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Simplify the coalescer (finally!) by making LiveIntervals::processImplicitDefs a little more aggressive and teaching liveintervals to make use of isUndef marker on MachineOperands.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76223 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-07-17 19:43:40 +00:00
parent 1bd9f58d6d
commit d129d73b72
3 changed files with 46 additions and 159 deletions
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4
lib/CodeGen/SimpleRegisterCoalescing.h
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@@ -277,10 +277,6 @@ namespace llvm {
/// subregister.
void UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg, unsigned SubIdx);
/// RemoveDeadImpDef - Remove implicit_def instructions which are
/// "re-defining" registers due to insert_subreg coalescing. e.g.
void RemoveDeadImpDef(unsigned Reg, LiveInterval &LI);
/// RemoveUnnecessaryKills - Remove kill markers that are no longer accurate
/// due to live range lengthening as the result of coalescing.
void RemoveUnnecessaryKills(unsigned Reg, LiveInterval &LI);