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Fixed the do while formatting. Ok for trunk with this version? thanks, David On Tue, Aug 6, 2013 at 2:42 AM, Jan Hubicka <hubicka@ucw.cz> wrote: >> >>> 2013-08-02 Xinliang David Li <davidxl@google.com> >> >>> >> >>> * config/i386/stringop.def: New file. >> >>> * config/i386/stringop.opt: New file. >> >>> * config/i386/i386-opts.h: Include stringopt.def. >> >>> * config/i386/i386.opt: Include stringopt.opt. >> >>> * config/i386/i386.c (ix86_option_override_internal): >> >>> Override default size based stringop inline strategies >> >>> with options. >> >>> * config/i386/i386.c (ix86_parse_stringop_strategy_string): >> >>> New function. >> >>> >> >>> 2013-08-04 Xinliang David Li <davidxl@google.com> >> >>> >> >>> * testsuite/gcc.target/i386/memcpy-strategy-1.c: New test. >> >>> * testsuite/gcc.target/i386/memcpy-strategy-2.c: Ditto. >> >>> * testsuite/gcc.target/i386/memset-strategy-1.c: Ditto. >> >>> * testsuite/gcc.target/i386/memcpy-strategy-3.c: Ditto. > > The patch looks resonable to me in general. I wonder why we need to bring > all the cost tables non-const instead of just having writable storage for > the "current strategy" like we do with other flags anyway. > > Your strings are definitely more readable than the in-memory representation > I came up with. Perhaps we can even turn the cost tables into strings > for easier maintenance? I guess they are bit confusing for people > not familiar with a code. > > Honza >> >>> >> >>> >> >>> >> >>> >> >>> On Fri, Aug 2, 2013 at 9:21 PM, Xinliang David Li <davidxl@google.com> wrote: >> >>> > On x86_64, when the expected size of memcpy/memset is known (e.g, with >> >>> > FDO), libcall strategy is used with the size is > 8192. This value is >> >>> > hard coded, which makes it hard to do performance tuning. This patch >> >>> > adds two new parameters to do that. Potential usage includes >> >>> > per-application libcall strategy min-size tuning based on summary data >> >>> > with FDO (e.g, instruction workset size). >> >>> > >> >>> > Bootstrap and tested on x86_64/linux. Ok for trunk? >> >>> > >> >>> > thanks, >> >>> > >> >>> > David >> >>> > >> >>> > >> >>> > 2013-08-02 Xinliang David Li <davidxl@google.com> >> >>> > >> >>> > * params.def: New parameters. >> >>> > * config/i386/i386.c (ix86_option_override_internal): >> >>> > Override default libcall size limit with parameters. >> >> >> >>> Index: config/i386/stringop.def >> >>> =================================================================== >> >>> --- config/i386/stringop.def (revision 0) >> >>> +++ config/i386/stringop.def (revision 0) >> >>> @@ -0,0 +1,42 @@ >> >>> +/* Definitions for option handling for IA-32. >> >>> + Copyright (C) 2013 Free Software Foundation, Inc. >> >>> + >> >>> +This file is part of GCC. >> >>> + >> >>> +GCC is free software; you can redistribute it and/or modify >> >>> +it under the terms of the GNU General Public License as published by >> >>> +the Free Software Foundation; either version 3, or (at your option) >> >>> +any later version. >> >>> + >> >>> +GCC is distributed in the hope that it will be useful, >> >>> +but WITHOUT ANY WARRANTY; without even the implied warranty of >> >>> +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> >>> +GNU General Public License for more