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| author | Juergen Ributzka <juergen@apple.com> | 2014-06-13 00:45:11 +0000 |
|---|---|---|
| committer | Juergen Ributzka <juergen@apple.com> | 2014-06-13 00:45:11 +0000 |
| commit | 454d374e37ebebf7a2746093d8543197516b95d0 (patch) | |
| tree | f9163af777d6a298711f4fc54cb7d496373ef4cd /llvm/lib/Target/X86 | |
| parent | 030294e4c5c609d2f411947241a1c221db218837 (diff) | |
| download | bcm5719-llvm-454d374e37ebebf7a2746093d8543197516b95d0.tar.gz bcm5719-llvm-454d374e37ebebf7a2746093d8543197516b95d0.zip | |
[FastISel][X86] - Add branch weights
Add branch weights to branch instructions, so that the following passes can
optimize based on it (i.e. basic block ordering).
llvm-svn: 210863
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/X86FastISel.cpp | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp index e8f8805ee1a..e041b504af9 100644 --- a/llvm/lib/Target/X86/X86FastISel.cpp +++ b/llvm/lib/Target/X86/X86FastISel.cpp @@ -20,6 +20,7 @@ #include "X86RegisterInfo.h" #include "X86Subtarget.h" #include "X86TargetMachine.h" +#include "llvm/Analysis/BranchProbabilityInfo.h" #include "llvm/CodeGen/Analysis.h" #include "llvm/CodeGen/FastISel.h" #include "llvm/CodeGen/FunctionLoweringInfo.h" @@ -1206,7 +1207,11 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) { } FastEmitBranch(FalseMBB, DbgLoc); - FuncInfo.MBB->addSuccessor(TrueMBB); + uint32_t BranchWeight = 0; + if (FuncInfo.BPI) + BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(), + TrueMBB->getBasicBlock()); + FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight); return true; } } else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) { @@ -1238,7 +1243,11 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) { BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(JmpOpc)) .addMBB(TrueMBB); FastEmitBranch(FalseMBB, DbgLoc); - FuncInfo.MBB->addSuccessor(TrueMBB); + uint32_t BranchWeight = 0; + if (FuncInfo.BPI) + BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(), + TrueMBB->getBasicBlock()); + FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight); return true; } } @@ -1255,7 +1264,11 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) { BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::JNE_4)) .addMBB(TrueMBB); FastEmitBranch(FalseMBB, DbgLoc); - FuncInfo.MBB->addSuccessor(TrueMBB); + uint32_t BranchWeight = 0; + if (FuncInfo.BPI) + BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(), + TrueMBB->getBasicBlock()); + FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight); return true; } |
