[gcc(refs/users/marxin/heads/PR102688-fix-frename-registers-handling-v2)] Another attempt.

[gcc(refs/users/marxin/heads/PR102688-fix-frename-registers-handling-v2)] Another attempt.

[Martin Liska]

https://gcc.gnu.org/g:0accd6e17ff525994bdbb1c504777f75109f4159

commit 0accd6e17ff525994bdbb1c504777f75109f4159
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Oct 12 16:05:49 2021 +0200

    Another attempt.

Diff:
---
 gcc/common.opt | 6 +++---
 gcc/opts.c     | 5 -----
 gcc/toplev.c   | 7 -------
 3 files changed, 3 insertions(+), 15 deletions(-)

diff --git a/gcc/common.opt b/gcc/common.opt
index 4099effcc80..bcbf95aada3 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2399,7 +2399,7 @@ Common Var(flag_live_range_shrinkage) Init(0) Optimization
 Relief of register pressure through live range shrinkage.
 
 frename-registers
-Common Var(flag_rename_registers) Optimization
+Common Var(flag_rename_registers) Optimization EnabledBy(funroll-loops)
 Perform a register renaming optimization pass.
 
 fschedule-fusion
@@ -2939,7 +2939,7 @@ Common Var(flag_unroll_loops) Optimization
 Perform loop unrolling when iteration count is known.
 
 funroll-all-loops
-Common Var(flag_unroll_all_loops) Optimization
+Common Var(flag_unroll_all_loops) Optimization EnabledBy(funroll-all-loops)
 Perform loop unrolling for all loops.
 
 funroll-completely-grow-size
@@ -3158,7 +3158,7 @@ Common Var(flag_value_profile_transformations) Optimization
 Use expression value profiles in optimizations.
 
 fweb
-Common Var(flag_web) Optimization
+Common Var(flag_web) Optimization EnabledBy(funroll-loops)
 Construct webs and split unrelated uses of single variable.
 
 ftree-builtin-call-dce
diff --git a/gcc/opts.c b/gcc/opts.c
index 2116c2991dd..fc71b6e4242 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -1321,11 +1321,6 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
 				       opts->x_flag_live_patching,
 				       loc);
 
-  /* Unrolling all loops implies that standard loop unrolling must also
-     be done.  */
-  if (opts->x_flag_unroll_all_loops)
-    opts->x_flag_unroll_loops = 1;
-
   /* Allow cunroll to grow size accordingly.  */
   if (!opts_set->x_flag_cunroll_grow_size)
     opts->x_flag_cunroll_grow_size
diff --git a/gcc/toplev.c b/gcc/toplev.c
index 167feac2583..81546b19e91 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1331,13 +1331,6 @@ process_options (bool no_backend)
       flag_abi_version = 2;
     }
 
-  /* web and rename-registers help when run after loop unrolling.  */
-  if (!OPTION_SET_P (flag_web))
-    flag_web = flag_unroll_loops;
-
-  if (!OPTION_SET_P (flag_rename_registers))
-    flag_rename_registers = flag_unroll_loops;
-
   if (flag_non_call_exceptions)
     flag_asynchronous_unwind_tables = 1;
   if (flag_asynchronous_unwind_tables)