x87test.c output (x87inline.h Rev 1.01)
P4 Xeon 3.06 GHz running Win XP
gcc 3.2.3 (MinGW 3.1.0) -O3 -ffast-math

sincos:
Default:
    sum = 2.00000696427020e+007
    CPU time = 3.359 seconds.
In-line:
    sum = 2.00000696427020e+007
    CPU time = 1.86 seconds.

atan2:
Default:
    sum = 4.17421689313004e+007
    CPU time = 2.922 seconds.
In-line:
    sum = 4.17421689313004e+007
    CPU time = 1.266 seconds.

exp:
Default:
    sum = 5.00013168762230e+007
    CPU time = 8.548 seconds.
In-line:
    sum = 5.00013168762230e+007
    CPU time = 6.657 seconds.

pow:
Default:
    sum = 4.56558765935041e+008
    CPU time = 3.469 seconds.
In-line:
    sum = 4.56558765935041e+008
    CPU time = 2.906 seconds.