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2003-10-11Makefile.in (web.o): New.Jan Hubicka13-11/+419
* Makefile.in (web.o): New. * web.c: New file. * rtl.h (web_main): Declare. * timervar.def (TV_WEB): New. * toplev.c (dump_file_index, dump_file_info): Add DFI_web. (rest_of_hanle_web): New. (flag_web): New static variable. (lang_independent_options): Add "web". (rest_of_compilation): Call rest_of_handle_web. * invoke.texi (-fweb): Document. * common.opt (fweb): New. * flags.h (flag_web): New. * opts.c (decode_options): Set flag_web at -O3. * passes.texi (web construction): Document. * invoke.texi (-O3): Document that -fweb is enabled. * regrename.c (regrename_optimize): Deal better with situation when replacement failed. * sched-ebb.c: Include params.h and profile.h (schedule_ebbs): Use tracer parameters to discover superblocks * Makefile.in (sched-ebb.o): Add dependencies. From-SVN: r72383
2003-10-11fold-const.c (negate_mathfn_p): New function to determine whether a built-in ↵Roger Sayle2-81/+177
mathematical function is sign... * fold-const.c (negate_mathfn_p): New function to determine whether a built-in mathematical function is sign preserving, f(-x) == -f(x). Add support for BUILT_IN_ASIN, BUILT_IN_ASINF and BUILT_IN_ASINL. (tree_swap_operands_p): Change API to take an additional argument indicating that the swapped operands evaluate in reverse order. Canonicalize VAR_DECLs and PARM_DECLs last if we can, i.e. neither operand side-effects or we don't care about flag_evaluation_order. (reorder_operands_p): New function to check whether its safe to evaluate the given operands in reverse order. (negate_expr_p): We can always negate integer constants unless we honor -ftrapv and the signed type would overflow. Only allow -(A-B) into B-A if reorder_operands_p says that its OK. Allow negation of COMPLEX_CST if both real and imaginary parts can be negated. Allow negation through floating point extensions and sign-preserving built-in functions. (negate_expr): Move the code to negate integers from "fold" to here. Always negate integer constants unless we honor -ftrapv and the signed type would overflow. Always negate real constants unless we honor -ftrapping-math. Only convert -(A-B) into B-A if allowed by reorder_operands_p. Add support for COMPLEX_CST. Optimize negation through floating point extensions and sign-preserving built-in functions (as defined by negate_mathfn_p). (fold): Adjust calls to tree_swap_operands_p. (fold <NEGATE_EXPR>): Move the remaining negation optimizations to negate_expr_p/negate_expr. (fold <MINUS_EXPR>): Use reorder_operands_p to check whether we're allowed to convert (-A) - B into (-B) - A. From-SVN: r72381
2003-10-11builtins.c (expand_builtin_strcmp): Defend against the possibility that ↵Roger Sayle5-27/+70
gen_cmpstrsi may fail... * builtins.c (expand_builtin_strcmp): Defend against the possibility that gen_cmpstrsi may fail: Stabilize the argument list against re-evaluation and expand the library call directly using this saved argument list if a cmpstrsi sequence can't be generated. (expand_builtin_strncmp): Likewise. * config/i386/i386.md (cmpstrsi, movstrsi): Disable with -Os. * gcc.c-torture/execute/string-opt-8.c: Don't test optimizations that inline strncmp as cmpstrsi on i386 when compiled with -Os. From-SVN: r72380
2003-10-11re PR rtl-optimization/12260 (ICE in output_operand: invalid expression as ↵Roger Sayle4-1/+62
