Hello Eric,

On 2013-09-19 09:23, Eric Botcazou wrote:
>> I don't expect that this will be back ported to GCC 4.8.  You also need
>> >Binutils 2.24 for this.
>From a SPARC maintainership viewpoint, I'd think that this is backportable for
> the upcoming 4.8.2 release, and the patches are essentially SPARC-specific,
> but perhaps the RMs are of a different opinion here.

I back ported your list of changes from mainline to GCC 4.8.  See the attached 
patches.  In addition to your proposed changes I had to add

2013-04-10  Steven Bosscher  <steven@gcc.gnu.org>

        * config/sparc/sparc.c: Include tree-pass.h.
        (TARGET_MACHINE_DEPENDENT_REORG): Do not redefine.
        (sparc_reorg): Rename to sparc_do_work_around_errata.  Move to
        head of file.  Change return type.  Split off gate function.
        (sparc_gate_work_around_errata): New function.
        (pass_work_around_errata): New pass definition.
        (insert_pass_work_around_errata) New pass insert definition to
        insert pass_work_around_errata just after delayed-branch scheduling.
        (sparc_option_override): Insert the pass.
        * config/sparc/t-sparc (sparc.o): Add TREE_PASS_H dependence.

This was necessary for

2013-07-22  Eric Botcazou  <ebotcazou@adacore.com>

	* config.gcc (sparc*-*-*): Accept leon3 processor.
	(sparc-leon*-*): Merge with sparc*-*-* and add leon3 support.
	* doc/invoke.texi (SPARC Options): Adjust -mfix-ut699 entry.
	* config/sparc/sparc-opts.h (enum processor_type): Add PROCESSOR_LEON3.
	* config/sparc/sparc.opt (enum processor_type): Add leon3.
	(mfix-ut699): Adjust comment.
	* config/sparc/sparc.h (TARGET_CPU_leon3): New define.
	(CPP_CPU32_DEFAULT_SPEC): Add leon3 support.
	(CPP_CPU_SPEC): Likewise.
	(ASM_CPU_SPEC): Likewise.
	* config/sparc/sparc.c (leon3_cost): New constant.
	(sparc_option_override): Add leon3 support.
	(mem_ref): New function.
	(sparc_gate_work_around_errata): Return true if -mfix-ut699 is enabled.
	(sparc_do_work_around_errata): Look into the instruction in the delay
	slot and adjust accordingly.  Add fix for the data cache nullify issues
	of the UT699.  Change insertion position for the NOP.
	* config/sparc/leon.md (leon_fpalu, leon_fpmds, write_buf): Delete.
	(leon3_load): New reservation.
	(leon_store): Bump latency to 2.
	(grfpu): New automaton.
	(grfpu_alu): New unit.
	(grfpu_ds): Likewise.
	(leon_fp_alu): Adjust.
	(leon_fp_mult): Delete.
	(leon_fp_div): Split into leon_fp_divs and leon_fp_divd.
	(leon_fp_sqrt): Split into leon_fp_sqrts and leon_fp_sqrtd.
	* config/sparc/sparc.md (cpu): Add leon3.
	* config/sparc/sync.md (atomic_exchangesi): Disable if -mfix-ut699.
	(swapsi): Likewise.
	(atomic_test_and_set): Likewise.
	(ldstub): Likewise.

I cannot judge if this was good or bad.  I can only perform mechanical changes 
since I don't know how the compiler works.

I run the GCC test suite on the GDB SIS with RTEMS, but its hard for me to 
interpret the results.  I think there are no new test failures due to the back 
ports.

-- 
Sebastian Huber, embedded brains GmbH

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