1; Options for the CRIS port of the compiler.
2
3; Copyright (C) 2005-2018 Free Software Foundation, Inc.
4;
5; This file is part of GCC.
6;
7; GCC is free software; you can redistribute it and/or modify it under
8; the terms of the GNU General Public License as published by the Free
9; Software Foundation; either version 3, or (at your option) any later
10; version.
11;
12; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13; WARRANTY; without even the implied warranty of MERCHANTABILITY or
14; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15; for more details.
16;
17; You should have received a copy of the GNU General Public License
18; along with GCC; see the file COPYING3.  If not see
19; <http://www.gnu.org/licenses/>.
20
21; TARGET_MUL_BUG: Whether or not to work around multiplication
22; instruction hardware bug when generating code for models where
23; it may be present.  From the trouble report for Etrax 100 LX:
24; "A multiply operation may cause incorrect cache behavior
25; under some specific circumstances. The problem can occur if
26; the instruction following the multiply instruction causes a
27; cache miss, and multiply operand 1 (source operand) bits
28; [31:27] matches the logical mapping of the mode register
29; address (0xb0....), and bits [9:2] of operand 1 matches the
30; TLB register address (0x258-0x25f).  There is such a mapping
31; in kernel mode or when the MMU is off.  Normally there is no
32; such mapping in user mode, and the problem will therefore
33; probably not occur in Linux user mode programs."
34;
35; We have no sure-fire way to know from within GCC that we're
36; compiling a user program.  For example, -fpic/PIC is used in
37; libgcc which is linked into the kernel.  However, the
38; workaround option -mno-mul-bug can be safely used per-package
39; when compiling programs.  The same goes for general user-only
40; libraries such as glibc, since there's no user-space
41; driver-like program that gets a mapping of I/O registers (all
42; on the same page, including the TLB registers).
43mmul-bug-workaround
44Target Report Mask(MUL_BUG)
45Work around bug in multiplication instruction.
46
47; TARGET_ETRAX4_ADD: Instruction-set additions from Etrax 4 and up.
48; (Just "lz".)
49metrax4
50Target Report Mask(ETRAX4_ADD)
51Compile for ETRAX 4 (CRIS v3).
52
53; See cris_handle_option.
54metrax100
55Target Report RejectNegative
56Compile for ETRAX 100 (CRIS v8).
57
58; See cris_handle_option.
59mno-etrax100
60Target Report RejectNegative Undocumented
61
62mpdebug
63Target Report Mask(PDEBUG)
64Emit verbose debug information in assembly code.
65
66; TARGET_CCINIT: Whether to use condition-codes generated by
67; insns other than the immediately preceding compare/test insn.
68; Used to check for errors in notice_update_cc.
69mcc-init
70Target Report Mask(CCINIT)
71Do not use condition codes from normal instructions.
72
73; TARGET_SIDE_EFFECT_PREFIXES: Whether to use side-effect
74; patterns.  Used to debug the [rx=ry+i] type patterns.
75mside-effects
76Target Report RejectNegative Mask(SIDE_EFFECT_PREFIXES) Undocumented
77
78mno-side-effects
79Target Report RejectNegative InverseMask(SIDE_EFFECT_PREFIXES)
80Do not emit addressing modes with side-effect assignment.
81
82; TARGET_STACK_ALIGN: Whether to *keep* (not force) alignment of
83; stack at 16 (or 32, depending on TARGET_ALIGN_BY_32) bits.
84mstack-align
85Target Report RejectNegative Mask(STACK_ALIGN) Undocumented
86
87mno-stack-align
88Target Report RejectNegative InverseMask(STACK_ALIGN)
89Do not tune stack alignment.
90
91; TARGET_DATA_ALIGN: Whether to do alignment on individual
92; modifiable objects.
93mdata-align
94Target Report RejectNegative Mask(DATA_ALIGN) Undocumented
95
96mno-data-align
97Target Report RejectNegative InverseMask(DATA_ALIGN)
98Do not tune writable data alignment.
