------- Comment #6 from pinskia at gcc dot gnu dot org 2008-09-16 15:55 ------- (In reply to comment #5) > (In reply to comment #2) > Hi Andrew, > > Does this do it for you or is this all to rarified for this > Bear-of-little-brain to follow? > > D.1359 = *start - *offset; > D.1360 = *end + *offset; > D.1361 = *step; > D.1364 = D.1361 > 0 ? D.1360 < D.1359 : D.1360 > D.1359; /* Fix the > result*/ > if (D.1364) goto L.2; /* Then branch > */
The issue is that D.1364 is used to the store of the result of a comparison. Since GCC does not currently optimize that case, the front-end could rewrite the if statement to begin with; this is what Jabuk's patch does (Thanks Jabuk!). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37536
