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ADd support for undef and unreachable

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-16 18:13:47 +00:00
parent 30483b0c84
commit 289a49ab7d
1 changed files with 8 additions and 4 deletions
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12
lib/Target/PowerPC/PPC32ISelSimple.cpp
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@ -237,9 +237,10 @@ namespace {
// Visitation methods for various instructions. These methods simply emit
// fixed PowerPC code for each instruction.
// Control flow operators
// Control flow operators.
void visitReturnInst(ReturnInst &RI);
void visitBranchInst(BranchInst &BI);
void visitUnreachableInst(UnreachableInst &UI) {}
struct ValueRecord {
Value *Val;
@ -575,6 +576,10 @@ void PPC32ISel::copyGlobalBaseToRegister(MachineBasicBlock *MBB,
void PPC32ISel::copyConstantToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
Constant *C, unsigned R) {
if (isa<UndefValue>(C)) {
BuildMI(*MBB, IP, PPC::IMPLICIT_DEF, 0, R);
return;
}
if (C->getType()->isIntegral()) {
unsigned Class = getClassB(C->getType());
@ -2117,9 +2122,8 @@ void PPC32ISel::emitBinaryConstOperation(MachineBasicBlock *MBB,
// xor X, -1 -> not X
if (Opcode == 4) {
ConstantSInt *CSI = dyn_cast<ConstantSInt>(Op1);
ConstantUInt *CUI = dyn_cast<ConstantUInt>(Op1);
if ((CSI && CSI->isAllOnesValue()) || (CUI && CUI->isAllOnesValue())) {
ConstantInt *CI = dyn_cast<ConstantSInt>(Op1);
if (CI && CI->isAllOnesValue()) {
BuildMI(*MBB, IP, PPC::NOR, 2, DestReg).addReg(Op0Reg).addReg(Op0Reg);
return;
}