details. >> >>> + >> >>> +Under Section 7 of GPL version 3, you are granted additional >> >>> +permissions described in the GCC Runtime Library Exception, version >> >>> +3.1, as published by the Free Software Foundation. >> >>> + >> >>> +You should have received a copy of the GNU General Public License and >> >>> +a copy of the GCC Runtime Library Exception along with this program; >> >>> +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see >> >>> +<http://www.gnu.org/licenses/>. */ >> >>> + >> >>> +DEF_ENUM >> >>> +DEF_ALG (no_stringop, no_stringop) >> >>> +DEF_ENUM >> >>> +DEF_ALG (libcall, libcall) >> >>> +DEF_ENUM >> >>> +DEF_ALG (rep_prefix_1_byte, rep_byte) >> >>> +DEF_ENUM >> >>> +DEF_ALG (rep_prefix_4_byte, rep_4byte) >> >>> +DEF_ENUM >> >>> +DEF_ALG (rep_prefix_8_byte, rep_8byte) >> >>> +DEF_ENUM >> >>> +DEF_ALG (loop_1_byte, byte_loop) >> >>> +DEF_ENUM >> >>> +DEF_ALG (loop, loop) >> >>> +DEF_ENUM >> >>> +DEF_ALG (unrolled_loop, unrolled_loop) >> >>> +DEF_ENUM >> >>> +DEF_ALG (vector_loop, vector_loop) >> >>> Index: config/i386/i386.opt >> >>> =================================================================== >> >>> --- config/i386/i386.opt (revision 201458) >> >>> +++ config/i386/i386.opt (working copy) >> >>> @@ -316,6 +316,14 @@ mstack-arg-probe >> >>> Target Report Mask(STACK_PROBE) Save >> >>> Enable stack probing >> >>> >> >>> +mmemcpy-strategy= >> >>> +Target RejectNegative Joined Var(ix86_tune_memcpy_strategy) >> >>> +Specify memcpy expansion strategy when expected size is known >> >>> + >> >>> +mmemset-strategy= >> >>> +Target RejectNegative Joined Var(ix86_tune_memset_strategy) >> >>> +Specify memset expansion strategy when expected size is known >> >>> + >> >>> mstringop-strategy= >> >>> Target RejectNegative Joined Enum(stringop_alg) Var(ix86_stringop_alg) Init(no_stringop) >> >>> Chose strategy to generate stringop using >> >>> Index: config/i386/stringop.opt >> >>> =================================================================== >> >>> --- config/i386/stringop.opt (revision 0) >> >>> +++ config/i386/stringop.opt (revision 0) >> >>> @@ -0,0 +1,36 @@ >> >>> +/* Definitions for option handling for IA-32. >> >>> + Copyright (C) 2013 Free Software Foundation, Inc. >> >>> + >> >>> +This file is part of GCC. >> >>> + >> >>> +GCC is free software; you can redistribute it and/or modify >> >>> +it under the terms of the GNU General Public License as published by >> >>> +the Free Software Foundation; either version 3, or (at your option) >> >>> +any later version. >> >>> + >> >>> +GCC is distributed in the hope that it will be useful, >> >>> +but WITHOUT ANY WARRANTY; without even the implied warranty of >> >>> +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> >>> +GNU General Public License for more details. >> >>> + >> >>> +Under Section 7 of GPL version 3, you are granted additional >> >>> +permissions described in the GCC Runtime Library Exception, version >> >>> +3.1, as published by the Free Software Foundation. >> >>> + >> >>> +You should have received a copy of the GNU General Public License and >> >>> +a copy of the GCC Runtime Library Exception along with this program; >> >>> +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see >> >>> +<http://www.gnu.org/licenses/>. */ >> >>> + >> >>> +Enum(stringop_alg) String(rep_byte) Value(rep_prefix_1_byte) >> >>> + >> >>> +#undef