operand) PR optimization/12260 * simplify-rtx.c (simplify_unary_operation): Simplify all unary operations through CONST nodes. Optimize (neg (plus X C)) as (minus -C X) for constant values C. (simplify_binary_operation): Optimize (minus (neg X) C) as (minus -C X) for constant values C. (simplify_plus_minus): Avoid creating (neg (const (plus X C)), instead create (minus -C X). * gcc.c-torture/compile/20031011-2.c: New test case. From-SVN: r72379
2003-10-11expr.c (expand_expr <PLUS_EXPR>): Let expand_operands call safe_from_p for ↵Roger Sayle4-9/+53
us, once it chooses an evaluation order. * expr.c (expand_expr <PLUS_EXPR>): Let expand_operands call safe_from_p for us, once it chooses an evaluation order. (expand_expr <MULT_EXPR>): Likewise. (expand_expr <MIN_EXPR> <MAX_EXPR>): Likewise. If expand_operands places the second operand in "target", swap the operands. (do_store_flag): Let expand_operands call safe_from_p for us. * gcc.c-torture/execute/20031011-1.c: New testcase. From-SVN: r72376
2003-10-11re PR rtl-optimization/12544 (ICE with large parameters used in nested ↵Eric Botcazou4-5/+38
functions) PR optimization/12544 * function.c (put_var_into_stack): Don't generate ADDRESSOFs for DECL_NONLOCAL decls. From-SVN: r72374
2003-10-11expr.c: Follow spelling conventions.Kazu Hirata6-5/+13
* expr.c: Follow spelling conventions. * final.c: Likewise. * optabs.c: Likewise. * sched-deps.c: Likewise. * sdbout.c: Likewise. From-SVN: r72361
2003-10-11* g++.dg/other/first-global.C: New test.Jan Hubicka2-0/+8
From-SVN: r72344
2003-10-11varasm.c (notice_global_symbol): Fix handling of variables; avoid ↵Jan Hubicka2-11/+24
re-computing of variable. * varasm.c (notice_global_symbol): Fix handling of variables; avoid re-computing of variable. From-SVN: r72343
2003-10-11alpha.c (alpha_return_in_memory): Rename from return_in_memory, make static, ↵Richard Henderson6-108/+90
change signature to match target hook. * config/alpha/alpha.c (alpha_return_in_memory): Rename from return_in_memory, make static, change signature to match target hook. (alpha_setup_incoming_varargs): Make static, change signature to match target hook, add code for vms and unicos. (TARGET_PROMOTE_FUNCTION_ARGS, TARGET_PROMOTE_FUNCTION_RETURN, TARGET_PROMOTE_PROTOTYPES, TARGET_STRUCT_VALUE_RTX, TARGET_RETURN_IN_MEMORY, TARGET_SETUP_INCOMING_VARARGS, TARGET_STRICT_ARGUMENT_NAMING, TARGET_PRETEND_OUTGOING_VARARGS_NAMED): New. * config/alpha/alpha-protos.h: Update. * config/alpha/alpha.h (PROMOTE_FUNCTION_ARGS, PROMOTE_FUNCTION_RETURN, RETURN_IN_MEMORY, SETUP_INCOMING_VARARGS): Remove. * config/alpha/unicosmk.h (SETUP_INCOMING_VARARGS): Remove. * config/alpha/vms.h (SETUP_INCOMING_VARARGS): Remove. From-SVN: r72338
2003-10-11* config/arm/arm.c (arm_regno_class): Handle IWMMXT_GR_REGS.Ian Lance Taylor2-0/+7
From-SVN: r72337
2003-10-11lb1sf68.asm: Follow spelling conventions.Kazu Hirata5-23/+30
* config/m68k/lb1sf68.asm: Follow spelling conventions. * config/m68k/m68k.c: Likewise. * config/m68k/m68k.h: Likewise. * config/m68k/m68k.md: Likewise. From-SVN: r72336
2003-10-11builtins.c (expand_builtin_memcpy): Optimize case when the two pointer ↵Roger Sayle4-5/+160
arguments are the equal... * builtins.c (expand_builtin_memcpy): Optimize case when the two pointer arguments are the equal, non-volatile and side-effect free. (expand_builtin_mempcpy): Likewise. (expand_builtin_memmove): Likewise. (expand_builtin_strcpy): Likewise. (expand_builtin_memcmp): Likewise. (expand_builtin_strcmp): Likewise. (expand_builtin_strncmp): Likewise. * gcc.c-torture/execute/string-opt-18.c: New testcase. From-SVN: r72335
2003-10-11combine.c (apply_distributive_law): Enable "distributive" floating point ↵Roger Sayle2-6/+12
