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Add a new helper method to SwitchInst. Useful when you've got a BB from

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somewhere (like the dominator graph) and would like to know which case it
came from.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30466 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2006-09-18 19:03:59 +00:00
parent 6d7ca92bbf
commit 011f184601
1 changed files with 13 additions and 0 deletions
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13
include/llvm/Instructions.h
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@ -1310,6 +1310,19 @@ public:
return 0;
}
/// findCaseDest - Finds the unique case value for a given successor. Returns
/// null if the successor is not found, not unique, or is the default case.
ConstantInt *findCaseDest(BasicBlock *BB) {
ConstantInt *CI = NULL;
for (unsigned i = 1, e = getNumCases(); i != e; ++i) {
if (getSuccessor(i) == BB) {
if (CI) return NULL; // Multiple cases lead to BB.
else CI = getCaseValue(i);
}
}
return CI;
}
/// addCase - Add an entry to the switch instruction...
///
void addCase(ConstantInt *OnVal, BasicBlock *Dest);