Source:

void foo(float *a, float *b) {
    __asm__ volatile (
        "vld1.32 {d8[],d9[]}, [%1,:32] \n\t"
        "vst1.32 {q4},        [%0,:128] \n\t"
        :: "r"(a), "r"(b)
        : "q4"
    );
}

arm-none-linux-gnueabi-gcc-4.4.3 -O3 -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp neonasm.c -S

foo:
	@ args = 0, pretend = 0, frame = 0
	@ frame_needed = 0, uses_anonymous_args = 0
	@ link register save eliminated.
	fstmfdd	sp!, {d8}
#APP
@ 2 "neonasm.c" 1
	vld1.32 {d8[],d9[]}, [r1,:32] 
	vst1.32 {q4},        [r0,:128] 
	
@ 0 "" 2
	fldmfdd	sp!, {d8}
	bx	lr


Both d8 and d9 should be saved, not just d8.