From: Andi Kleen <ak@gcc.gnu.org>
Date: Tue, 15 Oct 2024 20:15:09 +0000 (-0700)
Subject: Disable -fbit-tests and -fjump-tables at -O0
X-Git-Tag: basepoints/gcc-16~4797
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06bc3a734e88908cad1d3bf547a722b3f9597a0d;p=thirdparty%2Fgcc.git

Disable -fbit-tests and -fjump-tables at -O0

gcc/ChangeLog:

	* common.opt: Enable -fbit-tests and -fjump-tables only at -O1.
	* opts.cc (default_options_table): Dito.
---

diff --git a/gcc/common.opt b/gcc/common.opt
index 12b25ff486de..70a22cdc71a4 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2189,11 +2189,11 @@ Common Var(flag_ivopts) Init(1) Optimization
 Optimize induction variables on trees.
 
 fjump-tables
-Common Var(flag_jump_tables) Init(1) Optimization
+Common Var(flag_jump_tables) Init(0) Optimization
 Use jump tables for sufficiently large switch statements.
 
 fbit-tests
-Common Var(flag_bit_tests) Init(1) Optimization
+Common Var(flag_bit_tests) Init(0) Optimization
 Use bit tests for sufficiently large switch statements.
 
 fkeep-inline-functions
diff --git a/gcc/opts.cc b/gcc/opts.cc
index e810e30961b9..5d08e5ab2b54 100644
--- a/gcc/opts.cc
+++ b/gcc/opts.cc
@@ -611,6 +611,7 @@ static const struct default_options default_options_table[] =
     { OPT_LEVELS_1_PLUS, OPT_fvar_tracking, NULL, 1 },
 
     /* -O1 (and not -Og) optimizations.  */
+    { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fbit_tests, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fbranch_count_reg, NULL, 1 },
 #if DELAY_SLOTS
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdelayed_branch, NULL, 1 },
@@ -619,6 +620,7 @@ static const struct default_options default_options_table[] =
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion2, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_finline_functions_called_once, NULL, 1 },
+    { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fjump_tables, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fmove_loop_invariants, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fmove_loop_stores, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fssa_phiopt, NULL, 1 },