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I tested a little scientific application (in C source)which involves long double
computations. It writes the results in raw data file (which is consisted of
3000000 long double values).
I found that there are differences between the data files produced from the
application compiled with and without -O2 gcc option:
fc data.bin data_o2.bin /b
0000000A: 22 00
0000002E: 22 00
00000052: 22 00
0225509E: 22 00
022550C2: 22 00
022550E6: 22 00
There was only 1000000 (exactly) identical differences.
I conducted the test with gcc v3.2.3 (mingw special 20030504-1) and gcc version
3.3.1 (mingw special 20030804-1) on P4 platform.
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