------- Comment #6 from kenneth dot hoste at elis dot ugent dot be 2009-06-09 14:51 ------- Some more related details which might help shed light on the cause behind this.
The 178.galgel benchmark (again, Fortran), is also being miscompiled, but now using -ffixed-form -fno-ira-share-spill-slots -fno-tree-loop-im in combination with -O3 or -Os. Note that -O1 and -O2 are working fine with these options specified. (-ffixed-form is always needed to compile galgel, so this one is probably of minor importance here) On top of this, additionally specifying -fno-tree-dominator-opts resolves the issue at -O3 (corrext code is being emitted), but this is not the case at -Os, where the miscompile still occurs. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40386
