error could not split insn

[htio2]

Hi, 

I was trying to split the sub instructuction into 2 16bit process and came
across this error:
error: could not split insn

using gdb i was able to trace the error to the below in try_split (rtx pat,
rtx trial, int last) function:
  /* We're not good at redistributing frame information.  */
  if (RTX_FRAME_RELATED_P (trial))
    return trial;

my question is is there any reason that frame insn cannot be split ? and how
do I fix it ?

Thanks.



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