x87test.c output (x87inline.h Rev 1.01) Opteron 248 (2.2 GHz) on SuSE Linux (64-bit) gcc 3.3 -m64 -O3 -ffast-math sincos: Default: sum = 2.00000696427016e+07 CPU time = 1.82 seconds. In-line: sum = 2.00000696427016e+07 CPU time = 1.54 seconds. atan2: Default: sum = 4.17421689313004e+07 CPU time = 1.53 seconds. In-line: sum = 4.17421689313004e+07 CPU time = 1.63 seconds. exp: Default: sum = 5.00013168762220e+07 CPU time = 1.7 seconds. In-line: sum = 5.00013168762220e+07 CPU time = 3.32 seconds. pow: Default: sum = 4.56558765935046e+08 CPU time = 4.72 seconds. In-line: sum = 4.56558765935046e+08 CPU time = 2.01 seconds.