[PATCH] Vzeroupper placement/47440

[Vladimir Yakovlev]

This removes current implementation of vzeroupper placement (including
emitting vzeroupper in expand and epilog phases and replacement them
in mach phase) and performs optimal placement using mode switching
technique. New routines in i386.[ch] provides target  dependent part
using in mode-sw phase.
One change is in mode-switching.c fixing bootstrap problem; see new
test avx-vzeroupper-27.

Bootstrap and make check testing is passed.

I testd compiler

Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure
--prefix=/export/users/vbyakovl/workspaces/vzu/install-i386
--enable-clocale=gnu --with-system-zlib --enable-shared
--with-demangler-in-ld --with-fpmath=sse
--enable-languages=c,c++,fortran,java,lto,objc --with-arch=corei7-avx
--with-cpu=corei7-avx

Is it ok for trunck?

2012-11-04  Vladimir Yakovlev  <vladimir.b.yakovlev@intel.com>

        * mode-switching.c (create_pre_exit): Added code for
maybe_builtin_apply case.

        * config/i386/i386-protos.h (emit_i387_cw_initialization): Deleted.
        (emit_vzero): Added prototype.
        (ix86_mode_entry): Likewise.
        (ix86_mode_exit): Likewise.
        (ix86_emit_mode_set): Likewise.

        * config/i386/i386.c (VALID_AVX256_REG_OR_OI_MODE): New.
        (typedef struct block_info_def): Deleted.
        (define BLOCK_INFO): Deleted.
        (check_avx256_stores): Added checking for MEM_P.
        (move_or_delete_vzeroupper_2): Deleted.
        (move_or_delete_vzeroupper_1): Deleted.
        (move_or_delete_vzeroupper): Deleted.
        (ix86_maybe_emit_epilogue_vzeroupper): Deleted.
        (function_pass_avx256_p): Deleted.
        (ix86_function_ok_for_sibcall): Deleted disabling sibcall.
        (nit_cumulative_args): Deleted initialization of of avx256 fields of
        cfun->machine.
        (ix86_emit_restore_sse_regs_using_mov): Deleted vzeroupper generation.
        (ix86_expand_epilogue): Likewise.
        (is_vzeroupper): New.
        (is_vzeroall): New.
        (ix86_avx_u128_mode_needed): New.
        (ix86_i387_mode_needed): Renamed ix86_mode_needed.
        (ix86_mode_needed): New.
        (ix86_avx_u128_mode_after): New.
        (ix86_mode_after): New.
        (ix86_avx_u128_mode_entry): New.
        (ix86_mode_entry): New.
        (ix86_avx_u128_mode_exit): New.
        (ix86_mode_exit): New.
        (ix86_emit_vzeroupper): New.
        (ix86_emit_mode_set): New.
        (ix86_expand_call): Deleted vzeroupper generation.
        (ix86_split_call_vzeroupper): Deleted.
        (ix86_init_machine_status): Initialzed optimize_mode_switching.
        (ix86_expand_special_args_builtin): Changed.
        (ix86_reorg): Deleted a call of move_or_delete_vzeroupper.

        * config/i386/i386.h (AVX_U128): New.
        (avx_u128_state): New.
        (NUM_MODES_FOR_MODE_SWITCHING): Added AVX_U128_ANY.
        (MODE_AFTER): New.
        (MODE_ENTRY): New.
        (MODE_EXIT): New.
        (EMIT_MODE_SET): Changed.
        (machine_function): Deleted avx256 fields.

        * config/i386/i386.md (UNSPEC_CALL_NEEDS_VZEROUPPER): Deleted.
        (define_insn_and_split "*call_vzeroupper"): Deleted.
        (define_insn_and_split "*call_rex64_ms_sysv_vzeroupper"): Deleted.
        (define_insn_and_split "*sibcall_vzeroupper"): Deleted.
        (define_insn_and_split "*call_pop_vzeroupper"): Deleted.
        (define_insn_and_split "*sibcall_pop_vzeroupper"): Deleted.
        (define_insn_and_split "*call_value_vzeroupper"): Deleted.
        (define_insn_and_split "*sibcall_value_vzeroupper"): Deleted.
        (define_insn_and_split "*call_value_rex64_ms_sysv_vzeroupper"): Deleted.
        (define_insn_and_split "*call_value_pop_vzeroupper"): Deleted.
        (define_insn_and_split "*sibcall_value_pop_vzeroupper"): Deleted.
        (define_expand "return"): Deleted vzeroupper emitting.
        (define_expand "simple_return"): Deleted.

2012-11-04  Vladimir Yakovlev  <vladimir.b.yakovlev@intel.com>

        * gcc.target/i386/avx-vzeroupper-5.c: Changed scan-assembler-times.
        gcc.target/i386/avx-vzeroupper-8.c: Likewise.
        gcc.target/i386/avx-vzeroupper-9.c: Likewise.
        gcc.target/i386/avx-vzeroupper-10.c: Likewise.
        gcc.target/i386/avx-vzeroupper-11.c: Likewise.
        gcc.target/i386/avx-vzeroupper-12.c: Likewise.
        gcc.target/i386/avx-vzeroupper-19.c: Likewis.
        gcc.target/i386/avx-vzeroupper-27.c: New.
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