http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59999
--- Comment #20 from Paulo J. Matos <pa...@matos-sorge.com> --- OK, I was trying to make sense of all this and there are two things that stick out. One is when you say that due to C integer promotion rules make i = (short)((int)i + 1). However GCC is doing i = (short) ((unsigned short) i + 1). Am I missing something that allows this or makes the addition in int equivalent to the addition in unsigned short? Secondly we still have a dangling sign_extend later on that we could possibly optimize. I find it hard to understand if this can be done properly in expand or if a small pass like ree but before zero overhead loop generation is better. What do you think?
