Using the new CLooG.org support in gcc trunk, I was able to benchmark the performance of gcc trunk built against ppl 0.11 and either legacy cloog support (built against ppl 0.10.2) or cloog-isl support. The benchmarks were done on x86_64-apple-darwin10 with...
Compile Command : gfortran -ffast-math -funroll-loops -msse3 -O3 -fgraphite-identity %n.f90 -o %n Compile Time (sec) Benchmark legacy cloog cloog-isl ac 1.52 1.53 aermod 61.41 62.00 air 4.87 4.30 capacita 2.58 2.58 channel 1.24 1.17 doduc 8.70 8.72 fatigue 3.10 3.10 gas_dyn 5.49 5.48 induct 6.80 6.72 linpk 1.72 1.28 mdbx 2.80 2.80 nf 3.37 3.38 protein 8.20 8.23 rnflow 9.65 9.62 test_fpu 7.03 7.04 tfft 0.77 0.78 Run Time (sec) Benchmark legacy cloog cloog-isl ac 8.89 8.89 aermod 17.04 17.16 air 5.43 6.08 capacita 32.35 32.35 channel 1.84 1.84 doduc 26.36 26.44 fatigue 7.98 7.98 gas_dyn 4.32 4.28 induct 20.35 20.36 linpk 15.49 15.50 mdbx 11.22 11.21 nf 30.30 30.27 protein 31.61 31.60 rnflow 23.38 23.38 test_fpu 8.09 8.10 tfft 1.87 1.87 The results look fairly equivalent except for the air benchmark which compiles about 12% faster with cloog-isl but executes about 12% faster with legacy cloog. Jack