; Machine description for AArch64 architecture.
; Copyright (C) 2009-2016 Free Software Foundation, Inc.
; Contributed by ARM Ltd.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 3, or (at your option)
; any later version.
;
; GCC is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING3.  If not see
; <http://www.gnu.org/licenses/>.

HeaderInclude
config/aarch64/aarch64-opts.h

TargetVariable
enum aarch64_processor explicit_tune_core = aarch64_none

TargetVariable
enum aarch64_arch explicit_arch = aarch64_no_arch

TargetSave
const char *x_aarch64_override_tune_string

TargetVariable
unsigned long aarch64_isa_flags = 0

; The TLS dialect names to use with -mtls-dialect.

Enum
Name(tls_type) Type(enum aarch64_tls_type)
The possible TLS dialects:

EnumValue
Enum(tls_type) String(trad) Value(TLS_TRADITIONAL)

EnumValue
Enum(tls_type) String(desc) Value(TLS_DESCRIPTORS)

; The code model option names for -mcmodel.

Enum
Name(cmodel) Type(enum aarch64_code_model)
The code model option names for -mcmodel:

EnumValue
Enum(cmodel) String(tiny) Value(AARCH64_CMODEL_TINY)

EnumValue
Enum(cmodel) String(small) Value(AARCH64_CMODEL_SMALL)

EnumValue
Enum(cmodel) String(large) Value(AARCH64_CMODEL_LARGE)

mbig-endian
Target Report RejectNegative Mask(BIG_END)
Assume target CPU is configured as big endian.

mgeneral-regs-only
Target Report RejectNegative Mask(GENERAL_REGS_ONLY) Save
Generate code which uses only the general registers.

mfix-cortex-a53-835769
Target Report Var(aarch64_fix_a53_err835769) Init(2) Save
Workaround for ARM Cortex-A53 Erratum number 835769.

mfix-cortex-a53-843419
Target Report Var(aarch64_fix_a53_err843419) Init(2) Save
Workaround for ARM Cortex-A53 Erratum number 843419.

mlittle-endian
Target Report RejectNegative InverseMask(BIG_END)
Assume target CPU is configured as little endian.

mcmodel=
Target RejectNegative Joined Enum(cmodel) Var(aarch64_cmodel_var) Init(AARCH64_CMODEL_SMALL) Save
Specify the code model.

mstrict-align
Target Report RejectNegative Mask(STRICT_ALIGN) Save
Don't assume that unaligned accesses are handled by the system.

momit-leaf-frame-pointer
Target Report Var(flag_omit_leaf_frame_pointer) Init(2) Save
Omit the frame pointer in leaf functions.

mtls-dialect=
Target RejectNegative Joined Enum(tls_type) Var(aarch64_tls_dialect) Init(TLS_DESCRIPTORS) Save
Specify TLS dialect.

mtls-size=
Target RejectNegative Joined Var(aarch64_tls_size) Enum(aarch64_tls_size)
Specifies bit size of immediate TLS offsets.  Valid values are 12, 24, 32, 48.

Enum
Name(aarch64_tls_size) Type(int)

EnumValue
Enum(aarch64_tls_size) String(12) Value(12)

EnumValue
Enum(aarch64_tls_size) String(24) Value(24)

EnumValue
Enum(aarch64_tls_size) String(32) Value(32)

EnumValue
Enum(aarch64_tls_size) String(48) Value(48)

march=
Target RejectNegative ToLower Joined Var(aarch64_arch_string)
-march=ARCH	Use features of architecture ARCH.

mcpu=
Target RejectNegative ToLower Joined Var(aarch64_cpu_string)
-mcpu=CPU	Use features of and optimize for CPU.

mtune=
Target RejectNegative ToLower Joined Var(aarch64_tune_string)
-mtune=CPU	Optimize for CPU.

mabi=
Target RejectNegative Joined Enum(aarch64_abi) Var(aarch64_abi) Init(AARCH64_ABI_DEFAULT)
-mabi=ABI	Generate code that conforms to the specified ABI.

moverride=
Target RejectNegative ToLower Joined Var(aarch64_override_tune_string)
-moverride=STRING	Power users only! Override CPU optimization parameters.

Enum
Name(aarch64_abi) Type(int)
Known AArch64 ABIs (for use with the -mabi= option):

EnumValue
Enum(aarch64_abi) String(ilp32) Value(AARCH64_ABI_ILP32)

EnumValue
Enum(aarch64_abi) String(lp64) Value(AARCH64_ABI_LP64)

mpc-relative-literal-loads
Target Report Save Var(nopcrelative_literal_loads) Init(2) Save
PC relative literal loads.

mlow-precision-recip-sqrt
Common Var(flag_mrecip_low_precision_sqrt) Optimization
When calculating the reciprocal square root approximation,
uses one less step than otherwise, thus reducing latency and precision.