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LLVM backend for 6502
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Chandler Carruth 681add7a63 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173340 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-24 11:53:01 +00:00
autoconf Disable Uninitialized Use Warnings for Broken gcc Versions 2013-01-15 18:21:15 +00:00
bindings
cmake
docs Fix small typo 2013-01-23 22:05:19 +00:00
examples Update links to "Itanium C++ ABI: Exception Handling" document 2013-01-13 15:53:09 +00:00
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 llvm-symbolizer: factor out bits of the tool into separate LLVMSymbolize.{h,cpp} files. No functionality change. 2013-01-22 14:21:19 +00:00
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
.arcconfig
.gitignore
CMakeLists.txt
CODE_OWNERS.TXT Update CODE_OWNERS.TXT. 2013-01-15 09:37:45 +00:00
configure Disable Uninitialized Use Warnings for Broken gcc Versions 2013-01-15 18:21:15 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Introduce llvm::sys::getProcessTriple() function. 2013-01-16 17:27:22 +00:00
Makefile.rules Pass NO_MISSING_FIELD_INITIALIZERS to Compiler Flags 2013-01-18 23:22:52 +00:00
README.txt Update README.txt to more accurately reflect reality. 2013-01-08 02:35:15 +00:00

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