===================================================================
@@ -7896,9 +7896,10 @@ each of them.
Not all optimizations are controlled directly by a flag. Only
optimizations that have a flag are listed in this section.
-Most optimizations are only enabled if an @option{-O} level is set on
-the command line. Otherwise they are disabled, even if individual
-optimization flags are specified.
+Most optimizations are completely disabled at @option{-O0} or if an
+@option{-O} level is not set on the command line, even if individual
+optimization flags are specified. Similarly, @option{-Og} suppresses
+many optimization passes.
Depending on the target and how GCC was configured, a slightly different
set of optimizations may be enabled at each @option{-O} level than
@@ -7918,9 +7919,14 @@ With @option{-O}, the compiler tries to
time, without performing any optimizations that take a great deal of
compilation time.
+@c Note that in addition to the default_options_table list in opts.c,
+@c several optimization flags default to true but control optimization
+@c passes that are explicitly disabled at -O0.
+
@option{-O} turns on the following optimization flags:
-@gccoptlist{
--fauto-inc-dec @gol
+
+@c Please keep the following list alphabetized.
+@gccoptlist{-fauto-inc-dec @gol
-fbranch-count-reg @gol
-fcombine-stack-adjustments @gol
-fcompare-elim @gol
@@ -7931,11 +7937,11 @@ compilation time.
-fdse @gol
-fforward-propagate @gol
-fguess-branch-probability @gol
--fif-conversion2 @gol
-fif-conversion @gol
+-fif-conversion2 @gol
-finline-functions-called-once @gol
--fipa-pure-const @gol
-fipa-profile @gol
+-fipa-pure-const @gol
-fipa-reference @gol
-fipa-reference-addressable @gol
-fmerge-constants @gol
@@ -7958,11 +7964,11 @@ compilation time.
-ftree-forwprop @gol
-ftree-fre @gol
-ftree-phiprop @gol
+-ftree-pta @gol
-ftree-scev-cprop @gol
-ftree-sink @gol
-ftree-slsr @gol
-ftree-sra @gol
--ftree-pta @gol
-ftree-ter @gol
-funit-at-a-time}
@@ -7975,10 +7981,12 @@ and the performance of the generated cod
@option{-O2} turns on all optimization flags specified by @option{-O}. It
also turns on the following optimization flags:
-@gccoptlist{-fthread-jumps @gol
--falign-functions -falign-jumps @gol
--falign-loops -falign-labels @gol
+
+@c Please keep the following list alphabetized!
+@gccoptlist{-falign-functions -falign-jumps @gol
+-falign-labels -falign-loops @gol
-fcaller-saves @gol
+-fcode-hoisting @gol
-fcrossjumping @gol
-fcse-follow-jumps -fcse-skip-blocks @gol
-fdelete-null-pointer-checks @gol
@@ -7988,11 +7996,8 @@ also turns on the following optimization
-fhoist-adjacent-loads @gol
-finline-small-functions @gol
-findirect-inlining @gol
--fipa-cp @gol
--fipa-bit-cp @gol
--fipa-vrp @gol
--fipa-sra @gol
--fipa-icf @gol
+-fipa-bit-cp -fipa-cp -fipa-icf @gol
+-fipa-ra -fipa-sra -fipa-vrp @gol
-fisolate-erroneous-paths-dereference @gol
-flra-remat @gol
-foptimize-sibling-calls @gol
@@ -8002,16 +8007,15 @@ also turns on the following optimization
-freorder-blocks-algorithm=stc @gol
-freorder-blocks-and-partition -freorder-functions @gol
-frerun-cse-after-loop @gol
--fsched-interblock -fsched-spec @gol
-fschedule-insns -fschedule-insns2 @gol
+-fsched-interblock -fsched-spec @gol
-fstore-merging @gol
-fstrict-aliasing @gol
+-fthread-jumps @gol
-ftree-builtin-call-dce @gol
--ftree-switch-conversion -ftree-tail-merge @gol
--fcode-hoisting @gol
-ftree-pre @gol
--ftree-vrp @gol
--fipa-ra}
+-ftree-switch-conversion -ftree-tail-merge @gol
+-ftree-vrp}
Please note the warning under @option{-fgcse} about
invoking @option{-O2} on programs that use computed gotos.
@@ -8020,21 +8024,23 @@ invoking @option{-O2} on programs that u
@opindex O3
Optimize yet more. @option{-O3} turns on all optimizations specified
by @option{-O2} and also turns on the following optimization flags:
-@gccoptlist{-finline-functions @gol
--funswitch-loops @gol
--fpredictive-commoning @gol
--fgcse-after-reload @gol
--ftree-loop-vectorize @gol
--ftree-loop-distribution @gol
--ftree-loop-distribute-patterns @gol
+
+@c Please keep the following list alphabetized!
