[Bug tree-optimization/41811] graphite miscompiles 454.calculix of the SPEC 2k6

[spop at gcc dot gnu dot org]

------- Comment #3 from spop at gcc dot gnu dot org  2009-10-23 19:46 -------
Also with -O3 the code of the loop body looks much nicer: several statements
disappear as they do not contain code anymore:  so we have this LST 

transformed_lst (
(root
  0 (loop
    0 (loop
      0 stmt_4
      1 (loop
        0 stmt_5)
      2 stmt_7
      3 stmt_18))))

and the code generated by CLooG for the interchange looks like this: 

for (scat_1=0;scat_1<=2;scat_1++) {
  for (scat_3=0;scat_3<=2;scat_3++) {
    S4(scat_1,scat_3) ;
    for (scat_5=0;scat_5<=2;scat_5++) {
      S5(scat_1,scat_5,scat_3) ;
    }
    S7(scat_1,scat_3) ;
    S18(scat_1,scat_3) ;
  }
  for (scat_3=3;scat_3<=19;scat_3++) {
    for (scat_5=0;scat_5<=2;scat_5++) {
      S5(scat_1,scat_5,scat_3) ;
    }
  }
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41811