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Author SHA1 Message Date
Davide Italiano 6c2c3e07bf [SCCP] Teach the pass how to handle `div` with overdefined operands. 
This can prove that:

extern int f;
int g() {
    int x = 0;
    for (int i = 0; i < 365; ++i) {
        x /= f;
    }
    return x;
}

always returns zero. Thanks to Sanjoy for confirming this
transformation actually made sense (bugs are mine).

llvm-svn: 292531
 2017-01-19 23:07:51 +00:00