[PATCH] New option for automatically generating IT blocks

[Daniel Gutson]

Hi,
  apologies again, this is the current version of the patch.

As I mentioned in the original post, with this patch the assembler allows use of conditional Thumb-2 instructions without requiring explicit IT instructions.

The patch adds the -mauto-it command-line option to enable this automatic generation of IT instructions. When not specified, the original behavior takes place.

I tested this by running the gas testsuite, plus the test cases I added. 

Please commit it for me if accepted, since I don't have write access.

Thanks,
  Daniel.

Daniel Gutson wrote:
> I just discovered that I submitted an old version of this patch.
> 
> My apologies, I'll resend the new one as soon as test finishes.
> 
> Thanks,
>     Daniel.
> 


2009-05-08  Daniel Gutson  <dgutson@codesourcery.com>

	gas/
	* config/tc-arm.c (do_automatic_it): New variable.
	(it_instruction_type): New enum.
	(arm_it): New field.
	(it_state): New enum.
	(current_it): New struct and global variable.
	(current_it_compatible): New function.
	(conditional_insn): New function.
	(set_it_insn_type): New macro.
	(set_it_insn_type_last): New macro.
	(do_t_add_sub): Call automatic IT machinery functions.
	(do_t_arit3): Likewise.
	(do_t_arit3c): Likewise.
	(do_t_blx): Likewise.
	(do_t_branch): Likewise.
	(do_t_bkpt): Likewise.
	(do_t_branch23): Likewise.
	(do_t_bx): Likewise.
	(do_t_bxj): Likewise.
	(do_t_cps): Likewise.
	(do_t_cpsi): Likewise.
	(do_t_cbz): Likewise.
	(do_t_it): Likewise.
	(encode_thumb2_ldmstm): Likewise.
	(do_t_ldst): Likewise.
	(do_t_mov_cmp): Likewise.
	(do_t_mvn_tst): Likewise.
	(do_t_mul): Likewise.
	(do_t_neg): Likewise.
	(do_t_setend): Likewise.
	(do_t_shift): Likewise.
	(do_t_tb): Likewise.
	(output_it_inst): New function.
	(new_automatic_it_block): New function.
	(close_automatic_it_block): New function.
	(current_it_add_mask): New function.
	(it_fsm_pre_encode): New function.
	(handle_it_state): New function.
	(it_fsm_post_encode): New function.
	(force_automatic_it_block_close): New function.
	(in_it_block): New function.
	(md_assemble): Call automatic IT block machinery functions.
	(arm_frob_label): Likewise.
	(arm_opts): New element.
	* doc/c-arm.texi: New option -mauto-it.

	gas/testsuite/
	* gas/arm/arm-it-auto.d: New test.
	* gas/arm/arm-it-auto.s: New file.
	* gas/arm/arm-it-auto-2.d: New test case.
	* gas/arm/arm-it-auto-2.s: New file.
 	* gas/arm/thumb2_it_auto.d: New test.
	* gas/arm/thumb2_it_bad.l: Error message updated.
	* gas/arm/thumb2_it_bad_auto.d: New test.
	* gas/arm/thumb2_it.d: Comment added.
	* gas/arm/thumb2_it_bad.d: Comment added.
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