99
100; TARGET_CONST_ALIGN: Whether to do alignment on individual
101; non-modifiable objects.
102mconst-align
103Target Report RejectNegative Mask(CONST_ALIGN) Undocumented
104
105mno-const-align
106Target Report RejectNegative InverseMask(CONST_ALIGN)
107Do not tune code and read-only data alignment.
108
109; See cris_handle_option.
110m32-bit
111Target Report RejectNegative Undocumented
112
113; See cris_handle_option.
114m32bit
115Target Report RejectNegative
116Align code and data to 32 bits.
117
118; See cris_handle_option.
119m16-bit
120Target Report RejectNegative Undocumented
121
122; See cris_handle_option.
123m16bit
124Target Report RejectNegative Undocumented
125
126; See cris_handle_option.
127m8-bit
128Target Report RejectNegative Undocumented
129
130; See cris_handle_option.
131m8bit
132Target Report RejectNegative
133Don't align items in code or data.
134
135; TARGET_PROLOGUE_EPILOGUE: Whether or not to omit function
136; prologue and epilogue.
137mprologue-epilogue
138Target Report RejectNegative Mask(PROLOGUE_EPILOGUE) Undocumented
139
140mno-prologue-epilogue
141Target Report RejectNegative InverseMask(PROLOGUE_EPILOGUE)
142Do not emit function prologue or epilogue.
143
144; We have to handle this m-option here since we can't wash it
145; off in both CC1_SPEC and CC1PLUS_SPEC.
146
147mbest-lib-options
148Target Report RejectNegative
149Use the most feature-enabling options allowed by other options.
150
151; FIXME: The following comment relates to gcc before cris.opt.
152; Check if it's still valid:
153; We must call it "override-" since calling it "no-" will cause
154; gcc.c to forget it, if there's a "later" -mbest-lib-options.
155; Kludgy, but needed for some multilibbed files.
156moverride-best-lib-options
157Target Report RejectNegative
158Override -mbest-lib-options.
159
160mcpu=
161Target Report RejectNegative Joined Undocumented Var(cris_cpu_str)
162
163march=
164Target Report RejectNegative Joined Var(cris_cpu_str)
165-march=ARCH	Generate code for the specified chip or CPU version.
166
167mtune=
168Target Report RejectNegative Joined Var(cris_tune_str)
169-mtune=ARCH	Tune alignment for the specified chip or CPU version.
170
171mmax-stackframe=
172Target Report RejectNegative Joined Var(cris_max_stackframe_str)
173-mmax-stackframe=SIZE	Warn when a stackframe is larger than the specified size.
174
175max-stackframe=
176Target Report RejectNegative Joined Undocumented Var(cris_max_stackframe_str)
177
178mtrap-using-break8
179Target Report Var(cris_trap_using_break8) Init(2)
180Emit traps as \"break 8\", default for CRIS v3 and up.  If disabled, calls to abort() are used.
181
182mtrap-unaligned-atomic
183Target Report Var(cris_trap_unaligned_atomic) Init(2)
184Emit checks causing \"break 8\" instructions to execute when applying atomic builtins on misaligned memory.
185
186munaligned-atomic-may-use-library
187Target Report Var(cris_atomics_calling_libfunc) Init(2)
188Handle atomic builtins that may be applied to unaligned data by calling library functions. Overrides -mtrap-unaligned-atomic.
189
190; TARGET_SVINTO: Currently this just affects alignment.  FIXME:
191; Redundant with TARGET_ALIGN_BY_32, or put machine stuff here?
192; This and the others below could just as well be variables and
193; TARGET_* defines in cris.h.
194Mask(SVINTO)
195
196; TARGET_ALIGN_BY_32: Say that all alignment specifications say
197; to prefer 32 rather than 16 bits.
198Mask(ALIGN_BY_32)
199
200; TARGET_AVOID_GOTPLT is referred to in the .c and the .md so we
201; need to allocate the flag and macros here.
202Mask(AVOID_GOTPLT)
203