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2016 Oct 19
4
RFC: Killing undef and spreading poison
On Wed, Oct 19, 2016 at 2:52 PM, Nuno Lopes via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Memcpy does a byte-by-byte copy. So if one of the bits is poison then only > the byte containing that bit becomes poison. > Therefore, memcpy(x, y, 1) is equivalent to load i8. But memcpy(x,y,4) is > not equivalent to "load i32" since load makes the whole value poison if