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Stabilize the order of live intervals in the priority_queue used by the

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linear scan reg alloc.  This fixes a problem I ran into where extracting
a function from a larger file caused the generated code to change (masking
the problem I was trying to debug) because the allocator behaved differently.

This changes the results for two X86 regression checks.  stack-color-with-reg
is improved, with one less instruction, but pr3495 is worse, with one more
copy.  As far as I can tell, these tests were just getting lucky or unlucky,
so I've changed the expected results.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81060 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-09-05 01:19:16 +00:00
parent bd1d6a8ce1
commit da4ae4be5b
3 changed files with 8 additions and 5 deletions
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5
include/llvm/CodeGen/LiveInterval.h
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@ -774,7 +774,10 @@ namespace llvm {
void ComputeJoinedWeight(const LiveInterval &Other);
bool operator<(const LiveInterval& other) const {
return beginIndex() < other.beginIndex();
const MachineInstrIndex &thisIndex = beginIndex();
const MachineInstrIndex &otherIndex = other.beginIndex();
return (thisIndex < otherIndex ||
(thisIndex == otherIndex && reg < other.reg));
}
void print(raw_ostream &OS, const TargetRegisterInfo *TRI = 0) const;