[Bug rtl-optimization/52543] lower-subreg.c: code bloat of 300%-400% for multi-word memory splits

["gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52543

--- Comment #5 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-03-22 15:07:29 UTC ---
Author: gjl
Date: Thu Mar 22 15:06:57 2012
New Revision: 185697

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185697
Log:
libgcc/
    Backport from 2012-03-07 mainline r185033.

    PR target/52507
    * config/avr/lib1funcs.S (__movmemx_hi): Fix loop label in RAM-part.

    Backport from 2012-03-07 mainline r185031.

    PR target/52505
    * config/avr/lib1funcs.S (__xload_1): Don't read unintentionally
    from RAM.

    Backport from 2012-03-07 mainline r185030.

    PR target/52461
    PR target/52508
    * config/avr/lib1funcs.S (__do_copy_data): Clear RAMPZ after usage
    if RAMPZ affects reading from RAM.
    (__tablejump_elpm__): Ditto.
    (.xload): Ditto.
    (__movmemx_hi): Ditto.
    (__do_global_ctors): Right condition for RAMPZ usage is "have ELPM".
    (__do_global_dtors): Ditto.
    (__xload_1, __xload_2, __xload_3, __xload_4): Ditto.
    (__movmemx_hi): Ditto.

gcc/
    Backport from 2012-03-22 mainline r185692.

    PR target/52496
    * config/avr/avr.md (unspec): Remove UNSPEC_MEMORY_BARRIER.
    (unspecv): Add UNSPECV_MEMORY_BARRIER.
    (cli_sei): Use unspec_volatile instead of unspec for memory barrier.
    (delay_cycles_1, delay_cycles_2): Ditto.
    (delay_cycles_3, delay_cycles_4): Ditto.
    (nopv, *nopv): Ditto.
    (sleep, *sleep): Ditto.
    (wdr, *wdr): Ditto.

    Backport from 2012-03-21 mainline r185605.

    PR rtl-optimization/52543
    PR target/52461
    * config/avr/avr-protos.h (avr_load_lpm): New prototype.
    * config/avr/avr.c (avr_mode_dependent_address_p): New function.
    (TARGET_MODE_DEPENDENT_ADDRESS_P): New define.
    (avr_load_libgcc_p): Restrict to __flash loads.
    (avr_out_lpm): Only handle 1-byte loads from __flash.
    (avr_load_lpm): New function.
    (avr_find_unused_d_reg): Remove.
    (avr_out_lpm_no_lpmx): Remove.
    (adjust_insn_length): Handle ADJUST_LEN_LOAD_LPM.
    * config/avr/avr.md (unspec): Add UNSPEC_LPM.
    (load_<mode>_libgcc): Use UNSPEC_LPM instead of MEM.
    (load_<mode>, load_<mode>_clobber): New insns.
    (mov<mode>): For multi-byte move from non-generic
    16-bit address spaces: Expand to load_<mode> resp.
    load_<mode>_clobber.
    (load<mode>_libgcc): Remove expander.
    (split-lpmx): Remove split.

    Backport from 2012-03-13 mainline r185329.

    PR target/52488
    * config/avr/avr.c (avr_prologue_setup_frame): Cut down stack
    offset (size) to a value the insns can deal with.
    (expand_epilogue): Ditto.

    Backport from 2012-03-12 mainline r185256.

    PR target/52499
    * config/avr/avr.c (avr_mode_code_base_reg_class): Change return
    type from reg_class_t to enum reg_class.
    * config/avr/avr-protos.h (avr_mode_code_base_reg_class): Ditto.

    Backport from 2012-03-12 mainline r185253.

    PR target/52148
    * config/avr/avr.c (avr_out_movmem): Fix typo in output template
    for the case ADDR_SPACE_FLASH and AVR_HAVE_LPMX introduced in
    r184615 from 2012-02-28.

    Backport from 2012-03-08 mainline r185105.

    * config/avr/avr.md (*addhi3, addhi3_clobber): Add "w" alternative
    for constants in [-63,63].

    Backport from 2012-03-08 mainline r185100.

    PR target/52496
    * config/avr/avr.c (avr_mem_clobber): New static function.
    (avr_expand_delay_cycles): Add memory clobber operand to
    delay_cycles_1, delay_cycles_2, delay_cycles_3, delay_cycles_4.
    * config/avr/avr.md (unspec): Add UNSPEC_MEMORY_BARRIER.
    (enable_interrupt, disable_interrupt): New expander.
    (nopv, sleep, wdr): New expanders.
    (delay_cycles_1): Add memory clobber.
    (delay_cycles_2): Add memory clobber.
    (delay_cycles_3): Add memory clobber.
    (delay_cycles_4): Add memory clobber.
    (cli_sei): New insn from former "enable_interrupt",
    "disable_interrupt" with memory clobber.
    (*wdt): New insn from former "wdt" with memory clobber.
    (*nopv): Similar, but for "nopv".
    (*sleep): Similar, but for "sleep".

    Backport from 2012-03-07 mainline r185043.

    PR target/52484
    * config/avr/avr.md (xload<mode>_A): Add R22... to register footprint.

    Backport from 2012-03-07 mainline r185032.

    PR target/52506
    * gcc/config/avr/avr.c (expand_epilogue): Fix order of restoration
    to: RAMPZ, RAMPY, RAMPX, RAMPD.
    (expand_prologue): Only clear RAMPZ if it has effect on RAM-read.

    Backport from 2012-03-07 mainline r185031.

    PR target/52505
    * config/avr/avr.c (avr_out_xload): Don't read unintentionally
    from RAM.
    * config/avr/avr.md (xload_8): Adjust insn length.

    Backport from 2012-03-07 mainline r185030.

    PR target/52461
    * gcc/config/avr/avr.c (avr_out_lpm): Clear RAMPZ after usage
    if RAMPZ affects reading from RAM.

    Backport from 2012-03-05 mainline r184919.

    * config/avr/avr.md (*umaddqihi4.2): New insn-and-split.


Modified:
    branches/gcc-4_7-branch/gcc/ChangeLog
    branches/gcc-4_7-branch/gcc/config/avr/avr-protos.h
    branches/gcc-4_7-branch/gcc/config/avr/avr.c
    branches/gcc-4_7-branch/gcc/config/avr/avr.md
    branches/gcc-4_7-branch/libgcc/ChangeLog
    branches/gcc-4_7-branch/libgcc/config/avr/lib1funcs.S