DEF_ENUM >> >>> +#define DEF_ENUM EnumValue >> >>> + >> >>> +#undef DEF_ALG >> >>> +#define DEF_ALG(alg, name) Enum(stringop_alg) String(name) Value(alg) >> >>> + >> >>> +#include "stringop.def" >> >>> + >> >>> +#undef DEF_ENUM >> >>> +#undef DEF_ALG >> >>> Index: config/i386/i386.c >> >>> =================================================================== >> >>> --- config/i386/i386.c (revision 201458) >> >>> +++ config/i386/i386.c (working copy) >> >>> @@ -156,7 +156,7 @@ struct processor_costs ix86_size_cost = >> >>> }; >> >>> >> >>> /* Processor costs (relative to an add) */ >> >>> -static const >> >>> +static >> >>> struct processor_costs i386_cost = { /* 386 specific costs */ >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1), /* cost of a lea instruction */ >> >>> @@ -226,7 +226,7 @@ struct processor_costs i386_cost = { /* >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs i486_cost = { /* 486 specific costs */ >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1), /* cost of a lea instruction */ >> >>> @@ -298,7 +298,7 @@ struct processor_costs i486_cost = { /* >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs pentium_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1), /* cost of a lea instruction */ >> >>> @@ -368,7 +368,7 @@ struct processor_costs pentium_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs pentiumpro_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1), /* cost of a lea instruction */ >> >>> @@ -447,7 +447,7 @@ struct processor_costs pentiumpro_cost = >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs geode_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1), /* cost of a lea instruction */ >> >>> @@ -518,7 +518,7 @@ struct processor_costs geode_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs k6_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (2), /* cost of a lea instruction */ >> >>> @@ -591,7 +591,7 @@ struct processor_costs k6_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs athlon_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (2), /* cost of a lea instruction */ >> >>> @@ -664,7 +664,7 @@ struct processor_costs athlon_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs k8_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (2), /* cost of a lea instruction */ >> >>> @@ -1265,7 +1265,7 @@ struct processor_costs btver2_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs pentium4_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (3), /* cost of a lea instruction */ >> >>> @@ -1336,7 +1336,7 @@ struct processor_costs pentium4_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs nocona_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1), /* cost of a lea instruction */ >> >>> @@ -1409,7 +1409,7 @@ struct processor_costs nocona_cost = { >> >>> 1, /* cond_not_taken_branch_cost. */ >> >>> }; >> >>> >> >>> -static const >> >>> +static >> >>> struct processor_costs atom_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1) + 1, /* cost of a lea instruction */ >> >>> @@ -1556,7 +1556,7 @@ struct processor_costs slm_cost = { >> >>> }; >> >>> >> >>> /* Generic64 should produce code tuned for Nocona and K8. */ >> >>> -static const >> >>> +static >> >>> struct processor_costs generic64_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> /* On