On Sun, 2007-09-30 at 08:27 -0700, scarvenger wrote: > The following code seems to be considered ilegal in GCC, why? > > movb 2(%1, %%ecx), (%0, %%ecx);
It looks like you're compiling for a 80x86 machine. The 80x86 architecture doesn't have any instruction that moves values between two memory locations, which is basically what you're trying to do here. > Why when i try to compile my program with the following code and the option > -O3 the compiler says to me that the symbol bgrLoop was already defined? > > __asm__ __volatile__ ( > "xorl %%ecx, %%ecx;" > "bgrLoop:;" > "movb (%1, %%ecx), %%al;" > "movb 2(%1, %%ecx), %%ah;" > "movb %%al, 2(%0, %%ecx);" > "movb %%ah, (%0, %%ecx);" > "addl $3, %%ecx;" > "decl %2;" > "jnz bgrLoop;" : "=r" (buffer) : "r" (buffer), "r" (size) : "ah", > "al", "ecx"); Please post a compilable piece of code (even if the code produce compilation errors) in order for others to help you. Assuming buffer is of type char* and size is of type size_t, the above code compile with no compilation errors, even when I use -O3. -- John V. Shahid <[EMAIL PROTECTED]> _______________________________________________ help-gplusplus mailing list help-gplusplus@gnu.org http://lists.gnu.org/mailman/listinfo/help-gplusplus
