[llvm-bugs] [Bug 26997] memset() is optimised out even if followed by asm("":::"memory")

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26997

Коренберг Марк <socketpair at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

--- Comment #4 from Коренберг Марк <socketpair at gmail.com> ---
OKAY.

But following program does not work as expected :)

How to fix ? Is this a bug ?

===========================
#include <string.h>

static void* memset_s(void* buf, int ch, size_t size) {
    void *ret = memset(buf, 0, sizeof(buf));
    asm volatile("": : "g" (buf) :"memory");
    return ret;
}

int main() {
    char buf[256];
    memset_s(buf, 0, sizeof(buf));
    return buf[0];
}

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