+@gccoptlist{-fgcse-after-reload @gol
+-finline-functions @gol
+-fipa-cp-clone
-floop-interchange @gol
-floop-unroll-and-jam @gol
+-fpeel-loops @gol
+-fpredictive-commoning @gol
-fsplit-paths @gol
--ftree-slp-vectorize @gol
--fvect-cost-model @gol
+-ftree-loop-distribute-patterns @gol
+-ftree-loop-distribution @gol
+-ftree-loop-vectorize @gol
-ftree-partial-pre @gol
--fpeel-loops @gol
--fipa-cp-clone}
+-ftree-slp-vectorize @gol
+-funswitch-loops @gol
+-fvect-cost-model}
@item -O0
@opindex O0
@@ -8043,13 +8049,16 @@ results. This is the default.
@item -Os
@opindex Os
-Optimize for size. @option{-Os} enables all @option{-O2} optimizations that
-do not typically increase code size. It also performs further
-optimizations designed to reduce code size.
-
-@option{-Os} disables the following optimization flags:
-@gccoptlist{-falign-functions -falign-jumps -falign-loops @gol
--falign-labels -fprefetch-loop-arrays}
+Optimize for size. @option{-Os} enables all @option{-O2} optimizations
+except those that often increase code size:
+
+@gccoptlist{-falign-functions -falign-jumps @gol
+-falign-labels -falign-loops @gol
+-fprefetch-loop-arrays -freorder-blocks-algorithm=stc}
+
+It also enables @option{-finline-functions}, causes the compiler to tune for
+code size rather than execution speed, and performs further optimizations
+designed to reduce code size.
@item -Ofast
@opindex Ofast
@@ -8062,11 +8071,24 @@ specified, and @option{-fno-protect-pare
@item -Og
@opindex Og
-Optimize debugging experience. @option{-Og} enables optimizations
-that do not interfere with debugging. It should be the optimization
+Optimize debugging experience. @option{-Og} should be the optimization
level of choice for the standard edit-compile-debug cycle, offering
a reasonable level of optimization while maintaining fast compilation
-and a good debugging experience.
+and a good debugging experience. It is a better choice than @option{-O0}
+for producing debuggable code because some compiler passes
+that collect debug information are disabled at @option{-O0}.
+
+Like @option{-O0}, @option{-Og} completely disables a number of
+optimization passes so that individual options controlling them have
+no effect. Otherwise @option{-Og} enables all @option{-O1}
+optimization flags except for those that may interfere with debugging:
+
+@gccoptlist{-fbranch-count-reg -fdelayed-branch @gol
+-fif-conversion -fif-conversion2 @gol
+-finline-functions-called-once @gol
+-fmove-loop-invariants -fssa-phiopt @gol
+-ftree-bit-ccp -ftree-pta -ftree-sra}
+
@end table
If you use multiple @option{-O} options, with or without level numbers,
@@ -8193,7 +8215,8 @@ caller even if they are not marked @code
function is integrated, then the function is not output as assembler code
in its own right.
-Enabled at levels @option{-O1}, @option{-O2}, @option{-O3} and @option{-Os}.
+Enabled at levels @option{-O1}, @option{-O2}, @option{-O3} and @option{-Os},
+but not @option{-Og}.
@item -fearly-inlining
@opindex fearly-inlining
@@ -8321,7 +8344,8 @@ IA-64 and S/390. Note that the @option{
doesn't remove the decrement and branch instructions from the generated
instruction stream introduced by other optimization passes.
-The default is @option{-fbranch-count-reg} at @option{-O1} and higher.
+The default is @option{-fbranch-count-reg} at @option{-O1} and higher,
+except for @option{-Og}.
@item -fno-function-cse
@opindex fno-function-cse
@@ -8489,14 +8513,16 @@ includes use of conditional moves, min,
some tricks doable by standard arithmetics. The use of conditional execution
on chips where it is available is controlled by @option{-fif-conversion2}.
-Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}.
+Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}, but
+not with @option{-Og}.
@item -fif-conversion2
@opindex fif-conversion2
Use conditional execution (where available) to transform conditional jumps into
branch-less equivalents.
-Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}.
+Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}, but
+not with @option{-Og}.
@item -fdeclone-ctor-dtor
@opindex fdeclone-ctor-dtor
@@ -9071,7 +9097,8 @@ enabled by default at @option{-O} and hi
Perform sparse conditional bit constant propagation on trees and propagate
pointer alignment information.
This pass only operates on local scalar variables and is enabled by default
-at @option{-O} and higher. It requires that @option{-ftree-ccp} is enabled.
+at @option{-O1} and higher, except for @option{-Og}.
+It requires that @option{-ftree-ccp} is enabled.
@item -ftree-ccp
@opindex ftree-ccp
@@ -9089,7 +9116,8 @@ enabled by default at @option{-O} and hi
@item -fssa-phiopt
@opindex fssa-phiopt
Perform pattern matching on SSA PHI nodes to optimize conditional
-code. This pass is enabled by default at @option{-O} and higher.
+code. This pass is enabled by default at @option{-O1} and higher,
+except for @option{-Og}.
