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
..
Analysis	Use consistent terminology for loop exit/exiting blocks. Name change only.	2011-08-02 04:23:35 +00:00
Archive	Rewrite the CMake build to use explicit dependencies between libraries,	2011-07-29 00:14:25 +00:00
AsmParser	Add the 'resume' instruction for the new EH rewrite.	2011-07-31 06:30:59 +00:00
Bitcode	Add the 'resume' instruction for the new EH rewrite.	2011-07-31 06:30:59 +00:00
CodeGen	Extend the SpillPlacement interface with two new features.	2011-08-02 21:53:03 +00:00
CompilerDriver	Build CompilerDriver library.	2011-03-12 22:01:42 +00:00
ExecutionEngine	Rewrite the CMake build to use explicit dependencies between libraries,	2011-07-29 00:14:25 +00:00
Linker	Rewrite the CMake build to use explicit dependencies between libraries,	2011-07-29 00:14:25 +00:00
MC	Assume .cfi_startproc is the first thing in a function. If the function is	2011-08-02 20:24:22 +00:00
Object	Rewrite the CMake build to use explicit dependencies between libraries,	2011-07-29 00:14:25 +00:00
Support	Added several architecture names.	2011-07-30 01:29:54 +00:00
Target	Don't create a ridiculous EXTRACT_ELEMENT. PR10563.	2011-08-02 18:38:35 +00:00
Transforms	Move methods in PassManagerBuilder offline.	2011-08-02 21:50:27 +00:00
VMCore	Remove the LLVMBuildUnwind C API function.	2011-08-02 06:20:17 +00:00
CMakeLists.txt	Build CompilerDriver library.	2011-03-12 22:01:42 +00:00
Makefile