i386: Only enable small loop unrolling in backend [PR 107602]

Message ID 20221119062532.75190-1-hongyu.wang@intel.com
State Accepted
Headers
Series i386: Only enable small loop unrolling in backend [PR 107602] |

Checks

Context Check Description
snail/gcc-patch-check success Github commit url

Commit Message

Hongyu Wang Nov. 19, 2022, 6:25 a.m. UTC
  Hi,

Followed by the discussion in pr107602, -munroll-only-small-loops
Does not turns on/off -funroll-loops, and current check in
pass_rtl_unroll_loops::gate would cause -funroll-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.

Bootstrapped and regtested on x86-64-pc-linux-gnu.

Ok for trunk?

gcc/ChangeLog:

	PR target/107602
	* 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/107602
	* 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                        | 11 +++-----
 gcc/testsuite/gcc.target/i386/pr86270.c |  2 +-
 gcc/testsuite/gcc.target/i386/pr93002.c |  2 +-
 6 files changed, 49 insertions(+), 26 deletions(-)
  

Comments

Li, Pan2 via Gcc-patches Nov. 21, 2022, 1:01 a.m. UTC | #1
> -----Original Message-----
> From: Wang, Hongyu <hongyu.wang@intel.com>
> Sent: Saturday, November 19, 2022 2:26 PM
> To: gcc-patches@gcc.gnu.org
> Cc: richard.guenther@gmail.com; ubizjak@gmail.com; Liu, Hongtao
> <hongtao.liu@intel.com>
> Subject: [PATCH] i386: Only enable small loop unrolling in backend [PR 107602]
> 
> Hi,
> 
> Followed by the discussion in pr107602, -munroll-only-small-loops Does not
PR107692?
> turns on/off -funroll-loops, and current check in pass_rtl_unroll_loops::gate
> would cause -funroll-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.
> 
> Bootstrapped and regtested on x86-64-pc-linux-gnu.
> 
> Ok for trunk?
> 
> gcc/ChangeLog:
> 
> 	PR target/107602
> 	* 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/107602
> 	* 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                        | 11 +++-----
>  gcc/testsuite/gcc.target/i386/pr86270.c |  2 +-
> gcc/testsuite/gcc.target/i386/pr93002.c |  2 +-
>  6 files changed, 49 insertions(+), 26 deletions(-)
> 
> diff --git a/gcc/common/config/i386/i386-common.cc
> b/gcc/common/config/i386/i386-common.cc
> index 6ce2a588adc..660a977b68b 100644
> --- a/gcc/common/config/i386/i386-common.cc
> +++ b/gcc/common/config/i386/i386-common.cc
> @@ -1808,7 +1808,15 @@ 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
> e5c77f3a84d..bc1d36e36a8 100644
> --- a/gcc/config/i386/i386-options.cc
> +++ b/gcc/config/i386/i386-options.cc
> @@ -1838,8 +1838,37 @@ 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.
> @@ -2351,7 +2380,7 @@ 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
> @@ -2382,9 +2411,6 @@ 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
> 292b32c5e99..10f8b4e91a5 100644
> --- a/gcc/config/i386/i386.cc
> +++ b/gcc/config/i386/i386.cc
> @@ -23829,20 +23829,12 @@ 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 9789efa1e11..f03c077cae1
> 100644
> --- a/gcc/loop-init.cc
> +++ b/gcc/loop-init.cc
> @@ -565,12 +565,10 @@ public:
>    {}
> 
>    /* opt_pass methods: */
> -  bool gate (function *fun) final override
> +  bool gate (function *) final override
>      {
> -      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);
>      }
> 
>    unsigned int execute (function *) final override; @@ -586,8 +584,7 @@
> 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.target/i386/pr86270.c
> b/gcc/testsuite/gcc.target/i386/pr86270.c
> index cbc9fbb0450..98b012caf23 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 f75a847f75d..7e2d869e17b 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;
> --
> 2.18.1
  
