[PATCH] D12295: Use BranchProbability::scale() to scale an integer with a probability in ARMBaseInstrInfo.cpp,
Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Aug 26 16:19:02 PDT 2015
This revision was automatically updated to reflect the committed changes.
Closed by commit rL246106: [ARM] Use BranchProbability::scale() to scale an integer with a probability… (authored by conghou).
Changed prior to commit:
http://reviews.llvm.org/D12295?vs=33002&id=33268#toc
Repository:
rL LLVM
http://reviews.llvm.org/D12295
Files:
llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
Index: llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
===================================================================
--- llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -1670,8 +1670,7 @@
}
// Attempt to estimate the relative costs of predication versus branching.
- unsigned UnpredCost = Probability.getNumerator() * NumCycles;
- UnpredCost /= Probability.getDenominator();
+ unsigned UnpredCost = Probability.scale(NumCycles);
UnpredCost += 1; // The branch itself
UnpredCost += Subtarget.getMispredictionPenalty() / 10;
@@ -1688,13 +1687,8 @@
return false;
// Attempt to estimate the relative costs of predication versus branching.
- unsigned TUnpredCost = Probability.getNumerator() * TCycles;
- TUnpredCost /= Probability.getDenominator();
-
- uint32_t Comp = Probability.getDenominator() - Probability.getNumerator();
- unsigned FUnpredCost = Comp * FCycles;
- FUnpredCost /= Probability.getDenominator();
-
+ unsigned TUnpredCost = Probability.scale(TCycles);
+ unsigned FUnpredCost = Probability.getCompl().scale(FCycles);
unsigned UnpredCost = TUnpredCost + FUnpredCost;
UnpredCost += 1; // The branch itself
UnpredCost += Subtarget.getMispredictionPenalty() / 10;
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