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remove DebugIterations option. Despite the accusations,

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jump threading has been shown to only expose problems not
have bugs itself.  I'm sure it's completely bug free! ;-)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-12-08 22:44:07 +00:00
parent e4d1082b2c
commit 20fa76ef6f
1 changed files with 1 additions and 14 deletions
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15
lib/Transforms/Scalar/JumpThreading.cpp
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@ -36,11 +36,6 @@ Threshold("jump-threading-threshold",
cl::desc("Max block size to duplicate for jump threading"), cl::desc("Max block size to duplicate for jump threading"),
cl::init(6), cl::Hidden); cl::init(6), cl::Hidden);
static cl::opt<int>
DebugIterations("jump-threading-debug",
cl::desc("Stop jump threading after N iterations"),
cl::init(-1), cl::Hidden);
namespace { namespace {
/// This pass performs 'jump threading', which looks at blocks that have /// This pass performs 'jump threading', which looks at blocks that have
/// multiple predecessors and multiple successors. If one or more of the /// multiple predecessors and multiple successors. If one or more of the
@ -110,15 +105,11 @@ bool JumpThreading::runOnFunction(Function &F) {
// If the block is trivially dead, zap it. This eliminates the successor // If the block is trivially dead, zap it. This eliminates the successor
// edges which simplifies the CFG. // edges which simplifies the CFG.
if (pred_begin(BB) == pred_end(BB) && if (pred_begin(BB) == pred_end(BB) &&
BB != &BB->getParent()->getEntryBlock() && BB != &BB->getParent()->getEntryBlock()) {
DebugIterations != 0) {
DOUT << " JT: Deleting dead block '" << BB->getNameStart() DOUT << " JT: Deleting dead block '" << BB->getNameStart()
<< "' with terminator: " << *BB->getTerminator(); << "' with terminator: " << *BB->getTerminator();
DeleteDeadBlock(BB); DeleteDeadBlock(BB);
Changed = true; Changed = true;
if (DebugIterations != -1)
DebugIterations = DebugIterations-1;
} }
} }
AnotherIteration = Changed; AnotherIteration = Changed;
@ -193,10 +184,6 @@ static unsigned getJumpThreadDuplicationCost(const BasicBlock *BB) {
/// ProcessBlock - If there are any predecessors whose control can be threaded /// ProcessBlock - If there are any predecessors whose control can be threaded
/// through to a successor, transform them now. /// through to a successor, transform them now.
bool JumpThreading::ProcessBlock(BasicBlock *BB) { bool JumpThreading::ProcessBlock(BasicBlock *BB) {
if (DebugIterations == 0) return false;
if (DebugIterations != -1)
DebugIterations = DebugIterations-1;
// If this block has a single predecessor, and if that pred has a single // If this block has a single predecessor, and if that pred has a single
// successor, merge the blocks. This encourages recursive jump threading // successor, merge the blocks. This encourages recursive jump threading
// because now the condition in this block can be threaded through // because now the condition in this block can be threaded through