- if (SI->getCondition() == Val) {
- // We don't know anything in the default case.
- if (SI->getDefaultDest() == BBTo) {
- Result.markOverdefined();
- return true;
- }
-
- unsigned BitWidth = Val->getType()->getIntegerBitWidth();
- ConstantRange EdgesVals(BitWidth, false/*isFullSet*/);
- for (SwitchInst::CaseIt i = SI->case_begin(), e = SI->case_end();
- i != e; ++i) {
- if (i.getCaseSuccessor() != BBTo) continue;
- ConstantRange EdgeVal(i.getCaseValue()->getValue());
+ if (SI->getCondition() != Val)
+ return false;
+
+ bool DefaultCase = SI->getDefaultDest() == BBTo;
+ unsigned BitWidth = Val->getType()->getIntegerBitWidth();
+ ConstantRange EdgesVals(BitWidth, DefaultCase/*isFullSet*/);
+
+ for (SwitchInst::CaseIt i = SI->case_begin(), e = SI->case_end();
+ i != e; ++i) {
+ ConstantRange EdgeVal(i.getCaseValue()->getValue());
+ if (DefaultCase) {
+ // It is possible that the default destination is the destination of
+ // some cases. There is no need to perform difference for those cases.
+ if (i.getCaseSuccessor() != BBTo)
+ EdgesVals = EdgesVals.difference(EdgeVal);
+ } else if (i.getCaseSuccessor() == BBTo)