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X86FastISel support for conditional branches.

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llvm-svn: 55816
This commit is contained in:
Dan Gohman 2008-09-05 01:06:14 +00:00
parent 6d5b72d45a
commit 783f38e056
1 changed files with 39 additions and 1 deletions
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40
lib/Target/X86/X86FastISel.cpp
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@ -19,7 +19,7 @@
#include "X86RegisterInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
#include "llvm/InstrTypes.h"
#include "llvm/Instructions.h"
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/MachineConstantPool.h"
@ -53,6 +53,10 @@ private:
bool X86SelectCmp(Instruction *I);
bool X86SelectZExt(Instruction *I);
bool X86SelectBranch(Instruction *I);
unsigned TargetSelectConstantPoolLoad(Constant *C, MachineConstantPool* MCP);
};
@ -388,6 +392,36 @@ bool X86FastISel::X86SelectCmp(Instruction *I) {
return true;
}
bool X86FastISel::X86SelectZExt(Instruction *I) {
// Special-case hack: The only i1 values we know how to produce currently
// set the upper bits of an i8 value to zero.
if (I->getType() == Type::Int8Ty &&
I->getOperand(0)->getType() == Type::Int1Ty) {
unsigned ResultReg = getRegForValue(I->getOperand(0));
UpdateValueMap(I, ResultReg);
return true;
}
return false;
}
bool X86FastISel::X86SelectBranch(Instruction *I) {
BranchInst *BI = cast<BranchInst>(I);
// Unconditional branches are selected by tablegen-generated code.
unsigned OpReg = getRegForValue(BI->getCondition());
MachineBasicBlock *TrueMBB = MBBMap[BI->getSuccessor(0)];
MachineBasicBlock *FalseMBB = MBBMap[BI->getSuccessor(1)];
BuildMI(MBB, TII.get(X86::TEST8rr)).addReg(OpReg).addReg(OpReg);
BuildMI(MBB, TII.get(X86::JNE)).addMBB(TrueMBB);
BuildMI(MBB, TII.get(X86::JMP)).addMBB(FalseMBB);
MBB->addSuccessor(TrueMBB);
MBB->addSuccessor(FalseMBB);
return true;
}
bool
X86FastISel::TargetSelectInstruction(Instruction *I) {
switch (I->getOpcode()) {
@ -399,6 +433,10 @@ X86FastISel::TargetSelectInstruction(Instruction *I) {
case Instruction::ICmp:
case Instruction::FCmp:
return X86SelectCmp(I);
case Instruction::ZExt:
return X86SelectZExt(I);
case Instruction::Br:
return X86SelectBranch(I);
}
return false;