Andrew Trick c4c5a1d526 Allow MachineCSE to coalesce trivial subregister copies the same way that it coalesces normal copies. ... Without this, MachineCSE is powerless to handle redundant operations with truncated source operands. This required fixing the 2-addr pass to handle tied subregisters. It isn't clear what combinations of subregisters can legally be tied, but the simple case of truncated source operands is now safely handled: %vreg11<def> = COPY %vreg1:sub_32bit; GR32:%vreg11 GR64:%vreg1 %vreg12<def> = COPY %vreg2:sub_32bit; GR32:%vreg12 GR64:%vreg2 %vreg13<def,tied1> = ADD32rr %vreg11<tied0>, %vreg12<kill>, %EFLAGS<imp-def> Test case: cse-add-with-overflow.ll. This exposed an existing bug in PPCInstrInfo::commuteInstruction. Thanks to Rafael for the test case: PowerPC/crash.ll. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197465 91177308-0d34-0410-b5e6-96231b3b80d8		2013-12-17 04:50:45 +00:00
..
Analysis	[block-freq] Teach branch probability how to return the edge weight in between a BasicBlock and one of its successors.	2013-12-14 02:24:25 +00:00
AsmParser	Debug Info: drop debug info via upgrading path if version number does not match.	2013-12-02 21:29:56 +00:00
Bitcode	Remove unused value.	2013-12-07 02:27:52 +00:00
CodeGen	Allow MachineCSE to coalesce trivial subregister copies the same way that it coalesces normal copies.	2013-12-17 04:50:45 +00:00
DebugInfo	DebugInfo: Move type units into the debug_types section with appropriate comdat grouping and type unit headers	2013-12-13 21:33:40 +00:00
ExecutionEngine	Prune redundant dependencies in LLVMBuild.txt.	2013-12-11 00:30:57 +00:00
IR	Revert r197438 and r197447 until we figure out how to avoid circular dependency at link time	2013-12-17 01:19:59 +00:00
IRReader	[llvm-c] Expose IRReader interface	2013-11-06 09:21:15 +00:00
Linker	Revert "Move copying of global initializers below the cloning of functions."	2013-11-09 00:43:18 +00:00
LTO	Add TargetLibraryInfo in LTO passes builder	2013-12-12 01:37:39 +00:00
MC	DebugInfo: Move type units into the debug_types section with appropriate comdat grouping and type unit headers	2013-12-13 21:33:40 +00:00
Object	Fix a pair of array index checks.	2013-12-06 02:33:38 +00:00
Option	Avoid buffer copies when a Twine already is a StringRef.	2013-12-03 18:18:28 +00:00
Support	Revert r197438 and r197447 until we figure out how to avoid circular dependency at link time	2013-12-17 01:19:59 +00:00
TableGen	Fix most memory leaks in tablegen.	2013-10-31 04:07:41 +00:00
Target	Allow MachineCSE to coalesce trivial subregister copies the same way that it coalesces normal copies.	2013-12-17 04:50:45 +00:00
Transforms	LoopVectorizer: Don't if-convert constant expressions that can trap	2013-12-17 01:11:01 +00:00
CMakeLists.txt	Move LTO support library to a component, allowing it to be tested	2013-09-24 23:52:22 +00:00
LLVMBuild.txt	Move LTO support library to a component, allowing it to be tested	2013-09-24 23:52:22 +00:00
Makefile	Reformat Makefile. No other changes.	2013-10-30 04:03:03 +00:00