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Fix PR2590 by making PatternSortingPredicate actually be

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ordered correctly.  Previously it would get in trouble when
two patterns were too similar and give them nondet ordering.
We force this by using the record ID order as a fallback.

The testsuite diff is due to alpha patterns being ordered
slightly differently, the change is a semantic noop afaict:

< 	lda $0,-100($16)
---
> 	subq $16,100,$0



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97509 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-03-01 22:09:11 +00:00
parent f94bc54757
commit 117ccb7e51
5 changed files with 23 additions and 10 deletions
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utils/TableGen/DAGISelEmitter.cpp
+8 -2
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@@ -174,8 +174,14 @@ struct PatternSortingPredicate {
if (LHSCost < RHSCost) return true;
if (LHSCost > RHSCost) return false;
return getResultPatternSize(LHS->getDstPattern(), CGP) <
getResultPatternSize(RHS->getDstPattern(), CGP);
unsigned LHSPatSize = getResultPatternSize(LHS->getDstPattern(), CGP);
unsigned RHSPatSize = getResultPatternSize(RHS->getDstPattern(), CGP);
if (LHSPatSize < RHSPatSize) return true;
if (LHSPatSize > RHSPatSize) return false;
// Sort based on the UID of the pattern, giving us a deterministic ordering.
assert(LHS->ID != RHS->ID);
return LHS->ID < RHS->ID;
}
};
}