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invoke.texi (ffat-lto-objects): Document.
* doc/invoke.texi (ffat-lto-objects): Document. * toplev.c (compile_file): Do not output assembly when doing slim lto; Output __gnu_slim_lto when doing slim lto. * cgraphunit.c (ipa_passes): Do only analysis when producing slim lto. (cgraph_optimize): Return early when doing slim lto. * opts.c (finish_options): Complain about lack of linker plugin when doing slim lto. * common.opt (ffat-lto-objects): New. Co-Authored-By: Jan Hubicka <jh@suse.cz> From-SVN: r179271
This commit is contained in:
Andi Kleen
Jan Hubicka
parent
3019bbaeb3
commit
cc8547a776
@ -1,3 +1,15 @@
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2011-09-27 Andi Kleen <ak@linux.intel.com>
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Jan Hubicka <jh@suse.cz>
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* doc/invoke.texi (ffat-lto-objects): Document.
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* toplev.c (compile_file): Do not output assembly when doing slim lto;
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Output __gnu_slim_lto when doing slim lto.
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* cgraphunit.c (ipa_passes): Do only analysis when producing slim lto.
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(cgraph_optimize): Return early when doing slim lto.
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* opts.c (finish_options): Complain about lack of linker plugin
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when doing slim lto.
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* common.opt (ffat-lto-objects): New.
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2011-09-27 Richard Sandiford <richard.sandiford@linaro.org>
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* ipa-inline-analysis.c (predicate_probability): Avoid comparison
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@ -2042,7 +2042,7 @@ ipa_passes (void)
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if (flag_generate_lto)
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targetm.asm_out.lto_end ();
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if (!flag_ltrans)
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if (!flag_ltrans && (in_lto_p || !flag_lto || flag_fat_lto_objects))
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execute_ipa_pass_list (all_regular_ipa_passes);
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invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_END, NULL);
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@ -2080,8 +2080,9 @@ cgraph_optimize (void)
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if (!seen_error ())
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ipa_passes ();
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/* Do nothing else if any IPA pass found errors. */
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if (seen_error ())
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/* Do nothing else if any IPA pass found errors or if we are just streaming LTO. */
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if (seen_error ()
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|| (!in_lto_p && flag_lto && !flag_fat_lto_objects))
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{
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timevar_pop (TV_CGRAPHOPT);
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return;
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@ -1087,6 +1087,10 @@ Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
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ffast-math
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Common
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ffat-lto-objects
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Common Var(flag_fat_lto_objects) Init(1)
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Output lto objects containing both the intermediate language and binary output.
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ffinite-math-only
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Common Report Var(flag_finite_math_only) Optimization SetByCombined
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Assume no NaNs or infinities are generated
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@ -355,8 +355,8 @@ Objective-C and Objective-C++ Dialects}.
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-fcx-limited-range @gol
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-fdata-sections -fdce -fdce -fdelayed-branch @gol
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-fdelete-null-pointer-checks -fdse -fdevirtualize -fdse @gol
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-fearly-inlining -fipa-sra -fexpensive-optimizations -ffast-math @gol
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-ffinite-math-only -ffloat-store -fexcess-precision=@var{style} @gol
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-fearly-inlining -fipa-sra -fexpensive-optimizations -ffat-lto-objects @gol
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-ffast-math -ffinite-math-only -ffloat-store -fexcess-precision=@var{style} @gol
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-fforward-propagate -ffp-contract=@var{style} -ffunction-sections @gol
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-fgcse -fgcse-after-reload -fgcse-las -fgcse-lm -fgraphite-identity @gol
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-fgcse-sm -fif-conversion -fif-conversion2 -findirect-inlining @gol
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@ -7891,6 +7891,22 @@ use it.
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Enabled by default when LTO support in GCC is enabled and GCC was compiled
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with a linker supporting plugins (GNU ld 2.21 or newer or gold).
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@item -ffat-lto-objects
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@opindex ffat-lto-objects
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Fat LTO objects are object files that contain both the intermediate language
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and the object code. This makes them useable for both LTO linking and normal
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linking. This option makes effect only with @option{-flto} and is ignored
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at linktime.
