Gcc 4.4 generates an extra load in a loop:

[hjl@gnu-6 gcc]$ cat /tmp/b.c 
#include <tmmintrin.h>

extern __m128i src[10];
extern __m128i resdst[10];

void
foo (void)
{
  int i;

  for (i = 0; i < 10; i++)
    resdst[i] = _mm_abs_epi16 (src[i]);
}
[hjl@gnu-6 gcc]$ gcc -O2 -S /tmp/b.c -o old.s -mssse3 -fno-asynchronous-unwind-tables
[hjl@gnu-6 gcc]$ gcc --version
gcc (GCC) 4.3.0 20080428 (Red Hat 4.3.0-8)
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[hjl@gnu-6 gcc]$ cat old.s
	.file	"b.c"
	.text
	.p2align 4,,15
.globl foo
	.type	foo, @function
foo:
	xorl	%eax, %eax
	.p2align 4,,10
	.p2align 3
.L2:
	pabsw	src(%rax), %xmm0
	movdqa	%xmm0, resdst(%rax)
	addq	$16, %rax
	cmpq	$160, %rax
	jne	.L2
	rep
	ret
	.size	foo, .-foo
	.ident	"GCC: (GNU) 4.3.0 20080428 (Red Hat 4.3.0-8)"
	.section	.note.GNU-stack,"",@progbits
[hjl@gnu-6 gcc]$  ./xgcc -B./ -O2 -mssse3 -S /tmp/b.c -fno-asynchronous-unwind-tables
[hjl@gnu-6 gcc]$ cat b.s
	.file	"b.c"
	.text
	.p2align 4,,15
.globl foo
	.type	foo, @function
foo:
	xorl	%eax, %eax
	.p2align 4,,10
	.p2align 3
.L2:
	movdqu	src(%rax), %xmm0
	pabsw	%xmm0, %xmm0
	movdqu	%xmm0, resdst(%rax)
	addq	$16, %rax
	cmpq	$160, %rax
	jne	.L2
	rep
	ret
	.size	foo, .-foo
	.ident	"GCC: (GNU) 4.4.0 20081006 (experimental) [trunk revision 140917]"

There are 2 problems:

1. Alignment info is lost and unaligned load is generated.
2. The load isn't needed at all.