Hongtao Liu Nov. 21, 2022, 1:35 a.m. UTC | #2
On Mon, Nov 21, 2022 at 9:01 AM Liu, Hongtao via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
>
>
> > -----Original Message-----
> > From: Wang, Hongyu <hongyu.wang@intel.com>
> > Sent: Saturday, November 19, 2022 2:26 PM
> > To: gcc-patches@gcc.gnu.org
> > Cc: richard.guenther@gmail.com; ubizjak@gmail.com; Liu, Hongtao
> > <hongtao.liu@intel.com>
> > Subject: [PATCH] i386: Only enable small loop unrolling in backend [PR 107602]
> >
> > Hi,
> >
> > Followed by the discussion in pr107602, -munroll-only-small-loops Does not
> PR107692?
> > turns on/off -funroll-loops, and current check in pass_rtl_unroll_loops::gate
> > would cause -funroll-loops do not take effect. Revert the change about
It's not necessarily right. unroll_factor will be set as 1 when
-fno-unroll-loops, which is exactly -fno-unroll-loops means.
> > 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.
> >
> > Bootstrapped and regtested on x86-64-pc-linux-gnu.
> >
> > Ok for trunk?
> >
> > gcc/ChangeLog:
> >
> >       PR target/107602
> >       * 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/107602
> >       * 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                        | 11 +++-----
> >  gcc/testsuite/gcc.target/i386/pr86270.c |  2 +-
> > gcc/testsuite/gcc.target/i386/pr93002.c |  2 +-
> >  6 files changed, 49 insertions(+), 26 deletions(-)
> >
> > diff --git a/gcc/common/config/i386/i386-common.cc
> > b/gcc/common/config/i386/i386-common.cc
> > index 6ce2a588adc..660a977b68b 100644
> > --- a/gcc/common/config/i386/i386-common.cc
> > +++ b/gcc/common/config/i386/i386-common.cc
> > @@ -1808,7 +1808,15 @@ 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
> > e5c77f3a84d..bc1d36e36a8 100644
> > --- a/gcc/config/i386/i386-options.cc
> > +++ b/gcc/config/i386/i386-options.cc
> > @@ -1838,8 +1838,37 @@ 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.
> > @@ -2351,7 +2380,7 @@ 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
> > @@ -2382,9 +2411,6 @@ 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
> > 292b32c5e99..10f8b4e91a5 100644
> > --- a/gcc/config/i386/i386.cc
> > +++ b/gcc/config/i386/i386.cc
> > @@ -23829,20 +23829,12 @@ 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 9789efa1e11..f03c077cae1
> > 100644
> > --- a/gcc/loop-init.cc
> > +++ b/gcc/loop-init.cc
> > @@ -565,12 +565,10 @@ public:
> >    {}
> >
> >    /* opt_pass methods: */
> > -  bool gate (function *fun) final override
> > +  bool gate (function *) final override
> >      {
> > -      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);
> >      }
> >
> >    unsigned int execute (function *) final override; @@ -586,8 +584,7 @@
> > 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.target/i386/pr86270.c
> > b/gcc/testsuite/gcc.target/i386/pr86270.c
> > index cbc9fbb0450..98b012caf23 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 f75a847f75d..7e2d869e17b 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;
> > --
> > 2.18.1
>
  
Hongyu Wang Nov. 21, 2022, 6:12 a.m. UTC | #3
> It's not necessarily right. unroll_factor will be set as 1 when
> -fno-unroll-loops, which is exactly -fno-unroll-loops means.

Not that exactly, -fno-unroll-loops previously will prevent the pass
from running, and on the current trunk the pass still runs.
Actually I think the implementation on trunk is a bit tricky since we
use a target hook without return value to execute the pass. Also the
logic !OPTION_SET_P looks quite like a workaround. IMHO this is also
not good for maintenance.

Hongtao Liu via Gcc-patches <gcc-patches@gcc.gnu.org> 于2022年11月21日周一 09:33写道:
>
> On Mon, Nov 21, 2022 at 9:01 AM Liu, Hongtao via Gcc-patches
> <gcc-patches@gcc.gnu.org> wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: Wang, Hongyu <hongyu.wang@intel.com>
> > > Sent: Saturday, November 19, 2022 2:26 PM
> > > To: gcc-patches@gcc.gnu.org
> > > Cc: richard.guenther@gmail.com; ubizjak@gmail.com; Liu, Hongtao
> > > <hongtao.liu@intel.com>
> > > Subject: [PATCH] i386: Only enable small loop unrolling in backend [PR 107602]
> > >
> > > Hi,
> > >
> > > Followed by the discussion in pr107602, -munroll-only-small-loops Does not
> > PR107692?
> > > turns on/off -funroll-loops, and current check in pass_rtl_unroll_loops::gate
> > > would cause -funroll-loops do not take effect. Revert the change about
> It's not necessarily right. unroll_factor will be set as 1 when
> -fno-unroll-loops, which is exactly -fno-unroll-loops means.
> > > 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.
> > >
> > > Bootstrapped and regtested on x86-64-pc-linux-gnu.
> > >
> > > Ok for trunk?
> > >
> > > gcc/ChangeLog:
> > >
> > >       PR target/107602
> > >       * 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/107602
> > >       * 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                        | 11 +++-----
> > >  gcc/testsuite/gcc.target/i386/pr86270.c |  2 +-
> > > gcc/testsuite/gcc.target/i386/pr93002.c |  2 +-
> > >  6 files changed, 49 insertions(+), 26 deletions(-)
> > >
> > > diff --git a/gcc/common/config/i386/i386-common.cc
> > > b/gcc/common/config/i386/i386-common.cc
> > > index 6ce2a588adc..660a977b68b 100644
> > > --- a/gcc/common/config/i386/i386-common.cc
> > > +++ b/gcc/common/config/i386/i386-common.cc
> > > @@ -1808,7 +1808,15 @@ 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
> > > e5c77f3a84d..bc1d36e36a8 100644
> > > --- a/gcc/config/i386/i386-options.cc
> > > +++ b/gcc/config/i386/i386-options.cc
> > > @@ -1838,8 +1838,37 @@ 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.
> > > @@ -2351,7 +2380,7 @@ 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
> > > @@ -2382,9 +2411,6 @@ 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
> > > 292b32c5e99..10f8b4e91a5 100644
> > > --- a/gcc/config/i386/i386.cc
> > > +++ b/gcc/config/i386/i386.cc
> > > @@ -23829,20 +23829,12 @@ 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 9789efa1e11..f03c077cae1
> > > 100644
> > > --- a/gcc/loop-init.cc
> > > +++ b/gcc/loop-init.cc
> > > @@ -565,12 +565,10 @@ public:
> > >    {}
> > >
> > >    /* opt_pass methods: */
> > > -  bool gate (function *fun) final override
> > > +  bool gate (function *) final override
> > >      {
> > > -      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);
> > >      }
> > >
> > >    unsigned int execute (function *) final override; @@ -586,8 +584,7 @@
> > > 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.target/i386/pr86270.c
> > > b/gcc/testsuite/gcc.target/i386/pr86270.c
> > > index cbc9fbb0450..98b012caf23 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 f75a847f75d..7e2d869e17b 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;
> > > --
> > > 2.18.1
> >
>
>
> --
> BR,
> Hongtao
  
Jeff Law Nov. 21, 2022, 5:40 p.m. UTC | #4
On 11/18/22 23:25, Hongyu Wang via Gcc-patches wrote:
> Hi,
>
> Followed by the discussion in pr107602, -munroll-only-small-loops
> Does not turns on/off -funroll-loops, and current check in
> pass_rtl_unroll_loops::gate would cause -funroll-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.
>
> Bootstrapped and regtested on x86-64-pc-linux-gnu.
>
> Ok for trunk?
>
> gcc/ChangeLog:
>
> 	PR target/107602
> 	* 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.
The reversion of the loop-init.cc changes is fine.  The x86 maintainers 
will need to chime in on the rest.  Consider installing the loop-init.cc 
reversion immediately as the current state has regressed s390 and 
potentially other targets.


jeff
  
Hongtao Liu Nov. 22, 2022, 1:08 a.m. UTC | #5
On Tue, Nov 22, 2022 at 1:41 AM Jeff Law via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
>
> On 11/18/22 23:25, Hongyu Wang via Gcc-patches wrote:
> > Hi,
> >
> > Followed by the discussion in pr107602, -munroll-only-small-loops
> > Does not turns on/off -funroll-loops, and current check in
> > pass_rtl_unroll_loops::gate would cause -funroll-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.
> >
> > Bootstrapped and regtested on x86-64-pc-linux-gnu.
> >
> > Ok for trunk?
> >
> > gcc/ChangeLog:
> >
> >       PR target/107602
> >       * 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.
> The reversion of the loop-init.cc changes is fine.  The x86 maintainers
> will need to chime in on the rest.  Consider installing the loop-init.cc
> reversion immediately as the current state has regressed s390 and
> potentially other targets.
x86 part is ok.
>
>
> jeff
>
  
Hongyu Wang Nov. 23, 2022, 1:54 a.m. UTC | #6
Hi Jeff,

> The reversion of the loop-init.cc changes is fine.  The x86 maintainers
> will need to chime in on the rest.  Consider installing the loop-init.cc
> reversion immediately as the current state has regressed s390 and
> potentially other targets.

I've posted a patch in
https://gcc.gnu.org/pipermail/gcc-patches/2022-November/606478.html
to change the rs6000 target and there is a discussion ongoing. If we
draw a conclusion that we only want to make changes in the backend, I
will install this one.
  

Patch

diff --git a/gcc/common/config/i386/i386-common.cc b/gcc/common/config/i386/i386-common.cc
index 6ce2a588adc..660a977b68b 100644
--- a/gcc/common/config/i386/i386-common.cc
+++ b/gcc/common/config/i386/i386-common.cc
@@ -1808,7 +1808,15 @@  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 e5c77f3a84d..bc1d36e36a8 100644
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -1838,8 +1838,37 @@  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.
@@ -2351,7 +2380,7 @@  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
@@ -2382,9 +2411,6 @@  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 292b32c5e99..10f8b4e91a5 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -23829,20 +23829,12 @@  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 9789efa1e11..f03c077cae1 100644
--- a/gcc/loop-init.cc
+++ b/gcc/loop-init.cc
@@ -565,12 +565,10 @@  public:
   {}
 
   /* opt_pass methods: */
-  bool gate (function *fun) final override
+  bool gate (function *) final override
     {
-      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);
     }
 
   unsigned int execute (function *) final override;
@@ -586,8 +584,7 @@  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.target/i386/pr86270.c b/gcc/testsuite/gcc.target/i386/pr86270.c
index cbc9fbb0450..98b012caf23 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 f75a847f75d..7e2d869e17b 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;