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Allow getBlockFreq to return 0.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135742 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakub Staszak
2011-07-22 02:24:57 +00:00
parent 558cc5a914
commit 23f34f1c22
5 changed files with 19 additions and 20 deletions
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8
lib/CodeGen/MachineBlockFrequency.cpp
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@@ -50,10 +50,10 @@ bool MachineBlockFrequency::runOnMachineFunction(MachineFunction &F) {
return false;
}
/// getblockFreq - Return block frequency. Never return 0, value must be
/// positive. Please note that initial frequency is equal to 1024. It means that
/// we should not rely on the value itself, but only on the comparison to the
/// other block frequencies. We do this to avoid using of floating points.
/// getblockFreq - Return block frequency. Return 0 if we don't have the
/// information. Please note that initial frequency is equal to 1024. It means
/// that we should not rely on the value itself, but only on the comparison to
/// the other block frequencies. We do this to avoid using of floating points.
///
uint32_t MachineBlockFrequency::getBlockFreq(MachineBasicBlock *MBB) {
return MBFI->getBlockFreq(MBB);