[llvm-bugs] [Bug 34213] - -fsanitize=undefined doesn't pay attention to __builtin_assume_aligned()

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Aug 16 15:23:15 PDT 2017


Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk

--- Comment #2 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Right, __builtin_assume_aligned means "assume that this pointer has a certain
alignment in addition to everything else you know", or put another way, "assume
the bottom N bits of this pointer are zeroes". It does not remove or override
any alignment information that comes from elsewhere.

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