On Monday 06 June 2005 07:09 pm, Tres Melton wrote:
> The "nop" is just an easy way to place markers in the code so you
> can find the interesting parts quickly. In reality it costs one clock
> cycle for each "nop".
i use asm label tricks:
$ cat test.c
int main(int argc, char *argv[])
{
int a;
asm("startit:");
a = 10;
asm("stopit:");
return 0;
}
$ gcc -c test.c && objdump -d test.o
test.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <main>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 89 7d fc mov %edi,0xfffffffffffffffc(%rbp)
7: 48 89 75 f0 mov %rsi,0xfffffffffffffff0(%rbp)
000000000000000b <startit>:
b: c7 45 ec 0a 00 00 00 movl $0xa,0xffffffffffffffec(%rbp)
0000000000000012 <stopit>:
12: b8 00 00 00 00 mov $0x0,%eax
17: c9 leaveq
18: c3 retq
-mike
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