Hi! On Thu, Apr 07, 2022 at 09:19:51AM -0500, will schmidt wrote: > On Mon, 2022-02-28 at 13:37 +0800, Kewen.Lin via Gcc-patches wrote: > > As PR103196 shows, p9-vec-length-full-7.c needs to be adjusted as the > > complete unrolling can happen on some of its loops. This patch is to > > use pragma "GCC unroll 0" to disable all possible loop unrollings. > > Hope it can help the case not that fragile. > > ok > > Is the lack of effectiveness of "-fno-unroll-loops" otherwise > understood, or is there further issue behind that option?
There is -fpeel-loops as well, and cunroll is independent of all of these as well? > I would > expect the effect of the option, versus the pragma, two to roughly > equivalent. Obviously it is not. :-) Yes, me too. And I do not see what makes the difference, if it isn't the peel thing :-( Ke Wen, can you try with -fno-peel-loops please? Segher
