unrecognizable insn help

[Tupshin Harper]

Are there any docs on how to interpret the call_insn that is spewed back 
as in below?

I'm not sure of a reasonable way to debug my md file.

-Tupshin

../../gcc/libgcc2.c: In function `__mulhi3':
../../gcc/libgcc2.c:365: unrecognizable insn:
(call_insn/u 26 24 27 (set (reg:SI 0 r0)
         (call (mem:SI (reg/f:SI 34) [0 S4 A32])
             (const_int 0 [0x0]))) -1 (insn_list 25 (nil))
     (expr_list:REG_EH_REGION (const_int -1 [0xffffffff])
         (nil))
     (expr_list (clobber (reg/f:SI 14 sp))
         (nil)))
../../gcc/libgcc2.c:365: Internal compiler error in extract_insn, at 
recog.c:2148