Re: [Qemu-devel] [PATCH 5/6] Do constant folding for shift operations.

[Blue Swirl]

On Thu, May 26, 2011 at 4:56 PM, Richard Henderson <address@hidden> wrote:
> On 05/26/2011 05:36 AM, Kirill Batuzov wrote:
>>>   x = (int32_t)x >> (int32_t)y;
>>>
>> This expression has an implementation-defined behavior accroding to
>> C99 6.5.7 so we decided to emulate signed shifts by hand.
>
> Technically, yes.  In practice, no.  GCC, ICC, LLVM, MSVC all know
> what the user wants here and will implement it "properly".

Can't this be probed by configure? Then a wrapper could be introduced
for signed shifts.