I                 163 enc/unicode.c  #define I(n) OnigSpecialIndexEncode(n)
I                 177 enc/unicode.c  #undef I
I                 321 ext/digest/md5/md5.c #define I(x, y, z) ((y) ^ ((x) | ~(z)))
I                  70 ext/digest/rmd160/rmd160.c #define I(x, y, z)	(((x) & (z)) | ((y) & ~(z)))
I                6020 gc.c           #define I(s) ID_##s = rb_intern(#s);
I                6028 gc.c           #undef I