HelenOS sources

isunordered       109 uspace/lib/c/include/math.h #define isunordered(x, y)    __builtin_isunordered(x, y)
isunordered       131 uspace/lib/c/include/math.h #define isunordered(x, y)    (!__fcompare(sizeof(x), sizeof(y), (x), (y)))
isunordered       109 uspace/lib/posix/include/libc/math.h #define isunordered(x, y)    __builtin_isunordered(x, y)
isunordered       131 uspace/lib/posix/include/libc/math.h #define isunordered(x, y)    (!__fcompare(sizeof(x), sizeof(y), (x), (y)))