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37be0d7c43
This was introduced in a faulty refactoring (r225640, mea culpa): the tests weren't testing the return values, so, for both __strcpy_chk and __stpcpy_chk, we would return the end of the buffer (matching stpcpy) instead of the beginning (for strcpy). The root cause was the prefix "__" being ignored when comparing, which made us always pick LibFunc::stpcpy_chk. Pass the LibFunc::Func directly to avoid this kind of error. Also, make the testcases as explicit as possible to prevent this. The now-useful testcases expose another, entangled, stpcpy problem, with the further simplification. This was introduced in a refactoring (r225640) to match the original behavior. However, this leads to problems when successive simplifications generate several similar instructions, none of which are removed by the custom replaceAllUsesWith. For instance, InstCombine (the main user) doesn't erase the instruction in its custom RAUW. When trying to simplify say __stpcpy_chk: - first, an stpcpy is created (fortified simplifier), - second, a memcpy is created (normal simplifier), but the stpcpy call isn't removed. - third, InstCombine later revisits the instructions, and simplifies the first stpcpy to a memcpy. We now have two memcpys. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227250 91177308-0d34-0410-b5e6-96231b3b80d8
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