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FastISel: Factor out common code; NFC intended

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This should be no functional change but for the record: For three cases
in X86FastISel this will change the order in which the FalseMBB and
TrueMBB of a conditional branch is addedd to the successor/predecessor
lists.

llvm-svn: 245997
This commit is contained in:
Matthias Braun 2015-08-26 01:38:00 +00:00
parent a3f0d5cebf
commit a64770afff
4 changed files with 27 additions and 69 deletions
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5
include/llvm/CodeGen/FastISel.h
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@ -468,6 +468,11 @@ protected:
/// immediate (fall-through) successor, and update the CFG.
void fastEmitBranch(MachineBasicBlock *MBB, DebugLoc DL);
/// Emit an unconditional branch to \p FalseMBB, obtains the branch weight
/// and adds TrueMBB and FalseMBB to the successor list.
void finishCondBranch(const BasicBlock *BranchBB, MachineBasicBlock *TrueMBB,
MachineBasicBlock *FalseMBB);
/// \brief Update the value map to include the new mapping for this
/// instruction, or insert an extra copy to get the result in a previous
/// determined register.

12
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -1408,6 +1408,18 @@ void FastISel::fastEmitBranch(MachineBasicBlock *MSucc, DebugLoc DbgLoc) {
FuncInfo.MBB->addSuccessor(MSucc, BranchWeight);
}
void FastISel::finishCondBranch(const BasicBlock *BranchBB,
MachineBasicBlock *TrueMBB,
MachineBasicBlock *FalseMBB) {
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BranchBB,
TrueMBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
fastEmitBranch(FalseMBB, DbgLoc);
}
/// Emit an FNeg operation.
bool FastISel::selectFNeg(const User *I) {
unsigned OpReg = getRegForValue(BinaryOperator::getFNegArgument(I));

45
lib/Target/AArch64/AArch64FastISel.cpp
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@ -2260,14 +2260,7 @@ bool AArch64FastISel::emitCompareAndBranch(const BranchInst *BI) {
MIB.addImm(TestBit);
MIB.addMBB(TBB);
// Obtain the branch weight and add the TrueBB to the successor list.
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TBB, BranchWeight);
fastEmitBranch(FBB, DbgLoc);
finishCondBranch(BI->getParent(), TBB, FBB);
return true;
}
@ -2342,14 +2335,7 @@ bool AArch64FastISel::selectBranch(const Instruction *I) {
.addImm(CC)
.addMBB(TBB);
// Obtain the branch weight and add the TrueBB to the successor list.
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TBB, BranchWeight);
fastEmitBranch(FBB, DbgLoc);
finishCondBranch(BI->getParent(), TBB, FBB);
return true;
}
} else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
@ -2380,14 +2366,7 @@ bool AArch64FastISel::selectBranch(const Instruction *I) {
.addImm(CC)
.addMBB(TBB);
// Obtain the branch weight and add the TrueBB to the successor list.
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TBB, BranchWeight);
fastEmitBranch(FBB, DbgLoc);
finishCondBranch(BI->getParent(), TBB, FBB);
return true;
}
} else if (const auto *CI = dyn_cast<ConstantInt>(BI->getCondition())) {
@ -2415,14 +2394,7 @@ bool AArch64FastISel::selectBranch(const Instruction *I) {
.addImm(CC)
.addMBB(TBB);
// Obtain the branch weight and add the TrueBB to the successor list.
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TBB, BranchWeight);
fastEmitBranch(FBB, DbgLoc);
finishCondBranch(BI->getParent(), TBB, FBB);
return true;
}
@ -2453,14 +2425,7 @@ bool AArch64FastISel::selectBranch(const Instruction *I) {
.addImm(CC)
.addMBB(TBB);
// Obtain the branch weight and add the TrueBB to the successor list.
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TBB, BranchWeight);
fastEmitBranch(FBB, DbgLoc);
finishCondBranch(BI->getParent(), TBB, FBB);
return true;
}

34
lib/Target/X86/X86FastISel.cpp
View File

@ -1431,17 +1431,7 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
.addMBB(TrueMBB);
}
// Obtain the branch weight and add the TrueBB to the successor list.
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TrueMBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
// Emits an unconditional branch to the FalseBB, obtains the branch
// weight, and adds it to the successor list.
fastEmitBranch(FalseMBB, DbgLoc);
finishCondBranch(BI->getParent(), TrueMBB, FalseMBB);
return true;
}
} else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
@ -1472,12 +1462,8 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(JmpOpc))
.addMBB(TrueMBB);
fastEmitBranch(FalseMBB, DbgLoc);
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TrueMBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
finishCondBranch(BI->getParent(), TrueMBB, FalseMBB);
return true;
}
}
@ -1492,12 +1478,7 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(BranchOpc))
.addMBB(TrueMBB);
fastEmitBranch(FalseMBB, DbgLoc);
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TrueMBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
finishCondBranch(BI->getParent(), TrueMBB, FalseMBB);
return true;
}
@ -1511,12 +1492,7 @@ bool X86FastISel::X86SelectBranch(const Instruction *I) {
.addReg(OpReg).addImm(1);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::JNE_1))
.addMBB(TrueMBB);
fastEmitBranch(FalseMBB, DbgLoc);
uint32_t BranchWeight = 0;
if (FuncInfo.BPI)
BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
TrueMBB->getBasicBlock());
FuncInfo.MBB->addSuccessor(TrueMBB, BranchWeight);
finishCondBranch(BI->getParent(), TrueMBB, FalseMBB);
return true;
}