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[block-freq] Add a right shift to BlockFrequency that saturates at 1.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197302 91177308-0d34-0410-b5e6-96231b3b80d8
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Michael Gottesman
2013-12-14 02:24:22 +00:00
parent 7cc5f793bc
commit 1b98ef1c19
3 changed files with 23 additions and 0 deletions
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include/llvm/Support/BlockFrequency.h
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@@ -55,6 +55,9 @@ public:
BlockFrequency &operator+=(const BlockFrequency &Freq);
const BlockFrequency operator+(const BlockFrequency &Freq) const;
/// \brief Shift block frequency to the right by count digits saturating to 1.
BlockFrequency &operator>>=(const unsigned count);
/// \brief Scale the given BlockFrequency by N/D. Return the remainder from
/// the division by D. Upon overflow, the routine will saturate.
uint32_t scale(const BranchProbability &Prob);