These 4 tests fail on power9 FAIL: gcc.dg/graphite/uns-interchange-9.c scan-tree-dump graphite "tiled" FAIL: gcc.dg/graphite/interchange-3.c scan-tree-dump graphite "tiled" FAIL: gcc.dg/graphite/interchange-7.c scan-tree-dump graphite "tiled" FAIL: gcc.dg/graphite/interchange-9.c scan-tree-dump graphite "tiled" They appear to be erratic in failing; while trying to track down an originating revision I was seeing some older revisions work and then later fail. When they fail they all fail the same way: spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/xgcc -B/home/seurer/gcc/build/gcc-trunk/gcc/ /home/seurer/gcc/gcc-trunk/gcc/testsuite/gcc.dg/graphite/interchange-3.c -fno-diagnostics-show-caret -fdiagnostics-color=never -O2 -ffast-math -floop-nest-optimize -fdump-tree-graphite-all -lm -o ./interchange-3.exe PASS: gcc.dg/graphite/interchange-3.c (test for excess errors) . . . PASS: gcc.dg/graphite/interchange-3.c execution test FAIL: gcc.dg/graphite/interchange-3.c scan-tree-dump graphite "tiled"
which ISL version are you using? Anything older than 0.18 is known to cause some of those fails.
That could be it. I started the tester over with a complete refresh of the source and haven't seen the failures since.