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Simplify code a bit

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llvm-svn: 8301
This commit is contained in:
Chris Lattner 2003-09-01 20:24:06 +00:00
parent aeb98733eb
commit cd2980ec8c
1 changed files with 15 additions and 31 deletions
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46
lib/Target/Sparc/PeepholeOpts.cpp
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@ -16,11 +16,10 @@
//************************* Internal Functions *****************************/
inline void
static inline void
DeleteInstruction(MachineBasicBlock& mvec,
MachineBasicBlock::iterator& BBI,
const TargetMachine& target)
{
const TargetMachine& target) {
// Check if this instruction is in a delay slot of its predecessor.
if (BBI != mvec.begin()) {
const TargetInstrInfo& mii = target.getInstrInfo();
@ -43,12 +42,10 @@ DeleteInstruction(MachineBasicBlock& mvec,
//******************* Individual Peephole Optimizations ********************/
inline bool
RemoveUselessCopies(MachineBasicBlock& mvec,
MachineBasicBlock::iterator& BBI,
const TargetMachine& target)
{
const TargetMachine& target) {
if (target.getOptInfo().IsUselessCopy(*BBI)) {
DeleteInstruction(mvec, BBI, target);
return true;
@ -69,37 +66,27 @@ public:
virtual const char *getPassName() const { return "Peephole Optimization"; }
};
/* Apply a list of peephole optimizations to this machine instruction
* within its local context. They are allowed to delete MI or any
* instruction before MI, but not
*/
bool
PeepholeOpts::visit(MachineBasicBlock& mvec,
MachineBasicBlock::iterator BBI) const
{
bool changed = false;
// Apply a list of peephole optimizations to this machine instruction
// within its local context. They are allowed to delete MI or any
// instruction before MI, but not
//
bool PeepholeOpts::visit(MachineBasicBlock& mvec,
MachineBasicBlock::iterator BBI) const {
/* Remove redundant copy instructions */
changed |= RemoveUselessCopies(mvec, BBI, target);
if (BBI == mvec.end()) // nothing more to do!
return changed;
return changed;
return RemoveUselessCopies(mvec, BBI, target);
}
bool
PeepholeOpts::runOnBasicBlock(BasicBlock &BB)
{
bool PeepholeOpts::runOnBasicBlock(BasicBlock &BB) {
// Get the machine instructions for this BB
// FIXME: MachineBasicBlock::get() is deprecated, hence inlining the function
const Function *F = BB.getParent();
MachineFunction &MF = MachineFunction::get(F);
MachineBasicBlock *MBB = NULL;
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
if (I->getBasicBlock() == &BB)
MBB = I;
}
assert(MBB && "MachineBasicBlock object not found for specified block!");
MachineBasicBlock &mvec = *MBB;
@ -108,8 +95,7 @@ PeepholeOpts::runOnBasicBlock(BasicBlock &BB)
// Insertions or deletions *before* MI are not safe.
//
for (MachineBasicBlock::reverse_iterator RI=mvec.rbegin(),
RE=mvec.rend(); RI != RE; )
{
RE=mvec.rend(); RI != RE; ) {
MachineBasicBlock::iterator BBI = RI.base()-1; // save before incr
++RI; // pre-increment to delete MI or after it
visit(mvec, BBI);
@ -123,8 +109,6 @@ PeepholeOpts::runOnBasicBlock(BasicBlock &BB)
// createPeepholeOptsPass - Public entrypoint for peephole optimization
// and this file as a whole...
//
FunctionPass*
createPeepholeOptsPass(TargetMachine &T)
{
FunctionPass* createPeepholeOptsPass(TargetMachine &T) {
return new PeepholeOpts(T);
}