[PATCH i386 4/8] [AVX512] [1/n] Add substed patterns.

[Richard Henderson]

On 10/28/2013 01:58 PM, Kirill Yukhin wrote:
> Hello Richard,
> On 28 Oct 08:20, Richard Henderson wrote:
>> Why is a masked *scalar* operation useful?
> 
> The reason the instructions exist is so that
> you can do fully fault correct predicated scalar algorithms.

Using VEC_MERGE isn't the proper representation for that.

If that's your real goal, then COND_EXEC is the only way to let
rtl know that faults are suppressed in the false condition.


r~