r251511 - in /trunk/gcc: ChangeLog final.c is-a...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Wed Aug 30 11:18:37 2017
New Revision: 251511

URL: https://gcc.gnu.org/viewcvs?rev=251511&root=gcc&view=rev
Log:
[59/77] Add a rtx_jump_table_data::get_data_mode helper

This patch adds a helper function to get the mode of the addresses
or offsets in a jump table.  It also changes the final.c code to use
rtx_jump_table_data over rtx or rtx_insn in cases where it needed
to use the new helper.  This in turn meant adding a safe_dyn_cast
equivalent of safe_as_a, to cope with null NEXT_INSNs.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* is-a.h (safe_dyn_cast): New function.
	* rtl.h (rtx_jump_table_data::get_data_mode): New function.
	(jump_table_for_label): Likewise.
	* final.c (final_addr_vec_align): Take an rtx_jump_table_data *
	instead of an rtx_insn *.
	(shorten_branches): Use dyn_cast instead of LABEL_P and
	JUMP_TABLE_DATA_P.  Use jump_table_for_label and
	rtx_jump_table_data::get_data_mode.
	(final_scan_insn): Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/final.c
    trunk/gcc/is-a.h
    trunk/gcc/rtl.h