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LLVM backend for 6502
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Jakob Stoklund Olesen 0e0a8806d4 Extend the SpillPlacement interface with two new features. 
The PrefBoth constraint is used for blocks that ideally want a live-in
value both on the stack and in a register. This would be used by a block
that has a use before interference forces a spill.

Secondly, add the ChangesValue flag to BlockConstraint. This tells
SpillPlacement if a live-in value on the stack can be reused as a
live-out stack value for free. If the block redefines the virtual
register, a spill would be required for that.

This extra information will be used by SpillPlacement to more accurately
calculate spill costs when a value can exist both on the stack and in a
register.

The simplest example is a basic block that reads the virtual register,
but doesn't change its value. Spilling around such a block requires a
reload, but no spill in the block.

The spiller already knows this, but the spill placer doesn't. That can
sometimes lead to suboptimal regions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136731 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-02 21:53:03 +00:00
autoconf Update the default bug report url in autoconf. 2011-08-02 20:53:43 +00:00
bindings Remove InvalidateStructLayoutInfo from the ocaml bindings. 2011-07-31 01:12:39 +00:00
cmake Remove yet another buried and hidden implicit dependency: every single 2011-07-30 08:47:05 +00:00
docs Add the documentation for the 'landingpad' instruction. Improve the 'invoke' 2011-08-02 21:52:38 +00:00
examples
include Move methods in PassManagerBuilder offline. 2011-08-02 21:50:27 +00:00
lib Extend the SpillPlacement interface with two new features. 2011-08-02 21:53:03 +00:00
projects
runtime Use version 402 for the GCDA files when compiling for Apple. 2011-07-28 18:12:20 +00:00
test Lifetime intrinsics on undef are dead. 2011-08-02 21:19:27 +00:00
tools Move methods in PassManagerBuilder offline. 2011-08-02 21:50:27 +00:00
unittests Avoid undefined behaviour if somehow NUM_GRAPHS equals 2^32 (or 2011-07-29 07:50:02 +00:00
utils ARM: rename addrmode7 to addr_offset_none. 2011-08-02 18:07:32 +00:00
website
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build-for-llvm-top.sh
CMakeLists.txt
configure Combine all MC initialization routines into one. e.g. InitializeX86MCAsmInfo, 2011-07-22 21:58:54 +00:00
CREDITS.TXT I am the code owner for Clang's IR generation; this has been true 2011-08-02 01:38:19 +00:00
LICENSE.TXT
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