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11 Commits

Author SHA1 Message Date
Evan Cheng 1ef0660836 It's not safe eliminate copies where src and dst have different sub-register indices. 
llvm-svn: 103450
 2010-05-11 00:20:03 +00:00
Evan Cheng d6908dc4a2 It's not safe to propagate implicit_def that defines part of a register. 
llvm-svn: 103436
 2010-05-10 21:25:30 +00:00
Jakob Stoklund Olesen 2988d573e5 Fix PR6300. 
A virtual register can be used before it is defined in the same MBB if the MBB
is part of a loop. Teach the implicit-def pass about this case.

llvm-svn: 96279
 2010-02-15 22:03:29 +00:00
Chris Lattner b06015aa69 move target-independent opcodes out of TargetInstrInfo 
into TargetOpcodes.h.  #include the new TargetOpcodes.h
into MachineInstr.  Add new inline accessors (like isPHI())
to MachineInstr, and start using them throughout the 
codebase.

llvm-svn: 95687
 2010-02-09 19:54:29 +00:00
Jakob Stoklund Olesen c7c89b8325 Fix small bug in handling instructions with more than one implicitly defined operand. 
ProcessImplicitDefs would only mark one operand per instruction with <undef>.
This fixed PR6086.

llvm-svn: 95319
 2010-02-04 18:46:28 +00:00
David Greene d7c266bb9c Change errs() to dbgs(). 
llvm-svn: 92567
 2010-01-05 01:24:28 +00:00
Evan Cheng 595a16300c When all defs of a vr are implicit_def, delete all of the defs. 
llvm-svn: 89905
 2009-11-26 00:32:36 +00:00
Evan Cheng 44df27e964 ProcessImplicitDefs should watch out for invalidated iterator and extra implicit operands on copies. 
llvm-svn: 89880
 2009-11-25 21:13:39 +00:00
Evan Cheng 11bf4493d4 For some targets, a copy can use a register multiple times, e.g. ppc. 
llvm-svn: 88895
 2009-11-16 05:52:06 +00:00
Lang Hames 01f31c0a48 Fixes the bug exposed by Anton's test case in PR 5495: 
Make sure when ProcessImplicitDefs removes a copy which kills its source reg that it
removes the copy from said reg's Kills list.

llvm-svn: 88881
 2009-11-16 02:07:31 +00:00
Lang Hames 05fb9637f6 The Indexes Patch. 
This introduces a new pass, SlotIndexes, which is responsible for numbering
instructions for register allocation (and other clients). SlotIndexes numbering
is designed to match the existing scheme, so this patch should not cause any
changes in the generated code.

For consistency, and to avoid naming confusion, LiveIndex has been renamed
SlotIndex.

The processImplicitDefs method of the LiveIntervals analysis has been moved
into its own pass so that it can be run prior to SlotIndexes. This was
necessary to match the existing numbering scheme.

llvm-svn: 85979
 2009-11-03 23:52:08 +00:00