@item -ftree-switch-conversion
@opindex ftree-switch-conversion
@@ -9311,13 +9339,14 @@ that have support for @option{-pthread}.
@item -ftree-pta
@opindex ftree-pta
Perform function-local points-to analysis on trees. This flag is
-enabled by default at @option{-O} and higher.
+enabled by default at @option{-O1} and higher, except for @option{-Og}.
@item -ftree-sra
@opindex ftree-sra
Perform scalar replacement of aggregates. This pass replaces structure
references with scalars to prevent committing structures to memory too
-early. This flag is enabled by default at @option{-O} and higher.
+early. This flag is enabled by default at @option{-O1} and higher,
+except for @option{-Og}.
@item -fstore-merging
@opindex fstore-merging
@@ -10474,7 +10503,7 @@ Enabled with @option{-O3} and/or @option
@item -fmove-loop-invariants
@opindex fmove-loop-invariants
Enables the loop invariant motion pass in the RTL loop optimizer. Enabled
-at level @option{-O1}
+at level @option{-O1} and higher, except for @option{-Og}.
@item -fsplit-loops
@opindex fsplit-loops
===================================================================
@@ -435,116 +435,127 @@ maybe_default_options (struct gcc_option
lang_mask, handlers, loc, dc);
}
-/* Table of options enabled by default at different levels. */
+/* Table of options enabled by default at different levels.
+ Please keep this list sorted by level and alphabetized within
+ each level; this makes it easier to keep the documentation
+ in sync. */
static const struct default_options default_options_table[] =
{
- /* -O1 optimizations. */
- { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
-#if DELAY_SLOTS
- { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdelayed_branch, NULL, 1 },
-#endif
- { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
+ /* -O1 and -Og optimizations. */
+ { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
- { 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, OPT_fguess_branch_probability, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_reference_addressable, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_freorder_blocks, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fshrink_wrap, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
- { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_bit_ccp, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_coalesce_vars, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
- { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_sra, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_slsr, NULL, 1 },
+ { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
+
+ /* -O1 (and not -Og) optimizations. */
{ 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 },
+#endif
+ { 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_fmove_loop_invariants, NULL, 1 },
- { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_pta, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fssa_phiopt, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+ { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_bit_ccp, NULL, 1 },
+ { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_sra, NULL, 1 },
+ { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_pta, NULL, 1 },
- /* -O2 optimizations. */
- { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
+ /* -O2 and -Os optimizations. */
+ { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fcode_hoisting, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fdevirtualize_speculatively, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fhoist_adjacent_loads, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fipa_bit_cp, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fipa_icf, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fipa_ra, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fipa_vrp, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fisolate_erroneous_paths_dereference, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_flra_remat, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
#ifdef INSN_SCHEDULING
- /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
- { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
#endif
{ OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
- { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_freorder_blocks_algorithm_, NULL,
- REORDER_BLOCKS_ALGORITHM_STC },
- { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fcode_hoisting, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fstore_merging, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fipa_bit_cp, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fipa_vrp, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fdevirtualize_speculatively, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
- { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_loops, NULL, 1 },
- { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_jumps, NULL, 1 },
- { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_labels, NULL, 1 },
- { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_functions, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_tail_merge, NULL, 1 },
+ { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_CHEAP },
+
+ /* -O2 and -Os optimizations. */
+ { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_functions, NULL, 1 },
+ { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_jumps, NULL, 1 },
+ { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_labels, NULL, 1 },
+ { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_loops, NULL, 1 },
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_foptimize_strlen, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fhoist_adjacent_loads, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fipa_icf, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fisolate_erroneous_paths_dereference, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fipa_ra, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_flra_remat, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_fstore_merging, NULL, 1 },
+ { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_freorder_blocks_algorithm_, NULL,
+ REORDER_BLOCKS_ALGORITHM_STC },
+#ifdef INSN_SCHEDULING
+ /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
+ { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
+#endif
- /* -O3 optimizations. */
- { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribution, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_floop_interchange, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_fsplit_paths, NULL, 1 },
+ /* -O3 and -Os optimizations. */
/* Inlining of functions reducing size is a good idea with -Os
regardless of them being declared inline. */
{ OPT_LEVELS_3_PLUS_AND_SIZE, OPT_finline_functions, NULL, 1 },
- { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_finline_functions_called_once, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_fsplit_loops, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_floop_unroll_and_jam, NULL, 1 },
+
+ /* -O3 optimizations. */
{ OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_floop_interchange, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_floop_unroll_and_jam, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_fpeel_loops, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_fsplit_loops, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_fsplit_paths, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribution, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_ftree_loop_vectorize, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_ftree_partial_pre, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_ftree_slp_vectorize, NULL, 1 },
+ { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_DYNAMIC },
- { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_ftree_partial_pre, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_fpeel_loops, NULL, 1 },
/* -Ofast adds optimizations to -O3. */
{ OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },