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Make the unreachable probability much much heavier. The previous

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probability wouldn't be considered "hot" in some weird loop structures
or other compounding probability patterns. This makes it much harder to
confuse, but isn't really a principled fix. I'd actually like it if we
could model a zero probability, as it would make this much easier to
reason about. Suggestions for how to do this better are welcome.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147142 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2011-12-22 09:26:37 +00:00
parent 3963d617b3
commit 51f40a725b
2 changed files with 12 additions and 11 deletions
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5
lib/Analysis/BranchProbabilityInfo.cpp
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@@ -65,8 +65,9 @@ static const uint32_t UR_TAKEN_WEIGHT = 1;
///
/// This is the weight for a branch not being taken toward a block that
/// terminates (eventually) in unreachable. Such a branch is essentially never
/// taken.
static const uint32_t UR_NONTAKEN_WEIGHT = 1023;
/// taken. Set the weight to an absurdly high value so that nested loops don't
/// easily subsume it.
static const uint32_t UR_NONTAKEN_WEIGHT = 1024*1024 - 1;
static const uint32_t PH_TAKEN_WEIGHT = 20;
static const uint32_t PH_NONTAKEN_WEIGHT = 12;