optimizations with -funsafe-math-optimizations. * combine.c (apply_distributive_law): Enable "distributive" floating point optimizations with -funsafe-math-optimizations. From-SVN: r72334
2003-10-11+2003-10-11 Andrew Pinski <pinskia@physics.uc.edu>Andrew Pinski2-4/+8
+ + * genmodes.c (emit_mode_mask) Change MASK to MODE_MASK. From-SVN: r72333
2003-10-11m68k-protos.h: Remove the prototype for finalize_pic.Kazu Hirata2-3/+5
* config/m68k/m68k-protos.h: Remove the prototype for finalize_pic. From-SVN: r72332
2003-10-11* config/m68k/m68k.c: Fix comment typos.Kazu Hirata2-3/+7
From-SVN: r72331
2003-10-11m68k-protos.h (use_return_insn): Change return type from int to bool.Bernardo Innocenti3-182/+166
* config/m68k/m68k-protos.h (use_return_insn): Change return type from int to bool. * config/m68k/m68k.c (struct m68k_frame): Add funcdef_no member. (current_frame): New global var. (m68k_compute_frame_layout): Cache computations in current_frame. (m68k_initial_elimination_offset): Use values from current_frame instead of recomputing them. (use_return_insn): Likewise. (m68k_output_function_prologue): Likewise. (m68k_output_function_epilogue): Likewise. * config/m68k/m68k.h (TARGET_CPU_CPP_PREDEFINES): Fold __PIC__ handling inside the block for __pic__. From-SVN: r72330
2003-10-11m68k.c (m68k_frame): Move before protos referencing it.Peter Barada2-48/+122
* config/m68k/m68k.c (m68k_frame): Move before protos referencing it. (m68k_save_reg): Add boolean parameter `interrupt_handler'. (m68k_interrupt_function_p): New function. (m68k_handle_fndecl_attribute): Ditto. (m68k_compute_frame_layout): Ditto. (m68k_attribute_table): Define back-end specific attributes. (m68k_output_function_epilogue): Emit RTE instruction for interrupt functions. Co-Authored-By: Bernardo Innocenti <bernie@develer.com> From-SVN: r72329
2003-10-11t-uclinux: New target Makefile fragment.Bernardo Innocenti4-0/+99
* config/m68k/t-uclinux: New target Makefile fragment. * config/m68k/uclinux.h: New target macro file. * config.gcc (m68k-*-uclinux): New target definition. From-SVN: r72328
2003-10-11builtins.c (builtin_mathfn_code): Generalize to check whether the call is to ↵Roger Sayle2-24/+52
any built-in function by comparing... * builtins.c (builtin_mathfn_code): Generalize to check whether the call is to any built-in function by comparing the call's argument list against the builtin decl's function type. From-SVN: r72327
2003-10-11cse.c (constant_pool_entries_regcost): New global variable to hold the ↵Roger Sayle3-3/+44
register cost component of... * cse.c (constant_pool_entries_regcost): New global variable to hold the register cost component of constant_pool_entries_cost. (fold_rtx): Calculate constant_pool_entries_regcost at the same time as constant_pool_entries_cost. (cse_insn): Set both src_folded_cost and src_folded_regcost from constant_pool_entries_cost and constant_pool_entries_regcost. (cse_main): Initialize constant_pool_entries_regcost to zero. * optabs.c (expand_unop): Attach a REG_EQUAL note describing the semantics of the sequence of bit operations used to negate a floating-point value. (expand_abs_nojump): Likewise attach a REG_EQUAL note describing the semantics of the bit operations used to abs a floating point value. From-SVN: r72326
2003-10-11lb1sf68.asm: Add __PIC__ and __ID_SHARED_LIBRARY__ support.Bernardo Innocenti7-120/+276
