
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Machine LICM, hoists things like constant pool loads, loads from readonly stubs, vector constant synthesization code, etc.
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Machine Sinking
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target-specific intrinsics
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Regalloc improvements for commuting, various spiller peephole optimizations, cross-class coalescing.
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Support for debug line numbers when optimization enabled
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gold lto plugin
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pre-alloc splitter, strong phi elim
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<tt>llc -enable-value-prop</tt>, propagation of value info
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(sign/zero ext info) from one MBB to another
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debug info for optimized code
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target-specific intrinsics (r63765)
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<tt>llc -enable-value-prop</tt>, propagation of value info (sign/zero ext info) from one MBB to another
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interpreter + libffi
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LLVMContext
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Preliminary support for addrspace 256 -> GS, 257 -> FS, known problems: CodeGenerator.html#x86_memory
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Add support for the PowerPC 64-bit SVR4 ABI.
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NSW/NUW/exact div
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Inbounds for GEP
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SRoA improvements for vector unions, memset, arbitrary weird bitfield accesses etc. It now produces "strange" sized integers.
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pre-alloc splitter??
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Callgraph + SCCPassMgr??
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X86: Support for softfloat modes, typically used by OS kernels.
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MC:
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MCSection, MCAsmInfo
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MCInstPrinter did it make it in?
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MCInst (X86 using it so far)
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Rewrite of X86 GV selection logic: TargetOperand flags on ExternalSymbol, GV, etc operands.
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Can parse and re-print out an darwin-x86 .s file.
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TargetLoweringObjectFile, MCSectionKind
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Verrrry early start of a macho writer.
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ELF Writer? How stable?
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LSR promotes int induction variables to 64-bit on 64-bit targets, major perf boost for numerical code.
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LSR now analyzes pointer expressions (e.g. getelementptrs), not just integers.
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Stack slot coloring for register spills (denser stack frames)
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SelectionDAGS: New BuildVectorSDNode (r65296), and ISD::VECTOR_SHUFFLE (r69952 / PR2957)
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New PrettyStackTrace, crashes of llvm tools should give some indication of what the compiler was doing at the time of the crash (e.g. running a pass), and print out command line arguments.
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new linkage types linkonce_odr, weak_odr, linker_private, and available_externally.
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Inliner reuse stack space when inlining arrays?
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Regalloc hints for allocation stuff: Evan r73381/r73671. Finished/enabled?
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API Cleanup:
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no use of hash_set/hash_map, no more llvm::OStream
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Use raw_ostream for everything, killed off llvm/Streams.h and DOUT
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Mips now supports O32 Calling Convention
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StringRef class, Twine class.
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New BlackFin backend.
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Shrink wrapping support in PEI, what is the state of it?
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X86-64: better modeling of implicit zero extensions, eliminates a lot of redundant zexts
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X86-64 TLS support for local exec and initial exec.
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X86 - Better modeling of H registerts as subregs.
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Getelementpr instruction now allows any integer type for array/pointer indexes.
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include/llvm/Analysis/LiveValues.h => dead??
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lib/Analysis/LoopVR.cpp ==> dead??
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include/llvm/CodeGen/LazyLiveness.h ==> dead?
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lib/Transforms/IPO/MergeFunctions.cpp ==> dead?
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llvm/Analysis/PointerTracking.h ==> dead??
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PRedSimplify -> Ask vmkit if it is still useful and for testcases.
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ARM calling convention code is now tblgen generated instead of manual.
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ARM: NEON support. neonfp for doing single precision fp with neon instead of VFP.
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Tblgen now supports multiclass inheritance.
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Unladen swallow as user?
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Loop index split disabled by default?
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New WeakVH and AssertingVH and CallbackVH classes.
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New llvm/ADT/Triple class.
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Removed the IA64 backend.
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Profile info improvements by Andreas Neustifter.
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PostRA scheduler improvements David Goodwin.
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New MSP430 and SystemZ backends.
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llvm-gcc now supports a new TCE target.
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klee web page at klee.llvm.org
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New llvm/System/Atomic.h, llvm/System/RWMutex.h for portable atomic ops, rw locks.
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llvm_start_multithreaded: ProgrammersMAnual.html#threading
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Tablegen now supports a number of new string and list operations like
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!(subst), !(foreach), !car, !cdr, !null, !if, !cast.
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New fadd, fsub, fmul instructions and classes.
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New MachineVerifier pass.
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Enabled GVN Load PRE.
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ARM AAPCS-VFP hard float ABI is supported.
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LLVM build now builds all libraries as .a files instead of some
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libraries as relinked .o files. This requires some APIs like
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InitializeAllTargets.h. TargetRegistry!
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ARM Thumb2 support: status?
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CBE status: not part of the release criteria.
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New SourceMgr, SMLoc classes for simple parsers with caret diagnostics and #include support, (used by
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tablegen, llvm-mc, the .ll parser, FileCheck, etc)
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FileCheck! + CHECK-NEXT
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New compiler-rt project.
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New Static Single Information (SSI) construction pass (not used by anything yet, experimental).
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llvm_report_error() error handling API (llvm/Support/ErrorHandling.h)
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x86: Vector icmp/fcmp now work with SSE codegen.
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X86: all global variable reference logic is now in ClassifyGlobalReference.
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JIT support for oprofile (r75279), configure with --with-oprofile. Now we get line # and function info for JIT'd functions.
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Mention gcc plugin.
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New EngineBuilder class for creating JITs: r76276 Reid Kleckner <reid at kleckner.net>
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-asm-verbose now prints location info (with -g) and loop nest info.
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JIT now supports generating more than 16M of code.
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removed the BigBlock register allocator, it had bitrotted.
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Target intrinsics can now return multiple results.
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SSE 4.2 support.
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Ada bindings for LLVM IR.
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Many extensions to the C APIs.
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<!-- Unfinished features in 2.6:
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Mention gcc plugin.
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strong phi elim
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variable debug info for optimized code
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postalloc scheduler: anti dependence breaking, hazard recognizer?
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initial support for debug line numbers when optimization enabled, not useful in
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2.5 but will be for 2.6.
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metadata
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loop dependence analysis
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-->
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<!-- for announcement email:
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Logo web page.
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llvm devmtg
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compiler_rt
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-->
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<!-- *********************************************************************** -->
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