[Bug tree-optimization/33246] Missed opportunities for vectorization due to data ref analysis
--- Comment #1 from spop at gcc dot gnu dot org 2007-08-30 03:07 --- Created an attachment (id=14136) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14136&action=view) testcase I just realized that all these inlined testcases were scrambled by bugzilla. I'm submitting the testcases as attachments. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33246
[Bug tree-optimization/33246] Missed opportunities for vectorization due to data ref analysis
--- Comment #2 from steven at gcc dot gnu dot org 2007-08-30 08:07 --- Having this case vectorized might help us look better compared to other compilers. gfortran produces a 65% slower "fatigue" binary than the faster compiler (Sun f95, see http://www.eleves.ens.fr/home/coudert/benchmark.pdf) -- steven at gcc dot gnu dot org changed: What|Removed |Added Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|-00-00 00:00:00 |2007-08-30 08:07:00 date|| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33246
[Bug tree-optimization/33246] Missed opportunities for vectorization due to data ref analysis
--- Comment #3 from dorit at gcc dot gnu dot org 2007-08-31 13:57 --- ... > This is due to data ref analysis problems: > ./fatigue.f90:14: note: not vectorized: data ref analysis failed > (*stress_tensor.0_16)[D.1508_168] = D.1513_173 > ./fatigue.f90:14: note: bad data references. > and > ./fatigue.f90:14: note: not vectorized: data ref analysis failed D.1489_133 = > (*strain_tensor.0_41)[D.1488_132] > ./fatigue.f90:14: note: bad data references. The data-ref analyzer reports: failed: evolution of offset is not affine. As a result, the DR fields that represent the access relative to the inner-most loop are almost all empty: base_address: offset from base address: constant offset from base address: step: aligned to: base_object: (*(real8[0:D.1433] *) D.1437_15)[0] symbol tag: SMT.79 However note that the DR fields relative to the outer-loop are computable: outer base_address: &A.23 outer offset from base address: 0 outer constant offset from base address: 0 outer step: 24 outer aligned to: 128 If the data-ref analyzer can return the expression for the evolution in the inner-loop, instead of failing, we would at least have a chance to do outer-loop vectorization. This is a duplicate of PR33113. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33246
[Bug tree-optimization/33246] Missed opportunities for vectorization due to data ref analysis
--- Comment #4 from spop at gcc dot gnu dot org 2007-08-31 14:19 --- Duplicate. *** This bug has been marked as a duplicate of 33113 *** -- spop at gcc dot gnu dot org changed: What|Removed |Added Status|NEW |RESOLVED Resolution||DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33246
