> > The problem is with the optimization flags: passing -Os causes the compiler > > to be stupid and not inline any memset/memcpy functions. > > you get what you ask for.. if you don't want that then don't ask for > it ;)
Well, the compiler is really being dumb about -Os and in fact it's giving bigger code, so I'm not really getting what I ask for. With my gcc at least (x86_64, gcc (GCC) 4.1.3 20070812 (prerelease) (Ubuntu 4.1.2-15ubuntu2)) and Andi's example: #include <string.h> f(char x[6]) { memset(x, 1, 6); } compiling with -O2 gives 0000000000000000 <f>: 0: c7 07 01 01 01 01 movl $0x1010101,(%rdi) 6: 66 c7 47 04 01 01 movw $0x101,0x4(%rdi) c: c3 retq and compiling with -Os gives 0000000000000000 <f>: 0: 48 83 ec 08 sub $0x8,%rsp 4: ba 06 00 00 00 mov $0x6,%edx 9: be 01 00 00 00 mov $0x1,%esi e: e8 00 00 00 00 callq 13 <f+0x13> 13: 5a pop %rdx 14: c3 retq so the code gets bigger and worse in every way. - R. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/