Jim Grosbach b58f498f75 Add register-reuse to frame-index register scavenging. When a target uses ... a virtual register to eliminate a frame index, it can return that register and the constant stored there to PEI to track. When scavenging to allocate for those registers, PEI then tracks the last-used register and value, and if it is still available and matches the value for the next index, reuses the existing value rather and removes the re-materialization instructions. Fancier tracking and adjustment of scavenger allocations to keep more values live for longer is possible, but not yet implemented and would likely be better done via a different, less special-purpose, approach to the problem. eliminateFrameIndex() is modified so the target implementations can return the registers they wish to be tracked for reuse. ARM Thumb1 implements and utilizes the new mechanism. All other targets are simply modified to adjust for the changed eliminateFrameIndex() prototype. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83467 91177308-0d34-0410-b5e6-96231b3b80d8		2009-10-07 17:12:56 +00:00
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Analysis	Add PR to this FIXME, looks like I didn't commit this change after all.	2009-10-07 09:22:55 +00:00
Archive	Prune #includes from llvm/Linker.h and llvm/System/Path.h,	2009-08-23 22:45:37 +00:00
AsmParser	strength reduce a ton of type equality tests to check the typeid (Through	2009-10-05 05:54:46 +00:00
Bitcode	strength reduce a ton of type equality tests to check the typeid (Through	2009-10-05 05:54:46 +00:00
CodeGen	Add register-reuse to frame-index register scavenging. When a target uses	2009-10-07 17:12:56 +00:00
CompilerDriver	convert LoopInfo.h and GraphWriter.h to use raw_ostream	2009-08-23 07:19:13 +00:00
ExecutionEngine	Introduce and use convenience methods for getting pointer types	2009-10-06 15:40:36 +00:00
Linker	Remove unnecessary #include.	2009-09-12 22:24:25 +00:00
MC	No newline at end of files.	2009-10-05 18:43:19 +00:00
Support	r83391 was completely broken since Twines keep references to their inputs, and	2009-10-06 21:45:26 +00:00
System	MingW build fixes	2009-10-02 19:36:31 +00:00
Target	Add register-reuse to frame-index register scavenging. When a target uses	2009-10-07 17:12:56 +00:00
Transforms	Add FreeInst to the "is a call" check for Insts that are calls, but	2009-10-07 00:54:08 +00:00
VMCore	Do not assume that the module is set.	2009-10-07 16:37:55 +00:00
Makefile	remove llvm-db: it is completely broken and if anyone wants to do a debugger,	2009-10-05 02:29:51 +00:00