* config/m68k/lb1sf68.asm: Add __PIC__ and __ID_SHARED_LIBRARY__ support. * config/m68k/m68k-none.h (ASM_SPEC): Pass --pcrel to assembler on -fpic, -fPIC, -msep-data and -mid-shared-library. * config/m68k/m68k.c (m68k_library_id_string): New global variable. (override_options): Add -msep-data and -mshared-library-id support. (m68k_output_function_prologue): Generate code to load A5 for TARGET_ID_SHARED_LIBRARY and TARGET_SEP_DATA. (m68k_output_mi_thunk): Emit indirect jump on TARGET_ID_SHARED_LIBRARY. (m68k_output_pic_call): New function. * gcc/config/m68k/m68k.h (TARGET_SEP_DATA): New target flag. (TARGET_ID_SHARED_LIBRARY): Ditto. (TARGET_SWITCHES): Add switches for -mid-shared-library and -msep-data. * gcc/config/m68k/m68k.md (call): Call m68k_output_pic_call(). (call_value): Likewise. From-SVN: r72324
2003-10-11m68k.c (m68k_frame): Move before protos referencing it.Bernardo Innocenti1-0/+12
* config/m68k/m68k.c (m68k_frame): Move before protos referencing it. (m68k_save_reg): Add boolean parameter `interrupt_handler'. (m68k_interrupt_function_p): New function. (m68k_handle_fndecl_attribute): Ditto. (m68k_compute_frame_layout): Ditto. (m68k_attribute_table): Define back-end specific attributes. (m68k_output_function_epilogue): Emit RTE instruction for interrupt functions. From-SVN: r72323
2003-10-11gengenrtl.c (find_formats, genheader): Make i an unsigned int, remove cast ↵Zack Weinberg3-25/+23
of NUM_RTX_CODE. * gengenrtl.c (find_formats, genheader): Make i an unsigned int, remove cast of NUM_RTX_CODE. * machmode.h: Make the HAVE_MACHINE_MODES #ifdef encompass the entire file. Remove the #ifs on GET_MODE_MASK etc and GET_MODE_WIDER_MODE etc. From-SVN: r72321
2003-10-11Daily bump.GCC Administrator1-1/+1
From-SVN: r72319
2003-10-10ia64.c (ia64_vms_init_libfuncs): New function.Richard Kenner3-11/+43
* config/ia64/ia64.c (ia64_vms_init_libfuncs): New function. (ia64_output_function_prologue): Only write .prologue if --with-gnu-as. (ia64_initialize_trampoline): If not using GAS, declare trampoline as global. * config/ia64/ia64.h (ASM_APP_ON, ASM_APP_OFF): Add vers for not GAS. (ASM_OUTPUT_DEBUG_LABEL): Likewise. From-SVN: r72316
2003-10-10lcm.c (optimize_mode_switching): Change NORMAL_MODE to MODE_ENTRY and MODE_EXIT.Eric Christopher5-79/+139
2003-10-10 Eric Christopher <echristo@redhat.com> * lcm.c (optimize_mode_switching): Change NORMAL_MODE to MODE_ENTRY and MODE_EXIT. Add MODE_AFTER for insns that set mode. * config/sh/sh.h (MODE_ENTRY): New macro. (MODE_EXIT): Ditto. (MODE_AFTER): Ditto. * config/sh/sh.md: Change for MODE_AFTER. Add fp_set attribute. * doc/tm.texi: Document MODE_AFTER, MODE_ENTRY, and MODE_EXIT. From-SVN: r72315
2003-10-10genmodes.c, [...]: New files.Zack Weinberg1-6/+43
* genmodes.c, mode-classes.def: New files. * machmode.def: Rewritten to genmodes.c interface. * Makefile.in (extra_modes_file): New substitution variable. (MACHMODE_H): No longer includes machmode.def or @extra_modes_file@; instead, mode-classes.def and insn-modes.h. (BUILD_RTL): Add $(BUILD_PREFIX)insn-modes.o. (OBJS-common): Add insn-modes.o. (STAGESTUFF): Add insn-modes.c, insn-modes.h, s-modes, and genmodes$(build_exeext). (insn-modes.o, insn-modes.c, insn-modes.h, s-modes, genmodes.o, genmodes$(build_exeext), $(BUILD_PREFIX_1)insn-modes.o): New targets. (s-genrtl): Don't depend on $(RTL_BASE_H). (gengenrtl.o): Don't depend on coretypes.h, $(GTM_H), real.h, or $(RTL_BASE_H); just rtl.def. * gengenrtl.c: Don't include coretypes.h, tm.h, rtl.h, or real.h. Give fake definition of CONST_DOUBLE_FORMAT and substitute definition of NUM_RTX_CODE. Add casts to avoid warnings. * machmode.h: Include insn-modes.h, not machmode.def. Include mode-classes.def to define enum