add support for new Xtensa wide branch feature

[Bob Wilson]

Some future Xtensa processors will include "wide" branch instructions with 
larger immediate fields.  This patch adds support in GAS for relaxing the 
smaller branches into the wide versions when the branch targets are out of 
range.  Tested with an xtensa-elf build and committed on the mainline.

include ChangeLog:
2005-12-30  Bob Wilson  <bob.wilson@acm.org>

	* xtensa-config.h (XCHAL_HAVE_WIDE_BRANCHES): New.

gas ChangeLog:
2005-12-30  Sterling Augustine  <sterling@tensilica.com>
	    Bob Wilson  <bob.wilson@acm.org>

	* config/tc-xtensa.c (op_placement_info_struct): Delete single,
	single_size, widest, and widest_size fields.  Add narrowest_slot.
	(xg_emit_insn_to_buf): Remove fmt parameter and compute it here.
	Use xg_get_single_slot to find the slot.
	(finish_vinsn): Use emit_single_op instead of bundle_single_op.
	(bundle_single_op): Rename this to....
	(bundle_tinsn): ...this function, which builds a vliw_insn but does
	not call finish_vinsn.
	(emit_single_op): Use bundle_tinsn instead of bundle_single_op.
	(relax_frag_immed): Get num_slots from cur_vinsn.
	(convert_frag_narrow): Update call to xg_emit_insn_to_buf.
	(convert_frag_immed): Likewise.  Also, get num_slots from cur_vinsn.
	(init_op_placement_info_table): Set narrowest_slot field.  Remove
	code for deleted fields.
	(xg_get_single_size): Return narrowest_size field, not single_size.
	(xg_get_single_format): Return narrowest field, not single.
	(xg_get_single_slot): New.
	(tinsn_to_insnbuf): Rewrite to use tinsn_to_slotbuf.
	* config/xtensa-relax.c (widen_spec_list): Add wide branch relaxations.
	(transition_applies): Check wide branch option availability.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: gas-wide-branches.diff
Type: text/x-patch
Size: 19540 bytes
Desc: not available
URL: <https://sourceware.org/pipermail/binutils/attachments/20051230/2ac2b0de/attachment.bin>