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Chandler Carruth bc67fc9f93 Switch the constant expression speculation cost evaluation away from 
a cost fuction that seems both a bit ad-hoc and also poorly suited to
evaluating constant expressions.

Notably, it is missing any support for trivial expressions such as
'inttoptr'. I could fix this routine, but it isn't clear to me all of
the constraints its other users are operating under.

The core protection that seems relevant here is avoiding the formation
of a select instruction wich a further chain of select operations in
a constant expression operand. Just explicitly encode that constraint.

Also, update the comments and organization here to make it clear where
this needs to go -- this should be driven off of real cost measurements
which take into account the number of constants expressions and the
depth of the constant expression tree.

llvm-svn: 173340
2013-01-24 11:53:01 +00:00
autoconf
bindings
cmake
docs Fix small typo 2013-01-23 22:05:19 +00:00
examples
include Add asserts to SmallVector so that calls to front() and back() only succeed 2013-01-24 04:29:24 +00:00
lib Switch the constant expression speculation cost evaluation away from 2013-01-24 11:53:01 +00:00
projects
runtime
test Switch the constant expression speculation cost evaluation away from 2013-01-24 11:53:01 +00:00
tools
unittests llvm/unittests: Use OwningPtr to fix --vg-leak. 2013-01-23 08:33:13 +00:00
utils Add the IR attribute 'sspstrong'. 2013-01-23 06:41:41 +00:00
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README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.