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[FastISel][X86] - Add branch weights

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Add branch weights to branch instructions, so that the following passes can
optimize based on it (i.e. basic block ordering).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210863 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka
2014-06-13 00:45:11 +00:00
parent f7a2d5e387
commit 7f8d138f50
3 changed files with 41 additions and 5 deletions
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19
lib/Target/X86/X86FastISel.cpp
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@@ -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;
}