mode_class. Tweak definitions of GET_MODE_CLASS, GET_MODE_SIZE, GET_MODE_BITSIZE, GET_MODE_MASK, GET_MODE_INNER, GET_MODE_WIDER_MODE, GET_CLASS_NARROWEST_MODE. (inner_mode_array): Renamed mode_inner. (mode_base_align): New. * rtl.c (mode_name, mode_class, mode_bitsize, mode_size, mode_unit_size, mode_wider_mode, mode_mask_array, inner_mode_array, class_narrowest_mode): Delete definitions. * stor-layout.c (get_mode_alignment): Use mode_base_align. * real.h: Use MIN_MODE_FLOAT and MAX_MODE_FLOAT, not QFmode and TFmode, in real_format_for_mode and REAL_MODE_FORMAT. * config/ip2k/ip2k.h, config/iq2000/iq2000.h: No need to define BITS_PER_UNIT. * stor-layout.c (compute_record_mode): Don't force BLKmode if field is zero-length BLKmode. * expr.c (expand_expr, case COMPONENT_REF): Handle case of BLKmode zero-size references. * combine.c (distribute_links): Properly test for REG being set. From-SVN: r72314
2003-10-10genmodes.c, [...]: New files.Zack Weinberg11-302/+1154
* genmodes.c, mode-classes.def: New files. * machmode.def: Rewritten to genmodes.c interface. * Makefile.in (extra_modes_file): New substitution variable. (MACHMODE_H): No longer includes machmode.def or @extra_modes_file@; instead, mode-classes.def and insn-modes.h. (BUILD_RTL): Add $(BUILD_PREFIX)insn-modes.o. (OBJS-common): Add insn-modes.o. (STAGESTUFF): Add insn-modes.c, insn-modes.h, s-modes, and genmodes$(build_exeext). (insn-modes.o, insn-modes.c, insn-modes.h, s-modes, genmodes.o, genmodes$(build_exeext), $(BUILD_PREFIX_1)insn-modes.o): New targets. (s-genrtl): Don't depend on $(RTL_BASE_H). (gengenrtl.o): Don't depend on coretypes.h, $(GTM_H), real.h, or $(RTL_BASE_H); just rtl.def. * gengenrtl.c: Don't include coretypes.h, tm.h, rtl.h, or real.h. Give fake definition of CONST_DOUBLE_FORMAT and substitute definition of NUM_RTX_CODE. Add casts to avoid warnings. * machmode.h: Include insn-modes.h, not machmode.def. Include mode-classes.def to define enum mode_class. Tweak definitions of GET_MODE_CLASS, GET_MODE_SIZE, GET_MODE_BITSIZE, GET_MODE_MASK, GET_MODE_INNER, GET_MODE_WIDER_MODE, GET_CLASS_NARROWEST_MODE. (inner_mode_array): Renamed mode_inner. (mode_base_align): New. * rtl.c (mode_name, mode_class, mode_bitsize, mode_size, mode_unit_size, mode_wider_mode, mode_mask_array, inner_mode_array, class_narrowest_mode): Delete definitions. * stor-layout.c (get_mode_alignment): Use mode_base_align. * real.h: Use MIN_MODE_FLOAT and MAX_MODE_FLOAT, not QFmode and TFmode, in real_format_for_mode and REAL_MODE_FORMAT. * config/ip2k/ip2k.h, config/iq2000/iq2000.h: No need to define BITS_PER_UNIT. From-SVN: r72313
2003-10-10* gcc.c-torture/compile/20031010-1.c: New test.Ian Lance Taylor2-0/+8
From-SVN: r72312
2003-10-10stor-layout.c (compute_record_mode): Don't force BLKmode if field is ↵Richard Kenner3-6/+17
zero-length BLKmode. * stor-layout.c (compute_record_mode): Don't force BLKmode if field is zero-length BLKmode. * expr.c (expand_expr, case COMPONENT_REF): Handle case of BLKmode zero-size references. From-SVN: r72311
2003-10-10* combine.c (distribute_links): Properly test for REG being set.Richard Kenner2-0/+4
From-SVN: r72310
2003-10-10alpha.c (alpha_expand_block_mode): Don't use gen_lowpart and company except ↵Richard Kenner2-2/+8
for REG. * config/alpha/alpha.c (alpha_expand_block_mode): Don't use gen_lowpart and company except for REG. From-SVN: r72309
2003-10-10va-arg-24.c: Correct, and rename to...Geoffrey Keating2-2/+7
* gcc.c-torture/execute/va-arg-24.c: Correct, and rename to... * gcc.c-torture/execute/va-arg-25.c: ... here. From-SVN: r72307
