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On 12/16/11 4:14 PM, Chris Lattner wrote: > On Dec 16, 2011, at 12:39 PM, Kostya Serebryany wrote: >> >> > Do we consider the above transformation legal? >> > > Yes, the transformation is perfectly legal for the normal compiler. So how do you guarantee that the behavior is predictable regardless of hardware platform if you don't define what the behavior

On Dec 16, 2011, at 12:39 PM, Kostya Serebryany wrote: > > Do we consider the above transformation legal? Yes, the transformation is perfectly legal for the normal compiler. > > I would argue that it should not be legal. We don't actually know what > > comes after the 22 byte object. Is it another memory object? A > > memory-mapped I/O device? Unmapped memory?

...ries of "load + mask + or + store" operations. These are loading and touching "undefined" bits in a completely defined way. -Chris -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20111216/7dae1cfb/attachment.html>