mirror of
https://github.com/RPCS3/llvm-mirror.git
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distribute various bullets to different sections.
llvm-svn: 145196
This commit is contained in:
Chris Lattner
parent
9ab5855a19
commit
e6841be524
@ -743,210 +743,54 @@ be used to verify some algorithms.
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loop dependence analysis
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CorrelatedValuePropagation
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lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
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Integrated assembler on by default for arm/thumb?
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-->
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<p><b>llvm-gcc is gone</b>. LLVM's configure script doesn't depend on llvm-gcc anymore, clean layering.</p>
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<p>LLVM 3.0 includes several major new capabilities:</p>
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<!-- Near dead:
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<!-- Near dead:
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Analysis/RegionInfo.h + Dom Frontiers
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SparseBitVector: used in LiveVar.
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llvm/lib/Archive - replace with lib object?
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-->
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<!--
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Type system rewrite: http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html
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Better performance for Neon code in clang due to SRoA improvements.
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New regalloc on by default. Lin scan going away in 3.1
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PGO / builtin_expect improvements (summary needed)
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Big EH rewrite.
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AVX support, assembler, compiler and disassembler.
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IndVar improvements: andy
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PTX backend improvements: Justin
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llvm-rtdyld & MC JIT: JimG
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InstAliases now automatically used in the asmprinter where they are shorter.
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Integrated assembler on by default for arm/thumb?
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PostOrder Dominator frontiers were removed.
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Line Profiling / gcov support
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EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
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X86-64 generates smaller and faster code at -O0 (fast isel improvements)
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Better code generation for Cortex-A9
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Many APIs take ArrayRef's now.
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Pass manager extension API.
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ARM inline asm constraints implemented.
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LangRef.html#fnattrs uwtable attribute for asynch unwind tables.
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better performance for indirect gotos.
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llvm.prefetch now takes a 4th argument that specifies whether the prefetch happens to the icache or dcache.
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New PackedVector, TinyPtrVector class (see Programmer's Manual)
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New nonlazybind function attribute.
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ARC language specific optimizer (Transforms/ObjCARC) a decent example of language-specific transformation.
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LLVM 3.0 removes support for reading LLVM 2.8 and earlier files. Aim to maintain compatibility all the way back to 3.0 "forever".
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-->
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New llvm.expect intrinsic.
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Table generated MC expansion logic for pseudo instructions that expand to multiple MC instructions through the PseudoInstExpansion class. (JimG)
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New llvm.fma intrinsic.
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Euro dev meeting and main one too.
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New atomics instructions, "#i_fence" instruction, cmpxchg, atomicrmw too. What target support (X86/ARM)? Also 'atomic load/store'. See Atomics.html
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X86: inline assembler supports .code32 and .code64.
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Exception handling rewrite: new landingpad and resume instruction. Unwind gone.
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LowerSetJmp pass removed, unused.
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llvm-objdump / dwarf parser library / llvm-dwarfdump (d0k)
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object file parsing stuff and llvm-size (mspencer)
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llvm-cov (devang)
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Old arm disassembler replaced with a new one based on autogenerated encoding information from ARM .td files.
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Frontend tests removed from llvm/test/Frontend* (was this completed for 3.0?)
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Segmented stack support (X86 only?) Rafael and Sanjoy Das: docs/SegmentedStacks.html should be in CodeGen.html status table?
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X86 backend support for NaCl (David Meyer / Nick L)
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Codegen now supports vector "select" operations on vector comparisons, turning
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them into various optimized code sequences (e.g. using the SSE4/AVX "blend"
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instructions).
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#line directives in integrated assembler
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SSE domain fixing code enabled for AVX (Bruno/Jakob). Domain fixing pass is
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now target independent (ExecutionDepsFix pass). (Jakob)
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X86 backend synthesizes horizontal add/sub instructions from generic code.
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returns_twice attribute (rafael)
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Tablegen has been split into a library, clang tblgen pieces now live in clang.
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The llvm version is now named llvm-tblgen instead of tblgen.
