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Not all users of a BB are Instructions any more.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48047 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2008-03-08 07:48:41 +00:00
parent 6456d8639b
commit 6c36a0f9ee
2 changed files with 9 additions and 6 deletions
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8
include/llvm/BasicBlock.h
View File

@ -95,11 +95,6 @@ public:
const Function *getParent() const { return Parent; }
Function *getParent() { return Parent; }
/// use_back - Specialize the methods defined in Value, as we know that an
/// BasicBlock can only be used by Instructions (specifically PHI and terms).
Instruction *use_back() { return cast<Instruction>(*use_begin());}
const Instruction *use_back() const { return cast<Instruction>(*use_begin());}
/// getTerminator() - If this is a well formed basic block, then this returns
/// a pointer to the terminator instruction. If it is not, then you get a
/// null pointer back.
@ -187,6 +182,9 @@ public:
/// update the PHI nodes that reside in the block. Note that this should be
/// called while the predecessor still refers to this block.
///
/// DontDeleteUselessPHIs will keep PHIs that have one value or the same
/// value for all entries.
///
void removePredecessor(BasicBlock *Pred, bool DontDeleteUselessPHIs = false);
/// splitBasicBlock - This splits a basic block into two at the specified

7
lib/Transforms/Scalar/SCCP.cpp
View File

@ -45,7 +45,7 @@ using namespace llvm;
STATISTIC(NumInstRemoved, "Number of instructions removed");
STATISTIC(NumDeadBlocks , "Number of basic blocks unreachable");
STATISTIC(IPNumInstRemoved, "Number ofinstructions removed by IPSCCP");
STATISTIC(IPNumInstRemoved, "Number of instructions removed by IPSCCP");
STATISTIC(IPNumDeadBlocks , "Number of basic blocks unreachable by IPSCCP");
STATISTIC(IPNumArgsElimed ,"Number of arguments constant propagated by IPSCCP");
STATISTIC(IPNumGlobalConst, "Number of globals found to be constant by IPSCCP");
@ -1637,6 +1637,11 @@ bool IPSCCP::runOnModule(Module &M) {
// If there are any PHI nodes in this successor, drop entries for BB now.
BasicBlock *DeadBB = BlocksToErase[i];
while (!DeadBB->use_empty()) {
if (BasicBlock *PredBB = dyn_cast<BasicBlock>(DeadBB->use_back())) {
PredBB->setUnwindDest(NULL);
continue;
}
Instruction *I = cast<Instruction>(DeadBB->use_back());
bool Folded = ConstantFoldTerminator(I->getParent());
if (!Folded) {