+2017-11-16 Wilco Dijkstra <wdijkstr@arm.com>
+
+ * opts.c (default_options_table): Add OPT_fomit_frame_pointer entry.
+ * common/config/alpha/alpha-common.c (TARGET_OPTION_OPTIMIZATION_TABLE):
+ Remove OPT_fomit_frame_pointer entry.
+ * common/config/arc/arc-common.c: Likewise.
+ * common/config/arm/arm-common.c: Likewise.
+ * common/config/avr/avr-common.c: Likewise.
+ * common/config/c6x/c6x-common.c: Likewise.
+ * common/config/cr16/cr16-common.c: Likewise.
+ * common/config/cris/cris-common.c: Likewise.
+ * common/config/epiphany/epiphany-common.c: Likewise.
+ * common/config/fr30/fr30-common.c: Likewise.
+ * common/config/frv/frv-common.c: Likewise.
+ * common/config/ia64/ia64-common.c: Likewise.
+ * common/config/iq2000/iq2000-common.c: Likewise.
+ * common/config/lm32/lm32-common.c: Likewise.
+ * common/config/m32r/m32r-common.c: Likewise.
+ * common/config/mcore/mcore-common.c: Likewise.
+ * common/config/microblaze/microblaze-common.c: Likewise.
+ * common/config/mips/mips-common.c: Likewise.
+ * common/config/mmix/mmix-common.c: Likewise.
+ * common/config/mn10300/mn10300-common.c: Likewise.
+ * common/config/nios2/nios2-common.c: Likewise.
+ * common/config/pa/pa-common.c: Likewise.
+ * common/config/pdp11/pdp11-common.c: Likewise.
+ * common/config/powerpcspe/powerpcspe-common.c: Likewise.
+ * common/config/riscv/riscv-common.c: Likewise.
+ * common/config/rs6000/rs6000-common.c: Likewise.
+ * common/config/rx/rx-common.c: Likewise.
+ * common/config/s390/s390-common.c: Likewise.
+ * common/config/sh/sh-common.c: Likewise.
+ * common/config/sparc/sparc-common.c: Likewise.
+ * common/config/tilegx/tilegx-common.c: Likewise.
+ * common/config/tilepro/tilepro-common.c: Likewise.
+ * common/config/v850/v850-common.c: Likewise.
+ * common/config/visium/visium-common.c: Likewise.
+ * common/config/xstormy16/xstormy16-common.c: Likewise.
+ * common/config/xtensa/xtensa-common.c: Likewise.
+ * invoke.texi (-fomit-frame-pointer): Update documentation.
+
2017-11-16 Jan Hubicka <hubicka@ucw.cz>
* tree-cfg.c (gimple_find_sub_bbs): Do not compute freq.
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options alpha_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Enable redundant extension instructions removal at -O2 and higher. */
{ OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
static const struct default_options arc_option_optimization_table[] =
{
{ OPT_LEVELS_SIZE, OPT_fsection_anchors, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_ALL, OPT_mRcq, NULL, 1 },
{ OPT_LEVELS_ALL, OPT_mRcw, NULL, 1 },
{ OPT_LEVELS_ALL, OPT_msize_level_, NULL, 1 },
{
/* Enable section anchors by default at -O1 or higher. */
{ OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options avr_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
// The only effect of -fcaller-saves might be that it triggers
// a frame without need when it tries to be smart around calls.
{ OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
/* Implement overriding of the optimization options. */
static const struct default_options c6x_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_frename_registers, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fmodulo_sched, NULL, 1 },
{ OPT_LEVELS_ALL, OPT_freciprocal_math, NULL, 1 },
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options cr16_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE cr16_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
#include "opts.h"
#include "flags.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-
-static const struct default_options cris_option_optimization_table[] =
- {
- { OPT_LEVELS_2_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
/* TARGET_HANDLE_OPTION worker. We just store the values into local
variables here. Checks for correct semantics are in
cris_option_override. */
#define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | CRIS_SUBTARGET_DEFAULT)
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION cris_handle_option
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE cris_option_optimization_table
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options epiphany_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Enable section anchors by default at -O1 or higher. */
{ OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options fr30_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
#undef TARGET_EXCEPT_UNWIND_INFO
#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE fr30_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
#define MASK_DEFAULT_ALLOC_CC 0
#endif
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options frv_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS \
(MASK_DEFAULT_ALLOC_CC \
| MASK_VLIW_BRANCH \
| MASK_MULTI_CE \
| MASK_NESTED_CE)
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE frv_option_optimization_table
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
/* Implement overriding of the optimization options. */
static const struct default_options ia64_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
#ifdef SUBTARGET_OPTIMIZATION_OPTIONS
SUBTARGET_OPTIMIZATION_OPTIONS,
#endif
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options iq2000_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE iq2000_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options lm32_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE lm32_option_optimization_table
-
#undef TARGET_EXCEPT_UNWIND_INFO
#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
#include "opts.h"
#include "flags.h"
-static const struct default_options m32r_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
/* Implement TARGET_HANDLE_OPTION. */
static bool
#define TARGET_DEFAULT_TARGET_FLAGS TARGET_CPU_DEFAULT
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION m32r_handle_option
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE m32r_option_optimization_table
#undef TARGET_EXCEPT_UNWIND_INFO
#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
static const struct default_options mcore_option_optimization_table[] =
{
{ OPT_LEVELS_1_PLUS, OPT_ffunction_cse, NULL, 0 },
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
{ OPT_LEVELS_ALL, OPT_fschedule_insns, NULL, 0 },
{ OPT_LEVELS_ALL, OPT_fschedule_insns2, NULL, 0 },
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options microblaze_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS TARGET_DEFAULT
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE microblaze_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
}
}
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options mips_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE mips_option_optimization_table
-
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS \
(TARGET_DEFAULT \
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* TARGET_OPTION_OPTIMIZATION_TABLE. */
-
-static const struct default_options mmix_option_optimization_table[] =
- {
- { OPT_LEVELS_2_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS TARGET_DEFAULT
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE mmix_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options mn10300_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* The STC algorithm produces the smallest code at -Os. */
{ OPT_LEVELS_2_PLUS, OPT_freorder_blocks_algorithm_, NULL,
REORDER_BLOCKS_ALGORITHM_STC },
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options nios2_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_mfast_sw_div, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
#include "opts.h"
#include "flags.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options pa_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
/* Implement TARGET_HANDLE_OPTION. */
static bool
}
}
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE pa_option_optimization_table
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT | TARGET_CPU_DEFAULT)
#undef TARGET_HANDLE_OPTION
#include "opts.h"
#include "flags.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-
-static const struct default_options pdp11_option_optimization_table[] =
- {
- { OPT_LEVELS_3_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
/* Implement TARGET_HANDLE_OPTION. */
static bool
(MASK_FPU | MASK_45 | TARGET_UNIX_ASM_DEFAULT)
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION pdp11_handle_option
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE pdp11_option_optimization_table
#undef TARGET_OPTION_INIT_STRUCT
#define TARGET_OPTION_INIT_STRUCT pdp11_option_init_struct
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options rs6000_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Enable -fsched-pressure for first pass instruction scheduling. */
{ OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
static const struct default_options riscv_option_optimization_table[] =
{
{ OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options rs6000_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Enable -fsched-pressure for first pass instruction scheduling. */
{ OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
return true;
}
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options rx_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION rx_handle_option
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE rx_option_optimization_table
-
#undef TARGET_EXCEPT_UNWIND_INFO
#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info
static const struct default_options s390_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
-
/* Enable -fsched-pressure by default when optimizing. */
{ OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
/* Set default optimization options. */
static const struct default_options sh_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_SIZE, OPT_mdiv_, SH_DIV_STR_FOR_SIZE, 1 },
{ OPT_LEVELS_0_ONLY, OPT_mdiv_, "", 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options sparc_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Enable redundant extension instructions removal at -O2 and higher. */
{ OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
#include "flags.h"
static const struct default_options tilegx_option_optimization_table[] = {
- {OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1},
/* Scheduling and bundling are super important for our architecture, so
enable them at -O1. */
{OPT_LEVELS_1_PLUS, OPT_fschedule_insns, NULL, 1},
#include "flags.h"
static const struct default_options tilepro_option_optimization_table[] = {
- {OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1},
/* Scheduling and bundling are super important for our architecture, so
enable them at -O1. */
{OPT_LEVELS_1_PLUS, OPT_fschedule_insns, NULL, 1},
static const struct default_options v850_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Note - we no longer enable MASK_EP when optimizing. This is
because of a hardware bug which stops the SLD and SST instructions
from correctly detecting some hazards. If the user is sure that
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Set default optimization options. */
-static const struct default_options visium_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE visium_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
#include "common/common-target.h"
#include "common/common-target-def.h"
-/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
-static const struct default_options xstorym16_option_optimization_table[] =
- {
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
- { OPT_LEVELS_NONE, 0, NULL, 0 }
- };
-
-#undef TARGET_OPTION_OPTIMIZATION_TABLE
-#define TARGET_OPTION_OPTIMIZATION_TABLE xstorym16_option_optimization_table
-
struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
static const struct default_options xtensa_option_optimization_table[] =
{
- { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
/* Reordering blocks for Xtensa is not a good idea unless the
compiler understands the range of conditional branches.
Currently all branch relaxation for Xtensa is handled in the
-fipa-reference @gol
-fmerge-constants @gol
-fmove-loop-invariants @gol
+-fomit-frame-pointer @gol
-freorder-blocks @gol
-fshrink-wrap @gol
-fshrink-wrap-separate @gol
-ftree-ter @gol
-funit-at-a-time}
-@option{-O} also turns on @option{-fomit-frame-pointer} on machines
-where doing so does not interfere with debugging.
-
@item -O2
@opindex O2
Optimize even more. GCC performs nearly all supported optimizations
@item -fomit-frame-pointer
@opindex fomit-frame-pointer
-Don't keep the frame pointer in a register for functions that
-don't need one. This avoids the instructions to save, set up and
-restore frame pointers; it also makes an extra register available
-in many functions. @strong{It also makes debugging impossible on
-some machines.}
-
-On some machines, such as the VAX, this flag has no effect, because
-the standard calling sequence automatically handles the frame pointer
-and nothing is saved by pretending it doesn't exist. The
-machine-description macro @code{FRAME_POINTER_REQUIRED} controls
-whether a target machine supports this flag. @xref{Registers,,Register
-Usage, gccint, GNU Compiler Collection (GCC) Internals}.
-
-The default setting (when not optimizing for
-size) for 32-bit GNU/Linux x86 and 32-bit Darwin x86 targets is
-@option{-fomit-frame-pointer}. You can configure GCC with the
-@option{--enable-frame-pointer} configure option to change the default.
-
-Note that @option{-fno-omit-frame-pointer} doesn't force a new stack
-frame for all functions if it isn't otherwise needed, and hence doesn't
-guarantee a new frame pointer for all functions.
+Omit the frame pointer in functions that don't need one. This avoids the
+instructions to save, set up and restore the frame pointer; on many targets
+it also makes an extra register available.
-Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}.
+On some targets this flag has no effect because the standard calling sequence
+always uses a frame pointer, so it cannot be omitted.
+
+Note that @option{-fno-omit-frame-pointer} doesn't guarantee the frame pointer
+is used in all functions. Several targets always omit the frame pointer in
+leaf functions.
+
+Enabled by default at @option{-O} and higher.
@item -foptimize-sibling-calls
@opindex foptimize-sibling-calls
@opindex momit-leaf-frame-pointer
Don't keep the frame pointer in a register for leaf functions. This
avoids the instructions to save, set up and restore frame pointers and
-makes an extra register available in leaf functions. The option
-@option{-fomit-frame-pointer} removes the frame pointer for all functions,
-which might make debugging harder.
+makes an extra register available in leaf functions.
@item -mspecld-anomaly
@opindex mspecld-anomaly
{ 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 },
/* -O2 optimizations. */
{ OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
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