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~