all chips taken into consideration lea is 2 cycles and more. With >> >>> @@ -1635,7 +1635,7 @@ struct processor_costs generic64_cost = >> >>> }; >> >>> >> >>> /* core_cost should produce code tuned for Core familly of CPUs. */ >> >>> -static const >> >>> +static >> >>> struct processor_costs core_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> /* On all chips taken into consideration lea is 2 cycles and more. With >> >>> @@ -1717,7 +1717,7 @@ struct processor_costs core_cost = { >> >>> >> >>> /* Generic32 should produce code tuned for PPro, Pentium4, Nocona, >> >>> Athlon and K8. */ >> >>> -static const >> >>> +static >> >>> struct processor_costs generic32_cost = { >> >>> COSTS_N_INSNS (1), /* cost of an add instruction */ >> >>> COSTS_N_INSNS (1) + 1, /* cost of a lea instruction */ >> >>> @@ -2900,6 +2900,150 @@ ix86_debug_options (void) >> >>> >> >>> return; >> >>> } >> >>> + >> >>> +static const char *stringop_alg_names[] = { >> >>> +#define DEF_ENUM >> >>> +#define DEF_ALG(alg, name) #name, >> >>> +#include "stringop.def" >> >>> +#undef DEF_ENUM >> >>> +#undef DEF_ALG >> >>> +}; >> >>> + >> >>> +/* Parse parameter string passed to -mmemcpy-strategy= or -mmemset-strategy=. >> >>> + The string is of the following form (or comma separated list of it): >> >>> + >> >>> + strategy_alg:max_size:[align|noalign] >> >>> + >> >>> + where the full size range for the strategy is either [0, max_size] or >> >>> + [min_size, max_size], in which min_size is the max_size + 1 of the >> >>> + preceding range. The last size range must have max_size == -1. >> >>> + >> >>> + Examples: >> >>> + >> >>> + 1. >> >>> + -mmemcpy-strategy=libcall:-1:noalign >> >>> + >> >>> + this is equivalent to (for known size memcpy) -mstringop-strategy=libcall >> >>> + >> >>> + >> >>> + 2. >> >>> + -mmemset-strategy=rep_8byte:16:noalign,vector_loop:2048:align,libcall:-1:noalign >> >>> + >> >>> + This is to tell the compiler to use the following strategy for memset >> >>> + 1) when the expected size is between [1, 16], use rep_8byte strategy; >> >>> + 2) when the size is between [17, 2048], use vector_loop; >> >>> + 3) when the size is > 2048, use libcall. >> >>> + >> >>> +*/ >> >>> + >> >>> +struct stringop_size_range >> >>> +{ >> >>> + int min; >> >>> + int max; >> >>> + stringop_alg alg; >> >>> + bool noalign; >> >>> +}; >> >>> + >> >>> +static void >> >>> +ix86_parse_stringop_strategy_string (char *strategy_str, bool is_memset) >> >>> +{ >> >>> + const struct stringop_algs *default_algs; >> >>> + stringop_size_range input_ranges[MAX_STRINGOP_ALGS]; >> >>> + char *curr_range_str, *next_range_str; >> >>> + int i = 0, n = 0; >> >>> + >> >>> + if (is_memset) >> >>> + default_algs = &ix86_cost->memset[TARGET_64BIT != 0]; >> >>> + else >> >>> + default_algs = &ix86_cost->memcpy[TARGET_64BIT != 0]; >> >>> + >> >>> + curr_range_str = strategy_str; >> >>> + >> >>> + do { >> >>> + >> >>> + int mins, maxs; >> >>> + stringop_alg alg; >> >>> + char alg_name[128]; >> >>> + char align[16]; >> >>> + >> >>> + next_range_str = strchr (curr_range_str, ','); >> >>> + if (next_range_str) >> >>> + *next_range_str++ = '\0'; >> >>> + >> >>> + if (3 != sscanf (curr_range_str, "%[^:]:%d:%s", alg_name, &maxs, align)) >> >>> + { >> >>> + warning (0, "Wrong arg %s to option %s", curr_range_str, >> >>> + is_memset ? "-mmemset_strategy=" : "-mmemcpy_strategy="); >> >>> + return; >> >>> + } >> >>> + >> >>> + if (n > 0 && (maxs < (mins = input_ranges[n - 1].max + 1) && maxs != -1)) >> >>> + { >> >>> + warning (0, "Size ranges of option %s should be increasing", >> >>> + is_memset ? "-mmemset_strategy=" : "-mmemcpy_strategy="); >> >>> + return; >> >>> + } >> >>> + >> >>> + for (i = 0; i < last_alg; i++) >> >>> + { >> >>> + if (!strcmp (alg_name, stringop_alg_names[i])) >> >>> + { >> >>> + alg = (stringop_alg) i; >> >>> + break; >> >>> + } >> >>> + } >> >>> + >> >>> + if (i == last_alg) >> >>> + { >> >>> + warning (0, "Wrong stringop strategy name %s specified for option %s", >> >>> + alg_name, >> >>> + is_memset ? "-mmemset_strategy=" : "-mmemcpy_strategy="); >> >>> + return; >> >>> + } >> >>> + >> >>> + input_ranges[n].min = mins; >> >>> + input_ranges[n].max = maxs; >> >>> + input_ranges[n].alg = alg; >> >>> + if (!strcmp (align, "align")) >> >>> + input_ranges[n].noalign = false; >> >>> + else if (!strcmp (align, "noalign")) >> >>> + input_ranges[n].noalign = true; >> >>> + else >> >>> + { >> >>> + warning (0, "Unknown alignment %s specified for option %s", >> >>> + align, is_memset ? "-mmemset_strategy=" : "-mmemcpy_strategy="); >> >>> + return; >> >>> + } >> >>> + n++; >> >>> + curr_range_str = next_range_str; >> >>> + } while (curr_range_str); >> >>> + >> >>> + if (input_ranges[n - 1].max != -1) >> >>> + { >> >>> + warning (0, "The max value for the last size range should be -1" >> >>> + " for option %s", >> >>> + is_memset ? "-mmemset_strategy=" : "-mmemcpy_strategy="); >> >>> + return; >> >>> + } >> >>> + >> >>> + if (n > MAX_STRINGOP_ALGS) >> >>> + { >> >>> + warning (0, "Too many size ranges specified in option %s", >> >>> + is_memset ? "-mmemset_strategy=" : "-mmemcpy_strategy="); >> >>> + return; >> >>> + } >> >>> + >> >>> + /* Now override the default algs array */ >> >>> + for (i = 0; i < n; i++) >> >>> + { >> >>> + *const_cast<int *>(&default_algs->size[i].max) = input_ranges[i].max; >> >>> + *const_cast<stringop_alg *>(&default_algs->size[i].alg) >> >>> + = input_ranges[i].alg; >> >>> + *const_cast<int *>(&default_algs->size[i].noalign) >> >>> + = input_ranges[i].noalign; >> >>> + } >> >>> +} >> >>> + >> >>> >> >>> /* Override various settings based on options. If MAIN_ARGS_P, the >> >>> options are from the command line, otherwise they are from >> >>> @@ -4021,6 +4165,21 @@ ix86_option_override_internal (bool main >> >>> /* Handle stack protector */ >> >>> if (!global_options_set.x_ix86_stack_protector_guard) >> >>> ix86_stack_protector_guard = TARGET_HAS_BIONIC ? SSP_GLOBAL : SSP_TLS; >> >>> + >> >>> + /* Handle -mmemcpy-strategy= and -mmemset-strategy= */ >> >>> + if (ix86_tune_memcpy_strategy) >> >>> + { >> >>> + char *str = xstrdup (ix86_tune_memcpy_strategy); >> >>> + ix86_parse_stringop_strategy_string (str, false); >> >>> + free (str); >> >>> + } >> >>> + >> >>> + if (ix86_tune_memset_strategy) >> >>> + { >> >>> + char *str = xstrdup (ix86_tune_memset_strategy); >> >>> + ix86_parse_stringop_strategy_string (str, true); >> >>> + free (str); >> >>> + } >> >>> } >> >>> >> >>> /* Implement the TARGET_OPTION_OVERRIDE hook. */ >> >>> @@ -22903,6 +23062,7 @@ ix86_expand_movmem (rtx dst, rtx src, rt >> >>> { >> >>> case libcall: >> >>> case no_stringop: >> >>> + case last_alg: >> >>> gcc_unreachable (); >> >>> case loop_1_byte: >> >>> need_zero_guard = true; >> >>> @@ -23093,6 +23253,7 @@ ix86_expand_movmem (rtx dst, rtx src, rt >> >>> { >> >>> case libcall: >> >>> case no_stringop: >> >>> + case last_alg: >> >>> gcc_unreachable (); >> >>> case loop_1_byte: >> >>> case loop: >> >>> @@ -23304,6 +23465,7 @@ ix86_expand_setmem (rtx dst, rtx count_e >> >>> { >> >>> case libcall: >> >>> case no_stringop: >> >>> + case last_alg: >> >>> gcc_unreachable (); >> >>> case loop: >> >>> need_zero_guard = true; >> >>> @@ -23481,6 +23643,7 @@ ix86_expand_setmem (rtx dst, rtx count_e >> >>> { >> >>> case libcall: >> >>> case no_stringop: >> >>> + case last_alg: >> >>> gcc_unreachable (); >> >>> case loop_1_byte: >> >>> case loop: >> >>> Index: config/i386/i386-opts.h >> >>> =================================================================== >> >>> --- config/i386/i386-opts.h (revision 201458) >> >>> +++ config/i386/i386-opts.h (working copy) >> >>> @@ -28,15 +28,17 @@ see the files COPYING3 and COPYING.RUNTI >> >>> /* Algorithm to expand string function with. */ >> >>> enum stringop_alg >> >>> { >> >>> - no_stringop, >> >>> - libcall, >> >>> - rep_prefix_1_byte, >> >>> - rep_prefix_4_byte, >> >>> - rep_prefix_8_byte, >> >>> - loop_1_byte, >> >>> - loop, >> >>> - unrolled_loop, >> >>> - vector_loop >> >>> +#undef DEF_ENUM >> >>> +#define DEF_ENUM >> >>> + >> >>> +#undef DEF_ALG >> >>> +#define DEF_ALG(alg, name) alg, >> >>> + >> >>> +#include "stringop.def" >> >>> +last_alg >> >>> + >> >>> +#undef DEF_ENUM >> >>> +#undef DEF_ALG >> >>> }; >> >>> >> >>> /* Available call abi. */ >> >>> Index: doc/invoke.texi >> >>> =================================================================== >> >>> --- doc/invoke.texi (revision 201458) >> >>> +++ doc/invoke.texi (working copy) >> >>> @@ -649,6 +649,7 @@ Objective-C and Objective-C++ Dialects}. >> >>> -mbmi2 -mrtm -mlwp -mthreads @gol >> >>> -mno-align-stringops -minline-all-stringops @gol >> >>> -minline-stringops-dynamically -mstringop-strategy=@var{alg} @gol >> >>> +-mmemcpy-strategy=@var{strategy} -mmemset-strategy=@var{strategy} >> >>> -mpush-args -maccumulate-outgoing-args -m128bit-long-double @gol >> >>> -m96bit-long-double -mlong-double-64 -mlong-double-80 @gol >> >>> -mregparm=@var{num} -msseregparm @gol >> >>> @@ -14598,6 +14599,24 @@ Expand into an inline loop. >> >>> Always use a library call. >> >>> @end table >> >>> >> >>> +@item -mmemcpy-strategy=@var{strategy} >> >>> +@opindex mmemcpy-strategy=@var{strategy} >> >>> +Override the internal decision heuristic to decide if @code{__builtin_memcpy} >> >>> +should be inlined and what inline algorithm to use when the expected size >> >>> +of the copy operation is known. @var{strategy} >> >>> +is a comma-separated list of @var{alg}:@var{max_size}:@var{dest_align} triplets. >> >>> +@var{alg} is specified in @option{-mstringop-strategy}, @var{max_size} specifies >> >>> +the max byte size with which inline algorithm @var{alg} is allowed. For the last >> >>> +triplet, the @var{max_size} must be @code{-1}. The @var{max_size} of the triplets >> >>> +in the list must be specified in increasing order. The minimal byte size for >> >>> +@var{alg} is @code{0} for the first triplet and @code{@var{max_size} + 1} of the >> >>> +preceding