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Floating-Point Equality Comparisons

The results of a floating-point equality comparison are architecture-dependent. Whether the comparison works depends on a number of things, including the compiler, the surrounding code, all compiler flags in use (particularly optimization flags), and the current floating-point mode for the thread. If your floating-point comparison is currently working on PowerPC, you may need to inspect it on an Intel-based Macintosh computer.

You can use the GCC flag -Wfloat-equal to receive a warning for floating-point equality comparisons. For details on this option, see Section 3.8 of the GNU C/C++/Objective-C 4.0.1 Compiler User Guide

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