Re: delete LIBCALL note after split

[Ian Lance Taylor <iant at google dot com>]

Sa Liu <SALIU@de.ibm.com> writes:

> I have added a piece of code in try_split to handle the links. Not sure 
> whether this is O.K. for the other platforms.

Thanks.  The general idea looks right, but the implementation is
incorrect.

> +       case REG_LIBCALL:
> +       /* Relink the insns with REG_LIBCALL note and with REG_RETVAL note 
> 
> +          after split.  */
> +           note_libcall 
> +                = find_reg_note (trial, REG_LIBCALL, NULL); 

You don't need to look up the note again in TRIAL, you already have it
in the NOTE variable.

> +           REG_NOTES (insn_last) = note_libcall;

Notes are a linked list, so this will 1) move the whole linked list to
INSN_LAST; 2) clobber the existing notes on INSN_LAST.  You need to do
something like 
  REG_NOTES (insn_last) = gen_rtx_EXPR_LIST (REG_LIBCALL,
                                             XEXP (note_libcall, 0),
                                             REG_NOTES (insn_last));

Ian