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Add manual ISD::OR fastisel selection routines. TableGen is no longer autogen them after 93152 and 93191. 

llvm-svn: 93204
This commit is contained in:
Evan Cheng 2010-01-11 22:59:27 +00:00
parent 0b62cc6dc4
commit 42b07e9600
2 changed files with 43 additions and 1 deletions
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42
llvm/lib/Target/X86/X86FastISel.cpp
View File

@ -104,6 +104,8 @@ private:
bool X86SelectBranch(Instruction *I);
bool X86SelectOR(Instruction *I);
bool X86SelectShift(Instruction *I);
bool X86SelectSelect(Instruction *I);
@ -945,6 +947,44 @@ bool X86FastISel::X86SelectBranch(Instruction *I) {
return true;
}
bool X86FastISel::X86SelectOR(Instruction *I) {
// FIXME: This is necessary because tablegen stopped generate fastisel
// patterns after 93152 and 93191 (which turns OR to ADD if the set
// bits in the source operands are known not to overlap).
const TargetRegisterClass *RC = NULL;
unsigned OpReg = 0, OpImm = 0;
if (I->getType()->isInteger(16)) {
RC = X86::GR16RegisterClass;
OpReg = X86::OR16rr; OpImm = X86::OR16ri;
} else if (I->getType()->isInteger(32)) {
RC = X86::GR32RegisterClass;
OpReg = X86::OR32rr; OpImm = X86::OR32ri;
} else if (I->getType()->isInteger(64)) {
RC = X86::GR64RegisterClass;
OpReg = X86::OR32rr; OpImm = X86::OR32ri;
} else
return false;
unsigned Op0Reg = getRegForValue(I->getOperand(0));
if (Op0Reg == 0) return false;
if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
unsigned ResultReg = createResultReg(RC);
BuildMI(MBB, DL, TII.get(OpImm), ResultReg).addReg(Op0Reg)
.addImm(CI->getZExtValue());
UpdateValueMap(I, ResultReg);
return true;
}
unsigned Op1Reg = getRegForValue(I->getOperand(1));
if (Op1Reg == 0) return false;
unsigned ResultReg = createResultReg(RC);
BuildMI(MBB, DL, TII.get(OpReg), ResultReg).addReg(Op0Reg).addReg(Op1Reg);
UpdateValueMap(I, ResultReg);
return true;
}
bool X86FastISel::X86SelectShift(Instruction *I) {
unsigned CReg = 0, OpReg = 0, OpImm = 0;
const TargetRegisterClass *RC = NULL;
@ -1534,6 +1574,8 @@ X86FastISel::TargetSelectInstruction(Instruction *I) {
return X86SelectBranch(I);
case Instruction::Call:
return X86SelectCall(I);
case Instruction::Or:
return X86SelectOR(I);
case Instruction::LShr:
case Instruction::AShr:
case Instruction::Shl:

2
llvm/test/CodeGen/X86/fast-isel.ll
View File

@ -14,7 +14,7 @@ fast:
%t1 = mul i32 %t0, %s
%t2 = sub i32 %t1, %s
%t3 = and i32 %t2, %s
%t4 = xor i32 %t3, 3
%t4 = or i32 %t3, %s
%t5 = xor i32 %t4, %s
%t6 = add i32 %t5, 2
%t7 = getelementptr i32* %y, i32 1