tracing my own simple C program

Breakpoint 1, __wcslen_sse2 () at ../sysdeps/i386/i686/multiarch/wcslen-sse2.S:27
27		mov	STR(%esp), %edx

0x8048550:	 U"Spectate"

eax            0x8048550	134514000


29		cmp	$0, (%edx)
30		jz	L(exit_tail0)
31		cmp	$0, 4(%edx)
32		jz	L(exit_tail1)
33		cmp	$0, 8(%edx)
34		jz	L(exit_tail2)
35		cmp	$0, 12(%edx)
36		jz	L(exit_tail3)
37		cmp	$0, 16(%edx)
38		jz	L(exit_tail4)
39		cmp	$0, 20(%edx)
40		jz	L(exit_tail5)
41		cmp	$0, 24(%edx)
42		jz	L(exit_tail6)
43		cmp	$0, 28(%edx)
44		jz	L(exit_tail7)
46		pxor	%xmm0, %xmm0
48		lea	32(%edx), %eax
49		lea	16(%edx), %ecx
50		and	$-16, %eax
52		pcmpeqd	(%eax), %xmm0
53		pmovmskb %xmm0, %edx
54		pxor	%xmm1, %xmm1
55		test	%edx, %edx

edx            0xf	15

56		lea	16(%eax), %eax
57		jnz	L(exit)
125		sub	%ecx, %eax
126		shr	$2, %eax
127		test	%dl, %dl

eax            0x8	8
edx            0xf	15

128		jz	L(exit_high)
130		mov	%dl, %cl
131		and	$15, %cl
132		jz	L(exit_1)
133		ret

eax            0x8	8
edx            0xf	15