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Handle overlapping regunit intervals in LiveIntervals::addKillFlags().

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We will soon allow virtual register live ranges to overlap regunit live
ranges when the physreg is defined as a copy of the virtreg:

  %EAX = COPY %vreg5
  FOO %vreg5
  BAR %EAX<kill>

There is no real interference since %vreg5 and %EAX have the same value
where they overlap.

This patch prevents addKillFlags from adding virtreg kill flags to FOO
where the assigned physreg is overlapping the virtual register live
range.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163335 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-09-06 18:15:18 +00:00
parent f9dff0e0e4
commit e617ccb80d
3 changed files with 46 additions and 4 deletions
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2
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@@ -252,7 +252,7 @@ namespace llvm {
/// addKillFlags - Add kill flags to any instruction that kills a virtual
/// register.
void addKillFlags();
void addKillFlags(const VirtRegMap*);
/// handleMove - call this method to notify LiveIntervals that
/// instruction 'mi' has been moved within a basic block. This will update