use this option to prove your hypothesis: -fshort-double this would make sizeof(double) = sizeof(float) by this, stack problems should go away. but this is not a suffested compiler options because of portability issues. Stephen Ray wrote: > > Just a thought, but not a particularly educated one. Compiling with > -Wall gives me: > > test.c:4: warning: return type defaults to `int' > test.c: In function `main': > test.c:15: warning: int format, double arg (arg 3) > test.c:16: warning: int format, double arg (arg 2) > test.c:18: warning: int format, double arg (arg 2) > test.c:18: warning: int format, double arg (arg 3) > test.c:20: warning: control reaches end of non-void function > > Looks like maybe the floats are automatically promoted to doubles before > they are passed to printf. I don't know if that's standard behaviour, > but it seems reasonable. So then in the first case, two 64-bit values > are put on the stack, and two 64-bit values are taken off the stack. > > In the second case, two 64-bit values are put on the stack, one 64-bit > value is taken off the stack and presented correctly, and one 64-bit > value has only the first 32 bits read, and misinterpreted as a signed int. > > In the third case, two 64-bit values are put on the stack, and the first > 32 bits are interpreted as the first signed int, and the second next 64 > are interpreted as a double. So case 3 is different from case 2 in that > the double value in case 3 is made up of two halves of two different > doubles, while in case 2 the double is made from an actual double. > > Or something like that. > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
