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Just for fun I tried building building our grid analysis software with gcc 3.x instead of Sun's C compiler from the Forte Compiler Collection. The software makes extensive use of 64-bit integer math (and consequently executes much faster on a 900MHz UltraSPARC III+ than it does on a 2GHz Athlon running Linux) as all values in the grid files are either 64-bit integers (representing fixed point values) or 80-bit IEEE floats.
Unfortunately I don't have specific numbers offhand, and I'm sure gcc has matured quite a bit since I tried this (about a year and a half ago), but the binary bult with gcc performed at around 60% of the speed of the binary built with Forte 7.
Compared to the Sun compiler, gcc on sparcv9 is a joke for performance critical applications.