This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
Jason Merrill wrote:
On 10/10/2013 04:46 AM, Tobias Burnus wrote:I considered to add the annotation also to C++11's range-based loops, but as those are unlikely to vectorize, I didn't do so.I would think that a range-based loop over an array should vectorize nicely: int ar[8]; for (int i: ar) { ... }
They do - but during my experiments they either also did without "#pragma GCC ivdep" â typically with static arrays like yours â or they didn't with vector<>.
However, I came now up with an example where "#pragma GCC ivdep" should have an effect:
int ar[100]; void foo(int *a) { for (auto &i : ar) { i *= *a; } } Therefore, I will send a follow up patch. Tobias
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |