Dan Gohman 97121ba2af Implement support for using modeling implicit-zero-extension on x86-64 ... with SUBREG_TO_REG, teach SimpleRegisterCoalescing to coalesce SUBREG_TO_REG instructions (which are similar to INSERT_SUBREG instructions), and teach the DAGCombiner to take advantage of this on targets which support it. This eliminates many redundant zero-extension operations on x86-64. This adds a new TargetLowering hook, isZExtFree. It's similar to isTruncateFree, except it only applies to actual definitions, and not no-op truncates which may not zero the high bits. Also, this adds a new optimization to SimplifyDemandedBits: transform operations like x+y into (zext (add (trunc x), (trunc y))) on targets where all the casts are no-ops. In contexts where the high part of the add is explicitly masked off, this allows the mask operation to be eliminated. Fix the DAGCombiner to avoid undoing these transformations to eliminate casts on targets where the casts are no-ops. Also, this adds a new two-address lowering heuristic. Since two-address lowering runs before coalescing, it helps to be able to look through copies when deciding whether commuting and/or three-address conversion are profitable. Also, fix a bug in LiveInterval::MergeInClobberRanges. It didn't handle the case that a clobber range extended both before and beyond an existing live range. In that case, multiple live ranges need to be added. This was exposed by the new subreg coalescing code. Remove 2008-05-06-SpillerBug.ll. It was bugpoint-reduced, and the spiller behavior it was looking for no longer occurrs with the new instruction selection. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68576 91177308-0d34-0410-b5e6-96231b3b80d8		2009-04-08 00:15:30 +00:00
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Analysis	use higher level APIs.	2009-04-03 00:02:39 +00:00
Archive	Add the private linkage.	2009-01-15 20:18:42 +00:00
AsmParser	Add support for embedded metadata to LLVM. This introduces two new types of	2009-04-04 07:22:01 +00:00
Bitcode	Teach llvm-bcanalyzer to skip over the header we use on LLVM IR files.	2009-04-06 20:54:32 +00:00
CodeGen	Implement support for using modeling implicit-zero-extension on x86-64	2009-04-08 00:15:30 +00:00
CompilerDriver	-write-graph now can be used with -o.	2009-03-27 12:57:14 +00:00
Debugger	Oops...I committed too much.	2009-03-13 04:39:26 +00:00
ExecutionEngine	Use CHAR_BIT instead of hard-coding 8 in several places where it	2009-04-01 18:45:54 +00:00
Linker	Apply ODR linkage changes accidentally dropped during	2009-03-08 13:35:23 +00:00
Support	Fix build on Linux.	2009-04-02 01:11:37 +00:00
System	hopefully fix an apparent build error on windows.	2009-04-01 02:03:38 +00:00
Target	Implement support for using modeling implicit-zero-extension on x86-64	2009-04-08 00:15:30 +00:00
Transforms	fix rdar://6762290, a crash compiling cxx filt with clang.	2009-04-07 05:03:34 +00:00
VMCore	fix style.	2009-04-07 19:45:59 +00:00
Makefile	Reorganize llvmc code.	2009-03-02 09:01:14 +00:00