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Re: Why doesn't GCC generate conditional move for COND_EXPR?
On Mon, Oct 24, 2011 at 7:00 AM, Richard Guenther
> On Mon, Oct 24, 2011 at 2:55 PM, Bingfeng Mei <firstname.lastname@example.org> wrote:
>> I noticed that COND_EXPR is not expanded to conditional move
>> as MIN_EXPR/MAX_EXPR are (assuming movmodecc is available).
>> I wonder why not?
>> I have some loop that fails tree vectorization, but still contains
>> COND_EXPR from tree ifcvt pass. In the end, the generated code
>> is worse than if I don't turned -ftree-vectorize on. ÂThis
>> is on our private port.
> Because nobody touched COND_EXPR expansion since ages.
I have a patch which I will be submitting next week or so that does
this expansion correctly. In fact I have a few patches which improves
the generation of COND_EXPR in simple cases (in PHI-OPT).