range. >> >>> + >> >>> +@item -mmemset-strategy=@var{strategy} >> >>> +@opindex mmemset-strategy=@var{strategy} >> >>> +The option is similar to @option{-mmemcpy-strategy=} except that it is to control >> >>> +@code{__builtin_memset} expansion. >> >>> + >> >>> @item -momit-leaf-frame-pointer >> >>> @opindex momit-leaf-frame-pointer >> >>> Don't keep the frame pointer in a register for leaf functions. This >> >>> Index: testsuite/gcc.target/i386/memcpy-strategy-1.c >> >>> =================================================================== >> >>> --- testsuite/gcc.target/i386/memcpy-strategy-1.c (revision 0) >> >>> +++ testsuite/gcc.target/i386/memcpy-strategy-1.c (revision 0) >> >>> @@ -0,0 +1,12 @@ >> >>> +/* { dg-do compile } */ >> >>> +/* { dg-options "-O2 -march=atom -mmemcpy-strategy=vector_loop:-1:align" } */ >> >>> +/* { dg-final { scan-assembler-times "movdqa" 8 { target { ! { ia32 } } } } } */ >> >>> +/* { dg-final { scan-assembler-times "movdqa" 4 { target { ia32 } } } } */ >> >>> + >> >>> +char a[2048]; >> >>> +char b[2048]; >> >>> +void t (void) >> >>> +{ >> >>> + __builtin_memcpy (a, b, 2048); >> >>> +} >> >>> + >> >>> Index: testsuite/gcc.target/i386/memcpy-strategy-2.c >> >>> =================================================================== >> >>> --- testsuite/gcc.target/i386/memcpy-strategy-2.c (revision 0) >> >>> +++ testsuite/gcc.target/i386/memcpy-strategy-2.c (revision 0) >> >>> @@ -0,0 +1,12 @@ >> >>> +/* { dg-do compile } */ >> >>> +/* { dg-options "-O2 -march=atom -mmemcpy-strategy=vector_loop:3000:align,libcall:-1:align" } */ >> >>> +/* { dg-final { scan-assembler-times "movdqa" 8 { target { ! { ia32 } } } } } */ >> >>> +/* { dg-final { scan-assembler-times "movdqa" 4 { target { ia32 } } } } */ >> >>> + >> >>> +char a[2048]; >> >>> +char b[2048]; >> >>> +void t (void) >> >>> +{ >> >>> + __builtin_memcpy (a, b, 2048); >> >>> +} >> >>> + >> >>> Index: testsuite/gcc.target/i386/memset-strategy-1.c >> >>> =================================================================== >> >>> --- testsuite/gcc.target/i386/memset-strategy-1.c (revision 0) >> >>> +++ testsuite/gcc.target/i386/memset-strategy-1.c (revision 0) >> >>> @@ -0,0 +1,10 @@ >> >>> +/* { dg-do compile } */ >> >>> +/* { dg-options "-O2 -march=atom -mmemset-strategy=libcall:-1:align" } */ >> >>> +/* { dg-final { scan-assembler-times "memset" 2 } } */ >> >>> + >> >>> +char a[2048]; >> >>> +void t (void) >> >>> +{ >> >>> + __builtin_memset (a, 1, 2048); >> >>> +} >> >>> + >> >>> Index: testsuite/gcc.target/i386/memcpy-strategy-3.c >> >>> =================================================================== >> >>> --- testsuite/gcc.target/i386/memcpy-strategy-3.c (revision 0) >> >>> +++ testsuite/gcc.target/i386/memcpy-strategy-3.c (revision 0) >> >>> @@ -0,0 +1,11 @@ >> >>> +/* { dg-do compile } */ >> >>> +/* { dg-options "-O2 -march=atom -mmemcpy-strategy=vector_loop:2000:align,libcall:-1:align" } */ >> >>> +/* { dg-final { scan-assembler-times "memcpy" 2 } } */ >> >>> + >> >>> +char a[2048]; >> >>> +char b[2048]; >> >>> +void t (void) >> >>> +{ >> >>> + __builtin_memcpy (a, b, 2048); >> >>> +} >> >>> + >> >> >> >> >> >> -- >> --- >> Best regards, >> Michael V. Zolotukhin, >> Software Engineer >> Intel Corporation.
Attachment:
stringop_inl_option.p.txt
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