Jump if Equal :)

je instruction

(gdb) disass
Dump of assembler code for function fputs_unlocked:
   0xb7788c30 :	push   %ebp
   0xb7788c31 :	mov    %esp,%ebp
   0xb7788c33 :	sub    $0x1c,%esp
   0xb7788c36 :	mov    %ebx,-0xc(%ebp)
   0xb7788c39 :	call   0xb773daaf
   0xb7788c3e :	add    $0xe13b6,%ebx
   0xb7788c44 :	mov    %edi,-0x4(%ebp)
=> 0xb7788c47 :	mov    0x8(%ebp),%edi
   0xb7788c4a :	mov    %esi,-0x8(%ebp)
   0xb7788c4d :	mov    0xc(%ebp),%esi
   0xb7788c50 :	mov    %edi,(%esp)
   0xb7788c53 :	call   0xb779a530
   0xb7788c58 :	mov    %eax,%edx
   0xb7788c5a :	mov    -0x10c(%ebx),%eax
   0xb7788c60 :	test   %eax,%eax
   0xb7788c62 :	je     0xb7788cbb 
   0xb7788c64 :	mov    0x68(%esi),%eax
   0xb7788c67 :	test   %eax,%eax
   0xb7788c69 :	je     0xb7788c88 
   0xb7788c6b :	cmp    $0xffffffff,%eax
   0xb7788c6e :	je     0xb7788c8f 
   0xb7788c70 :	mov    $0xffffffff,%eax

je 0xb7788cbb

Process Involved

$ yes 1
.
.
1
1
1
1
1
1
1
.
.

Explanation

The Jump if Equal (je) instruction jumps if the zero flag is set.

source : http://stackoverflow.com/questions/147173/x86-assembly-testl-eax-against-eax