6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-28 03:25:23 +00:00
Code Issues Projects Releases Wiki Activity

Pull predecessor and successor iterators out of the CFG*.h files, and plop them into

Browse Source 
the BasicBlock class where they should be.  pred_begin/pred_end become methods on BasicBlock,
and the cfg namespace isn't used anymore.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@691 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2001-10-01 13:19:53 +00:00
parent 711774e169
commit f0604b84c7
16 changed files with 176 additions and 368 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
lib/Transforms/Scalar/DCE.cpp
View File

@@ -31,11 +31,8 @@
#include "llvm/iTerminators.h"
#include "llvm/iOther.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CFG.h"
#include <algorithm>
using namespace cfg;
struct ConstPoolDCE {
enum { EndOffs = 0 };
static bool isDCEable(const ConstPoolVal *CPV) {
@@ -82,15 +79,15 @@ static bool RemoveUnusedDefs(Container &Vals, DCEController DCEControl) {
// things in a basic block, if they are present.
//
static bool RemoveSingularPHIs(BasicBlock *BB) {
pred_iterator PI(pred_begin(BB));
if (PI == pred_end(BB) || ++PI != pred_end(BB))
BasicBlock::pred_iterator PI(BB->pred_begin());
if (PI == BB->pred_end() || ++PI != BB->pred_end())
return false; // More than one predecessor...
Instruction *I = BB->front();
if (!I->isPHINode()) return false; // No PHI nodes
//cerr << "Killing PHIs from " << BB;
//cerr << "Pred #0 = " << *pred_begin(BB);
//cerr << "Pred #0 = " << *BB->pred_begin();
//cerr << "Method == " << BB->getParent();
@@ -128,7 +125,7 @@ static void PropogatePredecessorsForPHIs(BasicBlock *BB, BasicBlock *Succ) {
// If there is more than one predecessor, and there are PHI nodes in
// the successor, then we need to add incoming edges for the PHI nodes
//
const vector<BasicBlock*> BBPreds(pred_begin(BB), pred_end(BB));
const vector<BasicBlock*> BBPreds(BB->pred_begin(), BB->pred_end());
BasicBlock::iterator I = Succ->begin();
do { // Loop over all of the PHI nodes in the successor BB
@@ -166,13 +163,13 @@ bool opt::SimplifyCFG(Method::iterator &BBIt) {
// Remove basic blocks that have no predecessors... which are unreachable.
if (pred_begin(BB) == pred_end(BB) &&
if (BB->pred_begin() == BB->pred_end() &&
!BB->hasConstantPoolReferences()) {
//cerr << "Removing BB: \n" << BB;
// Loop through all of our successors and make sure they know that one
// of their predecessors is going away.
for_each(succ_begin(BB), succ_end(BB),
for_each(BB->succ_begin(), BB->succ_end(),
std::bind2nd(std::mem_fun(&BasicBlock::removePredecessor), BB));
while (!BB->empty()) {
@@ -193,11 +190,11 @@ bool opt::SimplifyCFG(Method::iterator &BBIt) {
// Check to see if this block has no instructions and only a single
// successor. If so, replace block references with successor.
succ_iterator SI(succ_begin(BB));
if (SI != succ_end(BB) && ++SI == succ_end(BB)) { // One succ?
BasicBlock::succ_iterator SI(BB->succ_begin());
if (SI != BB->succ_end() && ++SI == BB->succ_end()) { // One succ?
Instruction *I = BB->front();
if (I->isTerminator()) { // Terminator is the only instruction!
BasicBlock *Succ = *succ_begin(BB); // There is exactly one successor
BasicBlock *Succ = *BB->succ_begin(); // There is exactly one successor
//cerr << "Killing Trivial BB: \n" << BB;
if (Succ != BB) { // Arg, don't hurt infinite loops!
@@ -223,16 +220,16 @@ bool opt::SimplifyCFG(Method::iterator &BBIt) {
// Merge basic blocks into their predecessor if there is only one pred,
// and if there is only one successor of the predecessor.
pred_iterator PI(pred_begin(BB));
if (PI != pred_end(BB) && *PI != BB && // Not empty? Not same BB?
++PI == pred_end(BB) && !BB->hasConstantPoolReferences()) {
BasicBlock *Pred = *pred_begin(BB);
BasicBlock::pred_iterator PI(BB->pred_begin());
if (PI != BB->pred_end() && *PI != BB && // Not empty? Not same BB?
++PI == BB->pred_end() && !BB->hasConstantPoolReferences()) {
BasicBlock *Pred = *BB->pred_begin();
TerminatorInst *Term = Pred->getTerminator();
assert(Term != 0 && "malformed basic block without terminator!");
// Does the predecessor block only have a single successor?
succ_iterator SI(succ_begin(Pred));
if (++SI == succ_end(Pred)) {
BasicBlock::succ_iterator SI(Pred->succ_begin());
if (++SI == Pred->succ_end()) {
//cerr << "Merging: " << BB << "into: " << Pred;
// Delete the unconditianal branch from the predecessor...