mi-watch.exp fail, pls help

[ligang@sunnorth.com.cn]

hello all,

When i run gdb testsuite, mi-watch.exp fail.

See the following diassembly:

34:  C = A + B;
     116:   1742        lw!     r7, [r2,8]
     118:   1641        lw!     r6, [r2,4]
     11a:   80c7 1810   add     r6, r7, r6
     11e:   2640        sw!     r6, [r2,0]
35:  return 0;
     120:   64c0        ldiu!   r6, 0
36:}
     122:   4086        mv!     r4, r6
     124:   5c8c        addi!   r2, 12
     126:   4002        mv!     r0, r2
     128:   0042        pop!    r2
     12a:   0083        br!     r3

After setting watchpoint to C, it will be hit at 0x11e, and PC will be 
0x120 at the time,
but GDB will execute a single step, after that, PC will be 0x122, so 
source line will be 36 but not 
expected 35.
Anyone can tell me how to resolve this problem?
Thanks.