Le 19/05/2013 08:55, Václav Zeman a écrit :
> On 19 May 2013 05:17, dw <limegreenso...@yahoo.com> wrote:
>> There is a bug in __stosb (as well as the other __stos* functions), as
>> illustrated by this code (compile with -Os for 64bit):
>>
>> #include <stdio.h>
>> #include <windows.h>
>>
>> #ifndef _AMD64_
>> #error Must be compiled for 64 bit
>> #endif
>>
>> int main(int argc, char* argv[])
>> {
>> struct
>> {
>> int a;
>> int b;
>> } c;
>>
>> c.a = 1;
>> c.b = 2;
>>
>> __stosb((PBYTE)&c, 0, sizeof(c));
>> printf("%u %u\n", c.a, c.b); // Should print 0 0
>> }
>>
>> The attached patch resolves this issue.
> What bug is it? It is not obvious from just the diff.
"memory" clobber is missing (I agree that this is not obvious!)
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