Adobe's C++ Performance Benchmarks and Blog

Adobe's C++ Performance Benchmarks is a set of simple C and C++ benchmarks in order to test compiler code generation. While it "C++" in the title, half the tests are in C. The author Chris Cox has also written a blog on C++ performance.

On my Mac (which is gcc 4.0.1), look at these fun things

    "int64_t equal constants"   7.36 sec   2175.19 M     0.46
 "int64_t notequal constants"  15.97 sec   1001.98 M     1.00

Yeah, "!=" is twice as slow as "==" for this type

Sorting is another fun one:

   "qsort array with function pointer"   4.52 sec    4.42 M     1.00
    "sort array with standard functor"   1.61 sec   12.41 M     0.36

Which translated says:

qsort( table, tablesize, sizeof(double), less_than_function1 );

is almost 3x slower than

sort( table, table + tablesize );

These are the simple ones, but the goal is to test performance of basic idioms and things you do all the time.