From b7c85b49a4aa3c3a700a6324437c5c8e291a380d Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 21 Apr 2010 05:17:40 +0000 Subject: [PATCH] rough pass moving stuff into relevant sections, still much editing to do. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101987 91177308-0d34-0410-b5e6-96231b3b80d8 --- docs/ReleaseNotes.html | 253 +++++++++++++++++++++-------------------- 1 file changed, 132 insertions(+), 121 deletions(-) diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html index ba283d64684..736ef3786bf 100644 --- a/docs/ReleaseNotes.html +++ b/docs/ReleaseNotes.html @@ -60,10 +60,6 @@ main LLVM web page, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.

- -

FIXME: llvm.org moved to new server, mention new logo, Ted and Doug new code - owners, web page in llvm-www repos.

- @@ -79,14 +75,9 @@ Almost dead code. @@ -393,87 +403,25 @@ in this section.

LLVM 2.7 includes several major new capabilities:

- -Extensible metadata solid. - -Debug info improvements: using metadata instead of llvm.dbg global variables. -This brings several enhancements including improved compile times. - -New instruction selector. -GHC Haskell ABI/ calling conv support. -Pre-Alpha support for unions in IR. -New InlineHint and StackAlignment function attributes -Code generator MC'ized except for debug info and EH. -New SCEV AA pass: -scev-aa -Inliner reuses arrays allocas when inlining multiple callers to reduce stack usage. -MC encoding and disassembler apis. -Optimal Edge Profiling? -Instcombine is now a library, has its own IRBuilder to simplify itself. -New llvm/Support/Regex.h API. FileCheck now does regex's -Many subtle pointer invalidation bugs in Callgraph have been fixed and it now uses asserting value handles. -MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications -Various tools like llc and opt now read either .ll or .bc files as input. -Malloc and free instructions got removed, along with LowerAllocations pass. -compiler-rt support for ARM. -completely llvm-gcc NEON support. -Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1" -JIT debug information with GDB 7.0 -New CodeGen Level CSE -CMake can now run tests, what other improvements? -ARM/Thumb using reg scavenging for stack object address materialization (PEI). -New SSAUpdater and MachineSSAUpdater classes for unstructured ssa updating, - changed jump threading, GVN, etc to use it which simplified them and speed - them up. -Combiner-AA improvements, why not on by default? -Pre-regalloc tail duplication -x86 sibcall / tailcall optimization in CCC mode. -New LSR with "full strength reduction" mode. Description? -Codegen level OptimizeExtsPass pass, takes advantage of x86 subregs. -Better code size analysis in loop unswitch, inliner code split out to a new - CodeMetrics class for reuse. -The ARM backend now has good support for ARMv4 backend (tested on StrongARM - hardware), previously only supported ARMv4T and newer. -Half-float support in APFloat -Indirect branch + address of label (blog post), particularly useful for interpreters. -Many changes to the pass ordering for improved optimization effectiveness. -BasicAA improved to be less dependent on "type safe" pointers, it can now look - through bitcasts more aggressively. -GVN PHI Translation improvements. blog post: http://blog.llvm.org/2009/12/advanced-topics-in-redundant-load.html -llvm.objectsize. -MachineSSAUpdater.h -PostRA scheduler for X86? -llvm.dbg.value, not being used by default though, more in 2.8. Many improvements to debug info -Support for the GCC option -fno-schedule-insns -non-temporal load/store libllvm2.7.so?? configure with --enable-shared -dbgs() and -debug-buffer-size=N -New MicroBlaze backend. http://en.wikipedia.org/wiki/MicroBlaze -XMM subreg modeling for extraction of the low element. +MC encoding and disassembler apis. +MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications +Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1" -Opt now works conservatively if no target data is set (is this fully working?) -Target data now has notion of 'native' integer data types which optimizations can use. -ARM backend generates instructions in unified assembly syntax. -New Analysis/InstructionSimplify.h interface for simplifying instructions that don't exist. -Jump threading is now much more aggressive at simplifying correlated - conditionals and threading blocks with otherwise complex logic. CondProp pass - removed (functionality merged into jump threading). -X86 and XCore supports returning arbitrary return values, returning too many values is - supported by returning through a hidden pointer. -verbose-asm now produces information about spill slots and loop nests - - -Defaults to RTTI off (smaller code size!), packagers should build with make REQUIRE_RTTI=1. -AndersAA got removed -PredSimplify, LoopVR, GVNPRE, RSProfiling (random sampling profiling) got removed. -LLVM command line tools now overwrite their output, before they would only do this with -f. -DOUT removed, use DEBUG(errs() instead. -Much stuff converted to use raw_ostream instead of std::ostream. -TargetAsmInfo renamed to MCAsmInfo -llvm/ADT/iterator.h gone. - @@ -487,7 +435,13 @@ llvm/ADT/iterator.h gone. expose new optimization opportunities:

@@ -505,11 +459,29 @@ release includes a few major enhancements and additions to the optimizers:

-

Also, -anders-aa was removed

- @@ -521,15 +493,21 @@ release includes a few major enhancements and additions to the optimizers:

@@ -547,6 +525,23 @@ it run faster:

@@ -562,34 +557,14 @@ it run faster:

- -
-PIC16 Target Improvements -
- -
-

New features of the PIC16 target include: -

- - - -

Things not yet supported:

- - - -
-
ARM Target Improvements @@ -601,7 +576,12 @@ it run faster:

@@ -649,7 +629,13 @@ it run faster:

Other miscellaneous features include:

@@ -667,18 +653,45 @@ on LLVM 2.6, this section lists some "gotchas" that you may run into upgrading from the previous release.

+configure with --enable-libffi. +
  • Debug information uses a completely different representation, an LLVM 2.6 +.bc file should work with LLVM 2.7, but debug info won't come forward.
    • + +
  • The LLVM 2.6 (and earlier) "malloc" and "free" instructions got removed, + along with LowerAllocations pass. Now you should just use a call to the + malloc and free functions in libc. These calls are optimized as well as + the old instructions were.
    • +

    In addition, many APIs have changed in this release. Some of the major LLVM API changes are: