|
150
|
1 //===-- llvm/Target/TargetOptions.h - Target Options ------------*- C++ -*-===//
|
|
|
2 //
|
|
|
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
|
4 // See https://llvm.org/LICENSE.txt for license information.
|
|
|
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
6 //
|
|
|
7 //===----------------------------------------------------------------------===//
|
|
|
8 //
|
|
|
9 // This file defines command line option flags that are shared across various
|
|
|
10 // targets.
|
|
|
11 //
|
|
|
12 //===----------------------------------------------------------------------===//
|
|
|
13
|
|
|
14 #ifndef LLVM_TARGET_TARGETOPTIONS_H
|
|
|
15 #define LLVM_TARGET_TARGETOPTIONS_H
|
|
|
16
|
|
|
17 #include "llvm/MC/MCTargetOptions.h"
|
|
|
18
|
|
|
19 namespace llvm {
|
|
|
20 class MachineFunction;
|
|
|
21 class Module;
|
|
|
22
|
|
|
23 namespace FloatABI {
|
|
|
24 enum ABIType {
|
|
|
25 Default, // Target-specific (either soft or hard depending on triple, etc).
|
|
|
26 Soft, // Soft float.
|
|
|
27 Hard // Hard float.
|
|
|
28 };
|
|
|
29 }
|
|
|
30
|
|
|
31 namespace FPOpFusion {
|
|
|
32 enum FPOpFusionMode {
|
|
|
33 Fast, // Enable fusion of FP ops wherever it's profitable.
|
|
|
34 Standard, // Only allow fusion of 'blessed' ops (currently just fmuladd).
|
|
|
35 Strict // Never fuse FP-ops.
|
|
|
36 };
|
|
|
37 }
|
|
|
38
|
|
|
39 namespace JumpTable {
|
|
|
40 enum JumpTableType {
|
|
|
41 Single, // Use a single table for all indirect jumptable calls.
|
|
|
42 Arity, // Use one table per number of function parameters.
|
|
|
43 Simplified, // Use one table per function type, with types projected
|
|
|
44 // into 4 types: pointer to non-function, struct,
|
|
|
45 // primitive, and function pointer.
|
|
|
46 Full // Use one table per unique function type
|
|
|
47 };
|
|
|
48 }
|
|
|
49
|
|
|
50 namespace ThreadModel {
|
|
|
51 enum Model {
|
|
|
52 POSIX, // POSIX Threads
|
|
|
53 Single // Single Threaded Environment
|
|
|
54 };
|
|
|
55 }
|
|
|
56
|
|
|
57 namespace FPDenormal {
|
|
|
58 enum DenormalMode {
|
|
|
59 IEEE, // IEEE 754 denormal numbers
|
|
|
60 PreserveSign, // the sign of a flushed-to-zero number is preserved in
|
|
|
61 // the sign of 0
|
|
|
62 PositiveZero // denormals are flushed to positive zero
|
|
|
63 };
|
|
|
64 }
|
|
|
65
|
|
|
66 enum class EABI {
|
|
|
67 Unknown,
|
|
|
68 Default, // Default means not specified
|
|
|
69 EABI4, // Target-specific (either 4, 5 or gnu depending on triple).
|
|
|
70 EABI5,
|
|
|
71 GNU
|
|
|
72 };
|
|
|
73
|
|
|
74 /// Identify a debugger for "tuning" the debug info.
|
|
|
75 ///
|
|
|
76 /// The "debugger tuning" concept allows us to present a more intuitive
|
|
|
77 /// interface that unpacks into different sets of defaults for the various
|
|
|
78 /// individual feature-flag settings, that suit the preferences of the
|
|
|
79 /// various debuggers. However, it's worth remembering that debuggers are
|
|
|
80 /// not the only consumers of debug info, and some variations in DWARF might
|
|
|
81 /// better be treated as target/platform issues. Fundamentally,
|
|
|
82 /// o if the feature is useful (or not) to a particular debugger, regardless
|
|
|
83 /// of the target, that's a tuning decision;
|
|
|
84 /// o if the feature is useful (or not) on a particular platform, regardless
|
|
|
85 /// of the debugger, that's a target decision.
|
|
|
86 /// It's not impossible to see both factors in some specific case.
|
|
|
87 ///
|
|
|
88 /// The "tuning" should be used to set defaults for individual feature flags
|
|
|
89 /// in DwarfDebug; if a given feature has a more specific command-line option,
|
|
|
90 /// that option should take precedence over the tuning.
|
|
|
91 enum class DebuggerKind {
|
|
|
92 Default, // No specific tuning requested.
|
|
|
93 GDB, // Tune debug info for gdb.
|
|
|
94 LLDB, // Tune debug info for lldb.
|
|
|
95 SCE // Tune debug info for SCE targets (e.g. PS4).
|
|
|
96 };
|
|
|
97
|
|
|
98 /// Enable abort calls when global instruction selection fails to lower/select
|
|
|
99 /// an instruction.
|
|
|
100 enum class GlobalISelAbortMode {
|
|
|
101 Disable, // Disable the abort.
|
|
|
102 Enable, // Enable the abort.
|
|
|
103 DisableWithDiag // Disable the abort but emit a diagnostic on failure.
|
|
|
104 };
|
|
|
105
|
|
|
106 class TargetOptions {
|
|
|
107 public:
|
|
|
108 TargetOptions()
|
|
|
109 : PrintMachineCode(false), UnsafeFPMath(false), NoInfsFPMath(false),
|
|
|
110 NoNaNsFPMath(false), NoTrappingFPMath(true),
|
|
|
111 NoSignedZerosFPMath(false),
|
|
|
112 HonorSignDependentRoundingFPMathOption(false), NoZerosInBSS(false),
|
|
|
113 GuaranteedTailCallOpt(false), StackSymbolOrdering(true),
|
|
|
114 EnableFastISel(false), EnableGlobalISel(false), UseInitArray(false),
|
|
|
115 DisableIntegratedAS(false), RelaxELFRelocations(false),
|
|
|
116 FunctionSections(false), DataSections(false),
|
|
|
117 UniqueSectionNames(true), TrapUnreachable(false),
|
|
|
118 NoTrapAfterNoreturn(false), TLSSize(0), EmulatedTLS(false),
|
|
|
119 ExplicitEmulatedTLS(false), EnableIPRA(false),
|
|
|
120 EmitStackSizeSection(false), EnableMachineOutliner(false),
|
|
|
121 SupportsDefaultOutlining(false), EmitAddrsig(false),
|
|
|
122 EnableDebugEntryValues(false), ForceDwarfFrameSection(false) {}
|
|
|
123
|
|
|
124 /// PrintMachineCode - This flag is enabled when the -print-machineinstrs
|
|
|
125 /// option is specified on the command line, and should enable debugging
|
|
|
126 /// output from the code generator.
|
|
|
127 unsigned PrintMachineCode : 1;
|
|
|
128
|
|
|
129 /// DisableFramePointerElim - This returns true if frame pointer elimination
|
|
|
130 /// optimization should be disabled for the given machine function.
|
|
|
131 bool DisableFramePointerElim(const MachineFunction &MF) const;
|
|
|
132
|
|
|
133 /// UnsafeFPMath - This flag is enabled when the
|
|
|
134 /// -enable-unsafe-fp-math flag is specified on the command line. When
|
|
|
135 /// this flag is off (the default), the code generator is not allowed to
|
|
|
136 /// produce results that are "less precise" than IEEE allows. This includes
|
|
|
137 /// use of X86 instructions like FSIN and FCOS instead of libcalls.
|
|
|
138 unsigned UnsafeFPMath : 1;
|
|
|
139
|
|
|
140 /// NoInfsFPMath - This flag is enabled when the
|
|
|
141 /// -enable-no-infs-fp-math flag is specified on the command line. When
|
|
|
142 /// this flag is off (the default), the code generator is not allowed to
|
|
|
143 /// assume the FP arithmetic arguments and results are never +-Infs.
|
|
|
144 unsigned NoInfsFPMath : 1;
|
|
|
145
|
|
|
146 /// NoNaNsFPMath - This flag is enabled when the
|
|
|
147 /// -enable-no-nans-fp-math flag is specified on the command line. When
|
|
|
148 /// this flag is off (the default), the code generator is not allowed to
|
|
|
149 /// assume the FP arithmetic arguments and results are never NaNs.
|
|
|
150 unsigned NoNaNsFPMath : 1;
|
|
|
151
|
|
|
152 /// NoTrappingFPMath - This flag is enabled when the
|
|
|
153 /// -enable-no-trapping-fp-math is specified on the command line. This
|
|
|
154 /// specifies that there are no trap handlers to handle exceptions.
|
|
|
155 unsigned NoTrappingFPMath : 1;
|
|
|
156
|
|
|
157 /// NoSignedZerosFPMath - This flag is enabled when the
|
|
|
158 /// -enable-no-signed-zeros-fp-math is specified on the command line. This
|
|
|
159 /// specifies that optimizations are allowed to treat the sign of a zero
|
|
|
160 /// argument or result as insignificant.
|
|
|
161 unsigned NoSignedZerosFPMath : 1;
|
|
|
162
|
|
|
163 /// HonorSignDependentRoundingFPMath - This returns true when the
|
|
|
164 /// -enable-sign-dependent-rounding-fp-math is specified. If this returns
|
|
|
165 /// false (the default), the code generator is allowed to assume that the
|
|
|
166 /// rounding behavior is the default (round-to-zero for all floating point
|
|
|
167 /// to integer conversions, and round-to-nearest for all other arithmetic
|
|
|
168 /// truncations). If this is enabled (set to true), the code generator must
|
|
|
169 /// assume that the rounding mode may dynamically change.
|
|
|
170 unsigned HonorSignDependentRoundingFPMathOption : 1;
|
|
|
171 bool HonorSignDependentRoundingFPMath() const;
|
|
|
172
|
|
|
173 /// NoZerosInBSS - By default some codegens place zero-initialized data to
|
|
|
174 /// .bss section. This flag disables such behaviour (necessary, e.g. for
|
|
|
175 /// crt*.o compiling).
|
|
|
176 unsigned NoZerosInBSS : 1;
|
|
|
177
|
|
|
178 /// GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is
|
|
|
179 /// specified on the commandline. When the flag is on, participating targets
|
|
|
180 /// will perform tail call optimization on all calls which use the fastcc
|
|
|
181 /// calling convention and which satisfy certain target-independent
|
|
|
182 /// criteria (being at the end of a function, having the same return type
|
|
|
183 /// as their parent function, etc.), using an alternate ABI if necessary.
|
|
|
184 unsigned GuaranteedTailCallOpt : 1;
|
|
|
185
|
|
|
186 /// StackAlignmentOverride - Override default stack alignment for target.
|
|
|
187 unsigned StackAlignmentOverride = 0;
|
|
|
188
|
|
|
189 /// StackSymbolOrdering - When true, this will allow CodeGen to order
|
|
|
190 /// the local stack symbols (for code size, code locality, or any other
|
|
|
191 /// heuristics). When false, the local symbols are left in whatever order
|
|
|
192 /// they were generated. Default is true.
|
|
|
193 unsigned StackSymbolOrdering : 1;
|
|
|
194
|
|
|
195 /// EnableFastISel - This flag enables fast-path instruction selection
|
|
|
196 /// which trades away generated code quality in favor of reducing
|
|
|
197 /// compile time.
|
|
|
198 unsigned EnableFastISel : 1;
|
|
|
199
|
|
|
200 /// EnableGlobalISel - This flag enables global instruction selection.
|
|
|
201 unsigned EnableGlobalISel : 1;
|
|
|
202
|
|
|
203 /// EnableGlobalISelAbort - Control abort behaviour when global instruction
|
|
|
204 /// selection fails to lower/select an instruction.
|
|
|
205 GlobalISelAbortMode GlobalISelAbort = GlobalISelAbortMode::Enable;
|
|
|
206
|
|
|
207 /// UseInitArray - Use .init_array instead of .ctors for static
|
|
|
208 /// constructors.
|
|
|
209 unsigned UseInitArray : 1;
|
|
|
210
|
|
|
211 /// Disable the integrated assembler.
