[PATCH] [clang/asan] Do not emit memcpy for trivial operator= when -fsanitize-address-field-padding >= 1

[Chandler Carruth]

Have you thought about force emitting the memcpy metadata that describes
the padding holes in the struct, and use that to predicate the
instrumentation?

While there is some risk that the optimizer loses this information,
frankly, we want to find all those places and fix them.

On Thu, Nov 6, 2014 at 8:01 PM, Kostya Serebryany <kcc at google.com> wrote:

> Hi majnemer, rsmith,
>
> If we've added poisoned paddings to a type do not emit memcpy for
> operator=.
>
> http://reviews.llvm.org/D6160
>
> Files:
>   lib/CodeGen/CGExprCXX.cpp
>   test/CodeGen/sanitize-address-field-padding.cpp
>
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