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Change a place to use an arbitrary value instead of null, when possible

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llvm-svn: 22605
This commit is contained in:
Chris Lattner 2005-08-02 23:29:23 +00:00
parent 239aee9cd3
commit b5906d5783
1 changed files with 3 additions and 3 deletions
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6
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -849,13 +849,13 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
while (!BB->empty()) {
Instruction &I = BB->back();
// If this instruction is used, replace uses with an arbitrary
// constant value. Because control flow can't get here, we don't care
// value. Because control flow can't get here, we don't care
// what we replace the value with. Note that since this block is
// unreachable, and all values contained within it must dominate their
// uses, that all uses will eventually be removed.
if (!I.use_empty())
// Make all users of this instruction reference the constant instead
I.replaceAllUsesWith(Constant::getNullValue(I.getType()));
// Make all users of this instruction use undef instead
I.replaceAllUsesWith(UndefValue::get(I.getType()));
// Remove the instruction from the basic block
BB->getInstList().pop_back();