------- Comment #8 from spop at gcc dot gnu dot org 2009-08-25 21:03 ------- Disabling one of the useless gcc_asserts that verifies the consistency of the original representation before any transform, I am down to 0 seconds for the data dependence test, and the following compile times for graphite:
Graphite loop transforms: 2.60 (29%) usr 0.12 (60%) sys 2.69 (29%) wall 2365 kB ( 7%) ggc Graphite code generation: 0.14 ( 2%) usr 0.00 ( 0%) sys 0.21 ( 2%) wall 157 kB ( 0%) ggc TOTAL : 9.09 0.20 9.37 34582 kB This is in the graphite branch, and so -O3 contains -floop-strip-mine and -fgraphite-identity. I also have tested with -floop-interchange and there is no more overhead. I will test the patch in the graphite branch and then I will commit it to trunk. Sebastian -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40965