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Make dropTriviallyDeadConstantArrays not quadratic

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Only look at the operands of dead constant arrays instead of all
constant arrays again.
This commit is contained in:
Benjamin Kramer 2020-01-21 15:54:48 +01:00
parent d7032bc3c0
commit 81f385b0c6
1 changed files with 11 additions and 9 deletions
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16
llvm/lib/IR/LLVMContextImpl.cpp
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@ -11,6 +11,7 @@
//===----------------------------------------------------------------------===//
#include "LLVMContextImpl.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/OptBisect.h"
#include "llvm/IR/Type.h"
@ -142,18 +143,19 @@ LLVMContextImpl::~LLVMContextImpl() {
}
void LLVMContextImpl::dropTriviallyDeadConstantArrays() {
bool Changed;
do {
Changed = false;
SmallSetVector<ConstantArray *, 4> WorkList(ArrayConstants.begin(),
ArrayConstants.end());
for (auto I = ArrayConstants.begin(), E = ArrayConstants.end(); I != E;) {
auto *C = *I++;
while (!WorkList.empty()) {
ConstantArray *C = WorkList.pop_back_val();
if (C->use_empty()) {
Changed = true;
for (const Use &Op : C->operands()) {
if (auto *COp = dyn_cast<ConstantArray>(Op))
WorkList.insert(COp);
}
C->destroyConstant();
}
}
} while (Changed);
}
void Module::dropTriviallyDeadConstantArrays() {