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...ot;, but the underlying issue is the use of "long double" computations. First the results: The timings I get (on 2xG5 2.7GHz) are: gcc3: 0.8s gcc4: 4.5s (dynamic libgcc) gcc4: 4.2s (static libgcc) Basically any calls that use long double will be affected: qadd: 4.5s (gcc3 opt), 6.7s (Agcc4 opt), 7.4s (gcc3), 7.9s (gcc4 opt +dyngcc), 10.5s (Agcc4), 10.6s (gcc4 dyngcc) (this test basically runs 500x 1M long double additions on an array - it's even more extreme if you run it on short arrays : 250kx1k will give 2s on gcc3 and 7.7s on gcc4) Now, the actual reason is that gcc3 s...