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X86: Tons of encoding improvements and new instructions (e.g. Atom, Ivy Bridge,
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and BMI instructions)
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added to assembler and disassembler (Craig Topper)
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data layout string can encode the natural alignment of the target's stack for better optimization (LangRef.html#datalayout)
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-->
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<ul>
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<!--
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<li></li>
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-->
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</ul>
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</div>
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<!--=========================================================================-->
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<!-- EH details: to be moved to a blog post:
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<p>One of the biggest changes is that 3.0 has a new exception handling
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system. The old system used LLVM intrinsics to convey the exception handling
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information to the code generator. It worked in most cases, but not
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all. Inlining was especially difficult to get right. Also, the intrinsics
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could be moved away from the <code>invoke</code> instruction, making it hard
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to recover that information.</p>
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<p>The new EH system makes exception handling a first-class member of the IR. It
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adds two new instructions:</p>
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<p>LLVM 3.0 includes several major changes:</p>
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<ul>
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<li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> —
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this instruction defines a landing pad basic block. It contains all of the
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information that's needed by the code generator. It's also required to be
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the first non-PHI instruction in the landing pad. In addition, a landing
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pad may be jumped to only by the unwind edge of an <code>invoke</code>
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instruction.</li>
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<li>llvm-gcc is no longer supported, and not included in the release. We
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recommend switching to <a
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href="http://clang.llvm.org/">Clang</a> or <a
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href="http://dragonegg.llvm.org/">DragonEgg</a>.</li>
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<li><a href="LangRef.html#i_resume"><code>resume</code></a> — this
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instruction causes the current exception to resume traveling up the
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stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
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<li>The linear scan register allocator has been replaced with a new "greedy"
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register allocator, enabling live range splitting and many other
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optimizations that lead to better code quality. Please see its <a
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href="http://blog.llvm.org/2011/09/greedy-register-allocation-in-llvm-30.html">blog post</a> or its talk at the <a
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href="http://llvm.org/devmtg/2011-11/">Developer Meeting</a>
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for more information.</li>
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<li> New <a href="Atomics.html">atomics</a> instructions, "#i_fence" instruction, cmpxchg, atomicrmw too. What target support (X86/ARM)? Also 'atomic load/store'.
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</li>
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<li>The LLVM IR exception handling representation has been redesigned and
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reimplemented, making it more elegant, fixing a huge number of bugs, and
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enabling inlining and other optimizations. Please see its blog post (XXX
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not yet) for more information.</li>
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<li>The LLVM IR Type system has been redesigned and reimplemented, making it
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faster and solving some long-standing problems.
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Please see its <a
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href="http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html">blog
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post</a> for more information.</li>
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<li>The MIPS backend has made major leaps in this release, going from an
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experimental target to being virtually production quality that supports a
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wide variety of MIPS subtargets. See the <a href="#MIPS">MIPS section</a>
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below for more information.</li>
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<li>The optimizer and code generator now supports gprof and gcov-style coverage
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and profiling information, and includes a new llvm-cov tool. Clang exposes
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this through GCC-compatible command line options.</li>
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</ul>
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<p>Converting from the old EH API to the new EH API is rather simple, because a
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lot of complexity has been removed. The two intrinsics,
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<code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
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superseded by the <code>landingpad</code> instruction. Instead of generating
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a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
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<div class="doc_code">
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<pre>
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Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
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Intrinsic::eh_exception);
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Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
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Intrinsic::eh_selector);
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// The exception pointer.
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Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
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std::vector<Value*> Args;
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Args.push_back(ExnPtr);
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Args.push_back(Builder.CreateBitCast(Personality,
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Type::getInt8PtrTy(Context)));
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<i>// Add selector clauses to Args.</i>
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// The selector call.
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Builder.CreateCall(SlctrIntr, Args, "exc_sel");
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</pre>
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</div>
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<p>You should instead generate a <code>landingpad</code> instruction, that
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returns an exception object and selector value:</p>
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<div class="doc_code">
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<pre>
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LandingPadInst *LPadInst =
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Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
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Personality, 0);
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Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
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Builder.CreateStore(LPadExn, getExceptionSlot());
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Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
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Builder.CreateStore(LPadSel, getEHSelectorSlot());
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</pre>
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</div>
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<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
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instruction.</p>
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<div class="doc_code">
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<pre>
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<i><b>// Adding a catch clause</b></i>
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Constant *TypeInfo = getTypeInfo();
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LPadInst->addClause(TypeInfo);
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<i><b>// Adding a C++ catch-all</b></i>
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LPadInst->addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
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<i><b>// Adding a cleanup</b></i>
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LPadInst->setCleanup(true);
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<i><b>// Adding a filter clause</b></i>
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std::vector<Constant*> TypeInfos;
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Constant *TypeInfo = getFilterTypeInfo();
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TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
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ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
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LPadInst->addClause(ConstantArray::get(FilterTy, TypeInfos));
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</pre>
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</div>
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<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
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the <code>resume</code> instruction is trivial. It takes the exception
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pointer and exception selector values returned by
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the <code>landingpad</code> instruction:</p>
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<div class="doc_code">
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<pre>
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Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
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Builder.getInt32Ty(), NULL);
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Value *UnwindData = UndefValue::get(UnwindDataTy);
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Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
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Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
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UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
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UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
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Builder.CreateResume(UnwindData);
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</pre>
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</div>
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-->
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<!--=========================================================================-->
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<h3>
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@ -958,8 +802,15 @@ Builder.CreateResume(UnwindData);
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<p>LLVM IR has several new features for better support of new targets and that
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expose new optimization opportunities:</p>
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|
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|
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|
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New llvm.expect intrinsic.
