6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-20 10:24:12 +00:00
Code Issues Projects Releases Wiki Activity

Remove 'unwinds to' support from mainline. This patch undoes r47802 r47989

Browse Source 
r48047 r48084 r48085 r48086 r48088 r48096 r48099 r48109 and r48123.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2008-04-25 16:53:59 +00:00
parent 419ace9bda
commit 280a6e607d
28 changed files with 61 additions and 338 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
lib/Transforms/Utils/LoopSimplify.cpp
View File

@ -125,17 +125,18 @@ bool LoopSimplify::runOnFunction(Function &F) {
if (LI->getLoopFor(BB)) continue;
bool BlockUnreachable = false;
TerminatorInst *TI = BB->getTerminator();
// Check to see if any successors of this block are non-loop-header loops
// that are not the header.
for (succ_iterator I = succ_begin(BB), E = succ_end(BB); I != E; ++I) {
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i) {
// If this successor is not in a loop, BB is clearly ok.
Loop *L = LI->getLoopFor(*I);
Loop *L = LI->getLoopFor(TI->getSuccessor(i));
if (!L) continue;
// If the succ is the loop header, and if L is a top-level loop, then this
// is an entrance into a loop through the header, which is also ok.
if (L->getHeader() == *I && L->getParentLoop() == 0)
if (L->getHeader() == TI->getSuccessor(i) && L->getParentLoop() == 0)
continue;
// Otherwise, this is an entrance into a loop from some place invalid.
@ -153,11 +154,10 @@ bool LoopSimplify::runOnFunction(Function &F) {
// loop by replacing the terminator.
// Remove PHI entries from the successors.
for (succ_iterator I = succ_begin(BB), E = succ_end(BB); I != E; ++I)
(*I)->removePredecessor(BB);
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
TI->getSuccessor(i)->removePredecessor(BB);
// Add a new unreachable instruction before the old terminator.
TerminatorInst *TI = BB->getTerminator();
new UnreachableInst(TI);
// Delete the dead terminator.
@ -576,15 +576,12 @@ void LoopSimplify::InsertUniqueBackedgeBlock(Loop *L) {
}
// Now that all of the PHI nodes have been inserted and adjusted, modify the
// backedge blocks to branch to the BEBlock instead of the header.
// backedge blocks to just to the BEBlock instead of the header.
for (unsigned i = 0, e = BackedgeBlocks.size(); i != e; ++i) {
TerminatorInst *TI = BackedgeBlocks[i]->getTerminator();
for (unsigned Op = 0, e = TI->getNumSuccessors(); Op != e; ++Op)
if (TI->getSuccessor(Op) == Header)
TI->setSuccessor(Op, BEBlock);
if (BackedgeBlocks[i]->getUnwindDest() == Header)
BackedgeBlocks[i]->setUnwindDest(BEBlock);
}
//===--- Update all analyses which we must preserve now -----------------===//