[Bug fortran/34067] gfortran.dg/char_cshift_2.f90 fails with -O3 -funroll-loops fails on Intel Darwin

[dominiq at lps dot ens dot fr]

------- Comment #2 from dominiq at lps dot ens dot fr  2007-11-12 10:22 -------
Looking at the test results, the failures seem to happen only on a Core2Duo
Darwin8 (may be only my build). They require both -O(2-3) and
-funroll(-all)-loops. I have also compared the results of -fdump-tree-optimized
with -O2 -funroll-loops and with

-O1 -funroll-loops -ftree-pre -ftree-vrp -fschedule-insns -fschedule-insns2
-fstrict-aliasing -fgcse --param max-aliased-vops=500 -fgcse-lm -falign-loops
-falign-jumps -falign-functions -fregmove -freorder-blocks -freorder-functions
-frerun-cse-after-loop -fsched-interblock -fsched-spec -fthread-jumps
-fcse-follow-jumps -fcse-skip-blocks -foptimize-sibling-calls -fpeephole2
-fexpensive-optimizations -fdelete-null-pointer-checks -fstrict-overflow
-fcrossjumping -fcaller-saves -falign-labels

(according the manual the later (no abort) should be equivalent to the former
(abort), but is not) and there is no difference. However the assembly codes are
quite differents.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34067