2003-10-10Fix uses of old-style date format in ChangeLog (Jan Hubicka, twice).Nathanael Nerode1-2/+2
From-SVN: r72306
2003-10-10* pa64-hpux.h (LINK_SPEC): Use `-z' option with HP ld.John David Anglin2-2/+6
From-SVN: r72305
2003-10-10config.gcc (mips*-*-netbsd*): Remove content-free line.Nathanael Nerode2-2/+5
* config.gcc (mips*-*-netbsd*): Remove content-free line. Also fixed old-style ChangeLog date to be new-style. From-SVN: r72304
2003-10-10Fri Oct 10 18:54:39 CEST 2003 Herman A.J. ten Brugge <hermantenbrugge@home.nl>Herman A.J. ten Brugge2-0/+26
* gcov-io.h: Check BITS_PER_UNIT when defining gcov_unsigned_t, gcov_position_t and gcov_type. From-SVN: r72301
2003-10-10configure.in (HAVE_AS_TLS): Add sh-*-* and sh[34]*-*-* cases.Kaz Kojima3-0/+31
* configure.in (HAVE_AS_TLS): Add sh-*-* and sh[34]*-*-* cases. * configure: Regenerate. From-SVN: r72294
2003-10-10Daily bump.GCC Administrator1-1/+1
From-SVN: r72291
2003-10-09h8300.md (define_asm_attributes): Specify the length of an asm insn more ↵Kazu Hirata2-1/+10
precisely. * config/h8300/h8300.md (define_asm_attributes): Specify the length of an asm insn more precisely. From-SVN: r72289
2003-10-09* config/mips/iris6.h (SUBTARGET_CPP_SPEC): Define.Rainer Orth2-0/+9
From-SVN: r72288
2003-10-09xtensa.c (xtensa_dbx_register_number): Change first FP register number to 48 ↵Bob Wilson2-9/+9
and MAC16 accumulator to 0x210. * config/xtensa/xtensa.c (xtensa_dbx_register_number): Change first FP register number to 48 and MAC16 accumulator to 0x210. From-SVN: r72283
2003-10-09* g++.dg/ext/attrib8.C: Only run it on x86 targets.Mark Mitchell2-0/+5
From-SVN: r72280
2003-10-09decl.c (java_init_decl_processing): Declare signers field.Tom Tromey3-0/+7
* decl.c (java_init_decl_processing): Declare signers field. * class.c (make_class_data): Set signers field. From-SVN: r72270
2003-10-09config.gcc: Remove redundant thread_file setting clauses for various ↵Nathanael Nerode2-11/+5
*-*-linux* targets. * config.gcc: Remove redundant thread_file setting clauses for various *-*-linux* targets. From-SVN: r72269
2003-10-09* config/h8300/h8300.md (define_asm_attributes): New.Kazu Hirata2-0/+10
From-SVN: r72264
2003-10-09optabs.c (prepare_float_lib_cmp): Always attach a REG_EQUAL note to the ↵Roger Sayle2-58/+55
comparison... * optabs.c (prepare_float_lib_cmp): Always attach a REG_EQUAL note to the comparison, as emit_libcall_block calls copy_rtx on equiv. From-SVN: r72262
2003-10-09haifa-sched.c (ok_for_early_schedule): New function.Dorit Naishlos12-3/+514
* haifa-sched.c (ok_for_early_schedule): New function. (early_queue_to_ready): New function. (schedule_block): Allow early removal of insns from Q. (schedule_insn): Update INSN_TICK in case of premature issue. * common.opt (sched_stalled_insns): New flag. (sched_stalled_insns_dep): New flag. * flags.h: Same above flags. * opts.c: Same as above. * toplev.c: Same as above. * target.h (targetm.sched.is_costly_dependence): New hook. * target-def.h: Same as above. * config/rs6000/rs6000.h: (rs6000_sched_costly_dep): Support new flag -msched-costly-dep. (DEFAULT_SCHED_COSTLY_DEP): Define. * config/rs6000/rs6000.c: (rs6000_is_costly_dependence): New function. (is_load_insn, is_store_insn): New functions. (is_load_insn1, is_store_insn1, is_mem_ref): New functions. * doc/invoke.texi (-fsched-stalled-insns-dep) (-fsched-stalled-insns, -msched-costly-dep): Document options. * doc/tm.texi (is_costly_dependence): Define new scheduler target hook. From-SVN: r72261
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