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File _service:tar_scm:0013-i386-Only-enable-small-loop-unrolling-in-backend-PR-.patch of Package gcc
From 96898a9cd8c159625848247bd2f3a09e5c12fcfa Mon Sep 17 00:00:00 2001 From: Hongyu Wang <hongyu.wang@intel.com> Date: Sat, 19 Nov 2022 09:38:00 +0800 Subject: [PATCH 13/22] i386: Only enable small loop unrolling in backend [PR 107692] Followed by the discussion in pr107692, -munroll-only-small-loops Does not turns on/off -funroll-loops, and current check in pass_rtl_unroll_loops::gate would cause -fno-unroll-loops do not take effect. Revert the change about targetm.loop_unroll_adjust and apply the backend option change to strictly follow the rule that -funroll-loops takes full control of loop unrolling, and munroll-only-small-loops just change its behavior to unroll small size loops. gcc/ChangeLog: PR target/107692 * common/config/i386/i386-common.cc (ix86_optimization_table): Enable loop unroll O2, disable -fweb and -frename-registers by default. * config/i386/i386-options.cc (ix86_override_options_after_change): Disable small loop unroll when funroll-loops enabled, reset cunroll_grow_size when it is not explicitly enabled. (ix86_option_override_internal): Call ix86_override_options_after_change instead of calling ix86_recompute_optlev_based_flags and ix86_default_align separately. * config/i386/i386.cc (ix86_loop_unroll_adjust): Adjust unroll factor if -munroll-only-small-loops enabled. * loop-init.cc (pass_rtl_unroll_loops::gate): Do not enable loop unrolling for -O2-speed. (pass_rtl_unroll_loops::execute): Rmove targetm.loop_unroll_adjust check. gcc/testsuite/ChangeLog: PR target/107692 * gcc.dg/guality/loop-1.c: Remove additional option for ia32. * gcc.target/i386/pr86270.c: Add -fno-unroll-loops. * gcc.target/i386/pr93002.c: Likewise. --- gcc/common/config/i386/i386-common.cc | 8 ++++++ gcc/config/i386/i386-options.cc | 34 ++++++++++++++++++++++--- gcc/config/i386/i386.cc | 18 ++++--------- gcc/loop-init.cc | 10 +++----- gcc/testsuite/gcc.dg/guality/loop-1.c | 2 -- gcc/testsuite/gcc.target/i386/pr86270.c | 2 +- gcc/testsuite/gcc.target/i386/pr93002.c | 2 +- 7 files changed, 48 insertions(+), 28 deletions(-) diff --git a/gcc/common/config/i386/i386-common.cc b/gcc/common/config/i386/i386-common.cc index cdd5caa55..f650e255f 100644 --- a/gcc/common/config/i386/i386-common.cc +++ b/gcc/common/config/i386/i386-common.cc @@ -1687,7 +1687,15 @@ static const struct default_options ix86_option_optimization_table[] = /* The STC algorithm produces the smallest code at -Os, for x86. */ { OPT_LEVELS_2_PLUS, OPT_freorder_blocks_algorithm_, NULL, REORDER_BLOCKS_ALGORITHM_STC }, + + /* Turn on -funroll-loops with -munroll-only-small-loops to enable small + loop unrolling at -O2. */ + { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_funroll_loops, NULL, 1 }, { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_munroll_only_small_loops, NULL, 1 }, + /* Turns off -frename-registers and -fweb which are enabled by + funroll-loops. */ + { OPT_LEVELS_ALL, OPT_frename_registers, NULL, 0 }, + { OPT_LEVELS_ALL, OPT_fweb, NULL, 0 }, /* Turn off -fschedule-insns by default. It tends to make the problem with not enough registers even worse. */ { OPT_LEVELS_ALL, OPT_fschedule_insns, NULL, 0 }, diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc index 099cec4b6..ff44ad4e0 100644 --- a/gcc/config/i386/i386-options.cc +++ b/gcc/config/i386/i386-options.cc @@ -1816,8 +1816,37 @@ ix86_recompute_optlev_based_flags (struct gcc_options *opts, void ix86_override_options_after_change (void) { + /* Default align_* from the processor table. */ ix86_default_align (&global_options); + ix86_recompute_optlev_based_flags (&global_options, &global_options_set); + + /* Disable unrolling small loops when there's explicit + -f{,no}unroll-loop. */ + if ((OPTION_SET_P (flag_unroll_loops)) + || (OPTION_SET_P (flag_unroll_all_loops) + && flag_unroll_all_loops)) + { + if (!OPTION_SET_P (ix86_unroll_only_small_loops)) + ix86_unroll_only_small_loops = 0; + /* Re-enable -frename-registers and -fweb if funroll-loops + enabled. */ + if (!OPTION_SET_P (flag_web)) + flag_web = flag_unroll_loops; + if (!OPTION_SET_P (flag_rename_registers)) + flag_rename_registers = flag_unroll_loops; + /* -fcunroll-grow-size default follws -f[no]-unroll-loops. */ + if (!OPTION_SET_P (flag_cunroll_grow_size)) + flag_cunroll_grow_size = flag_unroll_loops + || flag_peel_loops + || optimize >= 3; + } + else + { + if (!OPTION_SET_P (flag_cunroll_grow_size)) + flag_cunroll_grow_size = flag_peel_loops || optimize >= 3; + } + } /* Clear stack slot assignments remembered from previous functions. @@ -2329,7 +2358,7 @@ ix86_option_override_internal (bool main_args_p, set_ix86_tune_features (opts, ix86_tune, opts->x_ix86_dump_tunes); - ix86_recompute_optlev_based_flags (opts, opts_set); + ix86_override_options_after_change (); ix86_tune_cost = processor_cost_table[ix86_tune]; /* TODO: ix86_cost should be chosen at instruction or function granuality @@ -2360,9 +2389,6 @@ ix86_option_override_internal (bool main_args_p, || TARGET_64BIT_P (opts->x_ix86_isa_flags)) opts->x_ix86_regparm = REGPARM_MAX; - /* Default align_* from the processor table. */ - ix86_default_align (opts); - /* Provide default for -mbranch-cost= value. */ SET_OPTION_IF_UNSET (opts, opts_set, ix86_branch_cost, ix86_tune_cost->branch_cost); diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc index e56004300..462dce10e 100644 --- a/gcc/config/i386/i386.cc +++ b/gcc/config/i386/i386.cc @@ -23572,20 +23572,12 @@ ix86_loop_unroll_adjust (unsigned nunroll, class loop *loop) /* Unroll small size loop when unroll factor is not explicitly specified. */ - if (!(flag_unroll_loops - || flag_unroll_all_loops - || loop->unroll)) + if (ix86_unroll_only_small_loops && !loop->unroll) { - nunroll = 1; - - /* Any explicit -f{no-}unroll-{all-}loops turns off - -munroll-only-small-loops. */ - if (ix86_unroll_only_small_loops - && !OPTION_SET_P (flag_unroll_loops) - && loop->ninsns <= ix86_cost->small_unroll_ninsns) - nunroll = ix86_cost->small_unroll_factor; - - return nunroll; + if (loop->ninsns <= ix86_cost->small_unroll_ninsns) + return MIN (nunroll, ix86_cost->small_unroll_factor); + else + return 1; } if (!TARGET_ADJUST_UNROLL) diff --git a/gcc/loop-init.cc b/gcc/loop-init.cc index f1c717041..1e4f6cfd7 100644 --- a/gcc/loop-init.cc +++ b/gcc/loop-init.cc @@ -565,12 +565,9 @@ public: {} /* opt_pass methods: */ - virtual bool gate (function *fun) + virtual bool gate (function *) { - return (flag_unroll_loops || flag_unroll_all_loops || cfun->has_unroll - || (targetm.loop_unroll_adjust - && optimize >= 2 - && optimize_function_for_speed_p (fun))); + return (flag_unroll_loops || flag_unroll_all_loops || cfun->has_unroll); } virtual unsigned int execute (function *); @@ -586,8 +583,7 @@ pass_rtl_unroll_loops::execute (function *fun) if (dump_file) df_dump (dump_file); - if (flag_unroll_loops - || targetm.loop_unroll_adjust) + if (flag_unroll_loops) flags |= UAP_UNROLL; if (flag_unroll_all_loops) flags |= UAP_UNROLL_ALL; diff --git a/gcc/testsuite/gcc.dg/guality/loop-1.c b/gcc/testsuite/gcc.dg/guality/loop-1.c index a32ea445a..1b1f6d322 100644 --- a/gcc/testsuite/gcc.dg/guality/loop-1.c +++ b/gcc/testsuite/gcc.dg/guality/loop-1.c @@ -1,7 +1,5 @@ /* { dg-do run } */ /* { dg-options "-fno-tree-scev-cprop -fno-tree-vectorize -g" } */ -/* { dg-additional-options "-mno-unroll-only-small-loops" { target ia32 } } */ - #include "../nop.h" diff --git a/gcc/testsuite/gcc.target/i386/pr86270.c b/gcc/testsuite/gcc.target/i386/pr86270.c index cbc9fbb04..98b012caf 100644 --- a/gcc/testsuite/gcc.target/i386/pr86270.c +++ b/gcc/testsuite/gcc.target/i386/pr86270.c @@ -1,5 +1,5 @@ /* { dg-do compile } */ -/* { dg-options "-O2 -mno-unroll-only-small-loops" } */ +/* { dg-options "-O2 -fno-unroll-loops" } */ int *a; long len; diff --git a/gcc/testsuite/gcc.target/i386/pr93002.c b/gcc/testsuite/gcc.target/i386/pr93002.c index f75a847f7..7e2d869e1 100644 --- a/gcc/testsuite/gcc.target/i386/pr93002.c +++ b/gcc/testsuite/gcc.target/i386/pr93002.c @@ -1,6 +1,6 @@ /* PR target/93002 */ /* { dg-do compile } */ -/* { dg-options "-O2 -mno-unroll-only-small-loops" } */ +/* { dg-options "-O2 -fno-unroll-loops" } */ /* { dg-final { scan-assembler-not "cmp\[^\n\r]*-1" } } */ volatile int sink; -- 2.33.0
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