RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2024-12-28 15:33:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Enhance the assertion mechanisms in place to make it easier to catch

Browse Source 
when we fail to place all the blocks of a loop. Currently this is
happening for unnatural loops, and this logic helps more immediately
point to the problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144504 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2011-11-13 21:39:51 +00:00
parent 2debd48ca7
commit 10252db69b
1 changed files with 28 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
lib/CodeGen/MachineBlockPlacement.cpp
View File

@ -440,6 +440,13 @@ void MachineBlockPlacement::buildChain(
if (!BestSucc)
BestSucc = selectBestSuccessor(BB, Chain, BlockFilter);
if (BestSucc) {
// Zero out LoopPredecessors for the successor we're about to merge. We
// do this here instead of during the merge to catch cases where we
// didn't *intend* to merge despite non-zero loop predecessors.
BlockToChain[BestSucc]->LoopPredecessors = 0;
}
// If an immediate successor isn't available, look for the best viable
// block among those we've identified as not violating the loop's CFG at
// this point. This won't be a fallthrough, but it will increase locality.
@ -510,25 +517,34 @@ void MachineBlockPlacement::buildLoopChains(MachineFunction &F,
buildChain(*L.block_begin(), LoopChain, BlockWorkList, &LoopBlockSet);
DEBUG({
if (LoopChain.LoopPredecessors)
// Crash at the end so we get all of the debugging output first.
bool BadLoop = false;
if (LoopChain.LoopPredecessors) {
BadLoop = true;
dbgs() << "Loop chain contains a block without its preds placed!\n"
<< " Loop header: " << getBlockName(*L.block_begin()) << "\n"
<< " Chain header: " << getBlockName(*LoopChain.begin()) << "\n";
}
for (BlockChain::iterator BCI = LoopChain.begin(), BCE = LoopChain.end();
BCI != BCE; ++BCI)
if (!LoopBlockSet.erase(*BCI))
if (!LoopBlockSet.erase(*BCI)) {
BadLoop = true;
dbgs() << "Loop chain contains a block not contained by the loop!\n"
<< " Loop header: " << getBlockName(*L.block_begin()) << "\n"
<< " Chain header: " << getBlockName(*LoopChain.begin()) << "\n"
<< " Bad block: " << getBlockName(*BCI) << "\n";
}
if (!LoopBlockSet.empty())
if (!LoopBlockSet.empty()) {
BadLoop = true;
for (SmallPtrSet<MachineBasicBlock *, 16>::iterator LBI = LoopBlockSet.begin(), LBE = LoopBlockSet.end();
LBI != LBE; ++LBI)
dbgs() << "Loop contains blocks never placed into a chain!\n"
<< " Loop header: " << getBlockName(*L.block_begin()) << "\n"
<< " Chain header: " << getBlockName(*LoopChain.begin()) << "\n"
<< " Bad block: " << getBlockName(*LBI) << "\n";
}
assert(!BadLoop && "Detected problems with the placement of this loop.");
});
}
@ -575,21 +591,28 @@ void MachineBlockPlacement::buildCFGChains(MachineFunction &F) {
typedef SmallPtrSet<MachineBasicBlock *, 16> FunctionBlockSetType;
DEBUG({
// Crash at the end so we get all of the debugging output first.
bool BadFunc = false;
FunctionBlockSetType FunctionBlockSet;
for (MachineFunction::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
FunctionBlockSet.insert(FI);
for (BlockChain::iterator BCI = FunctionChain.begin(), BCE = FunctionChain.end();
BCI != BCE; ++BCI)
if (!FunctionBlockSet.erase(*BCI))
if (!FunctionBlockSet.erase(*BCI)) {
BadFunc = true;
dbgs() << "Function chain contains a block not in the function!\n"
<< " Bad block: " << getBlockName(*BCI) << "\n";
}
if (!FunctionBlockSet.empty())
if (!FunctionBlockSet.empty()) {
BadFunc = true;
for (SmallPtrSet<MachineBasicBlock *, 16>::iterator FBI = FunctionBlockSet.begin(),
FBE = FunctionBlockSet.end(); FBI != FBE; ++FBI)
dbgs() << "Function contains blocks never placed into a chain!\n"
<< " Bad block: " << getBlockName(*FBI) << "\n";
}
assert(!BadFunc && "Detected problems with the block placement.");
});
// Splice the blocks into place.