------- Comment #4 from wilson at gcc dot gnu dot org 2006-02-28 03:25 ------- The number 5e-324 exceeds the range of the (C language) double type. So the result you get will depend on how overflow is handled. If I use a number within the range of double, it works fine. I don't know what Java is supposed to do in the presence of overflow here.
Compile this with -E #include <float.h> DBL_MIN_10_EXP and we get a result of -307. So 5e-324 is an out-of-range number. The number is within range of an IA-64/x86 80-bit FP long double number. LDBL_MIN_10_EXP is -4931. So if long doubles are being used, intentionally or accidentally, this could work. On an x86_64 system, I get an answer of 0.0 for both the compiled and interpreted tests. If I use -m32 when compiling, I get the answer "5E-324". I don't have a 32-bit compiled interpreter, so I can't check that. Without access to a copy of the Java standard, it isn't clear to me what the correct answer is here. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26483