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@option{-fno-fat-lto-objects} improves compilation time over plain LTO, but
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requires the complete toolchain to be aware of LTO. It requires a linker with
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linker plugin support for basic functionality. Additionally, nm, ar and ranlib
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need to support linker plugins to allow a full-featured build environment
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(capable of building static libraries etc).
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The default is @option{-ffat-lto-objects} but this default is intended to
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change in future releases when linker plugin enabled environments become more
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common.
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@item -fcompare-elim
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@opindex fcompare-elim
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After register allocation and post-register allocation instruction splitting,
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@ -779,7 +779,9 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
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#else
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error_at (loc, "LTO support has not been enabled in this configuration");
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#endif
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}
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if (!opts->x_flag_fat_lto_objects && !HAVE_LTO_PLUGIN)
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error_at (loc, "-fno-fat-lto-objects are supported only with linker plugin.");
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}
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if ((opts->x_flag_lto_partition_balanced != 0) + (opts->x_flag_lto_partition_1to1 != 0)
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+ (opts->x_flag_lto_partition_none != 0) >= 1)
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{
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70
gcc/toplev.c
70
gcc/toplev.c
@ -569,40 +569,45 @@ compile_file (void)
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return;
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}
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varpool_assemble_pending_decls ();
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finish_aliases_2 ();
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/* Compilation unit is finalized. When producing non-fat LTO object, we are
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basically finished. */
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if (in_lto_p || !flag_lto || flag_fat_lto_objects)
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{
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varpool_assemble_pending_decls ();
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finish_aliases_2 ();
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/* Likewise for mudflap static object registrations. */
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if (flag_mudflap)
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mudflap_finish_file ();
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/* Likewise for mudflap static object registrations. */
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if (flag_mudflap)
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mudflap_finish_file ();
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output_shared_constant_pool ();
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output_object_blocks ();
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output_shared_constant_pool ();
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output_object_blocks ();
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/* Write out any pending weak symbol declarations. */
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weak_finish ();
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/* Write out any pending weak symbol declarations. */
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weak_finish ();
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/* This must be at the end before unwind and debug info.
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Some target ports emit PIC setup thunks here. */
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targetm.asm_out.code_end ();
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/* This must be at the end before unwind and debug info.
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Some target ports emit PIC setup thunks here. */
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targetm.asm_out.code_end ();
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/* Do dbx symbols. */
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timevar_push (TV_SYMOUT);
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/* Do dbx symbols. */
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timevar_push (TV_SYMOUT);
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#if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
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if (dwarf2out_do_frame ())
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dwarf2out_frame_finish ();
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#endif
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#if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
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if (dwarf2out_do_frame ())
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dwarf2out_frame_finish ();
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#endif
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(*debug_hooks->finish) (main_input_filename);
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timevar_pop (TV_SYMOUT);
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(*debug_hooks->finish) (main_input_filename);
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timevar_pop (TV_SYMOUT);
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/* Output some stuff at end of file if nec. */
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/* Output some stuff at end of file if nec. */
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dw2_output_indirect_constants ();
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dw2_output_indirect_constants ();
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/* Flush any pending external directives. */
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process_pending_assemble_externals ();
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/* Flush any pending external directives. */
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process_pending_assemble_externals ();
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}
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/* Emit LTO marker if LTO info has been previously emitted. This is
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used by collect2 to determine whether an object file contains IL.
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@ -623,6 +628,23 @@ compile_file (void)
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(unsigned HOST_WIDE_INT) 1,
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(unsigned HOST_WIDE_INT) 1);
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#endif
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/* Let linker plugin know that this is a slim object and must be LTOed
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even when user did not ask for it. */
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if (!flag_fat_lto_objects)
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{
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#if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
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ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
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"__gnu_slim_lto",
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(unsigned HOST_WIDE_INT) 1, 8);
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#elif defined ASM_OUTPUT_ALIGNED_COMMON
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ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_slim_lto",
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(unsigned HOST_WIDE_INT) 1, 8);
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#else
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ASM_OUTPUT_COMMON (asm_out_file, "__gnu_slim_lto",
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(unsigned HOST_WIDE_INT) 1,
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(unsigned HOST_WIDE_INT) 1);
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#endif
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}
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}
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/* Attach a special .ident directive to the end of the file to identify
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