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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83852 91177308-0d34-0410-b5e6-96231b3b80d8
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Gabor Greif 2009-10-12 16:27:44 +00:00
parent 6bd7567910
commit 6bd6ede7d7
1 changed files with 20 additions and 17 deletions
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docs/ReleaseNotes-2.6.html
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@ -637,7 +637,8 @@ it run faster:</p>
commutable operations, various spiller peephole optimizations, and can now
coalesce cross-register-class copies.</li>
<li>Tblgen now supports multiclass inheritance and a number of new string and
list operations like !(subst), !(foreach), !car, !cdr, !null, !if, !cast.
list operations like <tt>!(subst)</tt>, <tt>!(foreach)</tt>, <tt>!car</tt>,
<tt>!cdr</tt>, <tt>!null</tt>, <tt>!if</tt>, <tt>!cast</tt>.
These make the .td files more expressive and allow more aggressive factoring
of duplication across instruction patterns.</li>
<li>Target-specific intrinsics can now be added without having to hack VMCore to
@ -656,12 +657,13 @@ it run faster:</p>
from the compiler. It works well for many simple C testcases, but doesn't
support exception handling, debug info, inline assembly, etc.</li>
<li>Targets can now specify register allocation hints through
MachineRegisterInfo::setRegAllocationHint. A regalloc hint consists of hint
type and physical register number. A hint type of zero specifies a register
allocation preference. Other hint type values are target specific which are
resolved by TargetRegisterInfo::ResolveRegAllocHint. An example is the ARM
target which uses register hints to request that the register allocator
provide an even / odd register pair to two virtual registers.</li>
<tt>MachineRegisterInfo::setRegAllocationHint</tt>. A regalloc hint consists
of hint type and physical register number. A hint type of zero specifies a
register allocation preference. Other hint type values are target specific
which are resolved by <tt>TargetRegisterInfo::ResolveRegAllocHint</tt>. An
example is the ARM target which uses register hints to request that the
register allocator provide an even / odd register pair to two virtual
registers.</li>
</ul>
</div>
@ -804,12 +806,13 @@ branched.</p>
make operations on character ranges and
string concatenation to be more efficient. StringRef is just a <tt>const
char*</tt> with a length, Twine is a light-weight rope.</li>
<li>LLVM has new WeakVH, AssertingVH and CallbackVH classes, which make it
easier to write LLVM IR transformations. WeakVH is automatically drops to
null when the referenced Value is deleted, and is updated across a
replaceAllUsesWith operation. AssertingVH aborts the program if the
referenced value is destroyed while it is being referenced. CallbackVH is
a customizable class for handling value references. See <a
<li>LLVM has new <tt>WeakVH</tt>, <tt>AssertingVH</tt> and <tt>CallbackVH</tt>
classes, which make it easier to write LLVM IR transformations. <tt>WeakVH</tt>
is automatically drops to null when the referenced <tt>Value</tt> is deleted,
and is updated across a <tt>replaceAllUsesWith</tt> operation.
<tt>AssertingVH</tt> aborts the program if the
referenced value is destroyed while it is being referenced. <tt>CallbackVH</tt>
is a customizable class for handling value references. See <a
href="http://llvm.org/doxygen/ValueHandle_8h-source.html">ValueHandle.h</a>
for more information.</li>
<li>The new '<a href="http://llvm.org/doxygen/Triple_8h-source.html">Triple
@ -823,9 +826,9 @@ branched.</p>
and <a href="http://llvm.org/doxygen/RWMutex_8h-source.html">reader/writer
locks</a>.</li>
<li>LLVM has new <a href="http://llvm.org/doxygen/SourceMgr_8h-source.html">
SourceMgr and SMLoc classes</a> which implement caret diagnostics and basic
include stack processing for simple parsers. It is used by tablegen,
llvm-mc, the .ll parser and FileCheck.</li>
<tt>SourceMgr</tt> and <tt>SMLoc</tt> classes</a> which implement caret
diagnostics and basic include stack processing for simple parsers. It is
used by tablegen, llvm-mc, the .ll parser and FileCheck.</li>
</ul>
@ -859,7 +862,7 @@ CPU2000).</li>
<ul>
<li>Dynamic plugins now work on Windows.</li>
<li>New option property: init. Makes possible to provide default values for
options defined in plugins (interface to cl::init).</li>
options defined in plugins (interface to <tt>cl::init</tt>).</li>
<li>New example: Skeleton, shows how to create a standalone LLVMC-based
driver.</li>
<li>New example: mcc16, a driver for the PIC16 toolchain.</li>