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New llvm.fma intrinsic.
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|
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LangRef.html#fnattrs uwtable attribute for asynch unwind tables.
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llvm.prefetch now takes a 4th argument that specifies whether the prefetch happens to the icache or dcache.
|
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New nonlazybind function attribute.
|
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data layout string can encode the natural alignment of the target's stack for better optimization (LangRef.html#datalayout)
|
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returns_twice attribute (rafael)
|
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|
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</div>
|
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|
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<!--=========================================================================-->
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@ -997,6 +848,8 @@ Builder.CreateResume(UnwindData);
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optimizers:</p>
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<ul>
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Pass manager extension API.
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|
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<li>Information about <a href="BranchWeightMetadata.html">branch probability</a>
|
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and basic block frequency is now available within LLVM, based on a
|
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combination of static branch prediction heuristics and
|
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@ -1004,7 +857,9 @@ Builder.CreateResume(UnwindData);
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register spill placement and if-conversion, with additional optimizations
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planned for future releases. The same framework is intended for eventual
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||||
use with profile-guided optimization.</li>
|
||||
</li>
|
||||
|
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ARC language specific optimizer (Transforms/ObjCARC) a decent example of language-specific transformation.
|
||||
|
||||
|
||||
</ul>
|
||||
|
||||
@ -1038,6 +893,17 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
|
||||
to the LLVM MC Project Blog Post</a>.</p>
|
||||
|
||||
|
||||
InstAliases now automatically used in the asmprinter where they are shorter.
|
||||
|
||||
Table generated MC expansion logic for pseudo instructions that expand to multiple MC instructions through the PseudoInstExpansion class. (JimG)
|
||||
|
||||
#line directives in integrated assembler
|
||||
|
||||
llvm-rtdyld: JimG
|
||||
llvm-objdump / dwarf parser library / llvm-dwarfdump (d0k)
|
||||
object file parsing stuff and llvm-size (mspencer)
|
||||
|
||||
</div>
|
||||
|
||||
<!--=========================================================================-->
|
||||
@ -1052,6 +918,17 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
make it run faster:</p>
|
||||
|
||||
<ul>
|
||||
|
||||
better performance for indirect gotos through new tail dup pass.
|
||||
|
||||
Codegen now supports vector "select" operations on vector comparisons, turning
|
||||
them into various optimized code sequences (e.g. using the SSE4/AVX "blend"
|
||||
instructions).
|
||||
|
||||
EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
|
||||
|
||||
Domain fixing pass is now target independent (ExecutionDepsFix pass). (Jakob)
|
||||
|
||||
<!--
|
||||
<li></li>
|
||||
-->
|
||||
@ -1081,6 +958,16 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
<code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
|
||||
<code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
|
||||
|
||||
X86: inline assembler supports .code32 and .code64.
|
||||
AVX support, assembler, compiler and disassembler.
|
||||
X86 backend support for NaCl (David Meyer / Nick L)
|
||||
SSE domain fixing code enabled for AVX (Bruno/Jakob).
|
||||
X86 backend synthesizes horizontal add/sub instructions from generic code.
|
||||
X86: Tons of encoding improvements and new instructions (e.g. Atom, Ivy Bridge,
|
||||
and BMI instructions)
|
||||
added to assembler and disassembler (Craig Topper)
|
||||
X86-64 generates smaller and faster code at -O0 (fast isel improvements)
|
||||
|
||||
</ul>
|
||||
|
||||
</div>
|
||||
@ -1098,6 +985,12 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
<li>Reworked Set Jump Long Jump EH Lowering,</li>
|
||||
<li>improved support for Cortex-M series processors, and</li>
|
||||
<li>beta quality integrated assembler support.</li>
|
||||
|
||||
Better code generation for Cortex-A9
|
||||
ARM inline asm constraints implemented.
|
||||
Old arm disassembler replaced with a new one based on autogenerated encoding information from ARM .td files.
|
||||
Better performance for Neon code in clang due to SRoA improvements.
|
||||
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
@ -1181,6 +1074,15 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
from the previous release.</p>
|
||||
|
||||
<ul>
|
||||
<li>LLVM's configure script doesn't depend on llvm-gcc anymore, clean layering.</p>
|
||||
LLVM 3.0 removes support for reading LLVM 2.8 and earlier files. Aim to maintain compatibility all the way back to 3.0 "forever".
|
||||
Frontend tests removed from llvm/test/Frontend*
|
||||
Tablegen has been split into a library, clang tblgen pieces now live in clang.
|
||||
The llvm version is now named llvm-tblgen instead of tblgen.
|
||||
PostOrder Dominator frontiers were removed.
|
||||
LowerSetJmp pass removed, unused.
|
||||
|
||||
|
||||
<li>The <code>LLVMC</code> meta compiler driver was removed.</li>
|
||||
<li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
|
||||
target and has been removed.</li>
|
||||
@ -1343,8 +1245,8 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
|
||||
<ul>
|
||||
<li>The Alpha, Blackfin, CellSPU, MSP430, PTX, SystemZ and
|
||||
XCore backends are experimental, and several of these have already been
|
||||
removed from mainline.</li>
|
||||
XCore backends are experimental, and the Alpha, Blackfin and SystemZ
|
||||
targets have already been removed from mainline.</li>
|
||||
|
||||
<li>The integrated assembler, disassembler, and JIT is not supported by
|
||||
several targets. If an integrated assembler is not supported, then a
|
||||
@ -1381,6 +1283,130 @@ compiler and provides better integration with the platform ABI as a result.</p>
|
||||
|
||||
</div>
|
||||
|
||||
<!--=========================================================================-->
|
||||
|
||||
<!-- EH details: to be moved to a blog post:
|
||||
|
||||
|
||||
|
||||
|
||||
<p>One of the biggest changes is that 3.0 has a new exception handling
|
||||
system. The old system used LLVM intrinsics to convey the exception handling
|
||||
information to the code generator. It worked in most cases, but not
|
||||
all. Inlining was especially difficult to get right. Also, the intrinsics
|
||||
could be moved away from the <code>invoke</code> instruction, making it hard
|
||||
to recover that information.</p>
|
||||
|
||||
<p>The new EH system makes exception handling a first-class member of the IR. It
|
||||
adds two new instructions:</p>
|
||||
|
||||
<ul>
|
||||
<li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> —
|
||||
this instruction defines a landing pad basic block. It contains all of the
|
||||
information that's needed by the code generator. It's also required to be
|
||||
the first non-PHI instruction in the landing pad. In addition, a landing
|
||||
pad may be jumped to only by the unwind edge of an <code>invoke</code>
|
||||
instruction.</li>
|
||||
|
||||
<li><a href="LangRef.html#i_resume"><code>resume</code></a> — this
|
||||
instruction causes the current exception to resume traveling up the
|
||||
stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
|
||||
</ul>
|
||||
|
||||
<p>Converting from the old EH API to the new EH API is rather simple, because a
|
||||
lot of complexity has been removed. The two intrinsics,
|
||||
<code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
|
||||
superseded by the <code>landingpad</code> instruction. Instead of generating
|
||||
a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
|
||||
Intrinsic::eh_exception);
|
||||
Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
|
||||
Intrinsic::eh_selector);
|
||||
|
||||
// The exception pointer.
|
||||
Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
|
||||
|
||||
std::vector<Value*> Args;
|
||||
Args.push_back(ExnPtr);
|
||||
Args.push_back(Builder.CreateBitCast(Personality,
|
||||
Type::getInt8PtrTy(Context)));
|
||||
|
||||
<i>// Add selector clauses to Args.</i>
|
||||
|
||||
// The selector call.
|
||||
Builder.CreateCall(SlctrIntr, Args, "exc_sel");
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>You should instead generate a <code>landingpad</code> instruction, that
|
||||
returns an exception object and selector value:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
LandingPadInst *LPadInst =
|
||||
Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
|
||||
Personality, 0);
|
||||
|
||||
Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
|
||||
Builder.CreateStore(LPadExn, getExceptionSlot());
|
||||
|
||||
Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
|
||||
Builder.CreateStore(LPadSel, getEHSelectorSlot());
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
|
||||
instruction.</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
<i><b>// Adding a catch clause</b></i>
|
||||
Constant *TypeInfo = getTypeInfo();
|
||||
LPadInst->addClause(TypeInfo);
|
||||
|
||||
<i><b>// Adding a C++ catch-all</b></i>
|
||||
LPadInst->addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
|
||||
|
||||
<i><b>// Adding a cleanup</b></i>
|
||||
LPadInst->setCleanup(true);
|
||||
|
||||
<i><b>// Adding a filter clause</b></i>
|
||||
std::vector<Constant*> TypeInfos;
|
||||
Constant *TypeInfo = getFilterTypeInfo();
|
||||
TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
|
||||
|
||||
ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
|
||||
LPadInst->addClause(ConstantArray::get(FilterTy, TypeInfos));
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
|
||||
the <code>resume</code> instruction is trivial. It takes the exception
|
||||
pointer and exception selector values returned by
|
||||
the <code>landingpad</code> instruction:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
|
||||
Builder.getInt32Ty(), NULL);
|
||||
Value *UnwindData = UndefValue::get(UnwindDataTy);
|
||||
Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
|
||||
Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
|
||||
UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
|
||||
UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
|
||||
Builder.CreateResume(UnwindData);
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
|
||||
|
||||
|
||||
-->
|
||||
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
|
||||
<hr>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user