|
|
|
212 unsigned DisableIntegratedAS : 1;
|
|
|
213
|
|
|
214 /// Compress DWARF debug sections.
|
|
|
215 DebugCompressionType CompressDebugSections = DebugCompressionType::None;
|
|
|
216
|
|
|
217 unsigned RelaxELFRelocations : 1;
|
|
|
218
|
|
|
219 /// Emit functions into separate sections.
|
|
|
220 unsigned FunctionSections : 1;
|
|
|
221
|
|
|
222 /// Emit data into separate sections.
|
|
|
223 unsigned DataSections : 1;
|
|
|
224
|
|
|
225 unsigned UniqueSectionNames : 1;
|
|
|
226
|
|
|
227 /// Emit target-specific trap instruction for 'unreachable' IR instructions.
|
|
|
228 unsigned TrapUnreachable : 1;
|
|
|
229
|
|
|
230 /// Do not emit a trap instruction for 'unreachable' IR instructions behind
|
|
|
231 /// noreturn calls, even if TrapUnreachable is true.
|
|
|
232 unsigned NoTrapAfterNoreturn : 1;
|
|
|
233
|
|
|
234 /// Bit size of immediate TLS offsets (0 == use the default).
|
|
|
235 unsigned TLSSize : 8;
|
|
|
236
|
|
|
237 /// EmulatedTLS - This flag enables emulated TLS model, using emutls
|
|
|
238 /// function in the runtime library..
|
|
|
239 unsigned EmulatedTLS : 1;
|
|
|
240
|
|
|
241 /// Whether -emulated-tls or -no-emulated-tls is set.
|
|
|
242 unsigned ExplicitEmulatedTLS : 1;
|
|
|
243
|
|
|
244 /// This flag enables InterProcedural Register Allocation (IPRA).
|
|
|
245 unsigned EnableIPRA : 1;
|
|
|
246
|
|
|
247 /// Emit section containing metadata on function stack sizes.
|
|
|
248 unsigned EmitStackSizeSection : 1;
|
|
|
249
|
|
|
250 /// Enables the MachineOutliner pass.
|
|
|
251 unsigned EnableMachineOutliner : 1;
|
|
|
252
|
|
|
253 /// Set if the target supports default outlining behaviour.
|
|
|
254 unsigned SupportsDefaultOutlining : 1;
|
|
|
255
|
|
|
256 /// Emit address-significance table.
|
|
|
257 unsigned EmitAddrsig : 1;
|
|
|
258
|
|
|
259 /// Emit debug info about parameter's entry values.
|
|
|
260 unsigned EnableDebugEntryValues : 1;
|
|
|
261
|
|
|
262 /// Emit DWARF debug frame section.
|
|
|
263 unsigned ForceDwarfFrameSection : 1;
|
|
|
264
|
|
|
265 /// FloatABIType - This setting is set by -float-abi=xxx option is specfied
|
|
|
266 /// on the command line. This setting may either be Default, Soft, or Hard.
|
|
|
267 /// Default selects the target's default behavior. Soft selects the ABI for
|
|
|
268 /// software floating point, but does not indicate that FP hardware may not
|
|
|
269 /// be used. Such a combination is unfortunately popular (e.g.
|
|
|
270 /// arm-apple-darwin). Hard presumes that the normal FP ABI is used.
|
|
|
271 FloatABI::ABIType FloatABIType = FloatABI::Default;
|
|
|
272
|
|
|
273 /// AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option.
|
|
|
274 /// This controls the creation of fused FP ops that store intermediate
|
|
|
275 /// results in higher precision than IEEE allows (E.g. FMAs).
|
|
|
276 ///
|
|
|
277 /// Fast mode - allows formation of fused FP ops whenever they're
|
|
|
278 /// profitable.
|
|
|
279 /// Standard mode - allow fusion only for 'blessed' FP ops. At present the
|
|
|
280 /// only blessed op is the fmuladd intrinsic. In the future more blessed ops
|
|
|
281 /// may be added.
|
|
|
282 /// Strict mode - allow fusion only if/when it can be proven that the excess
|
|
|
283 /// precision won't effect the result.
|
|
|
284 ///
|
|
|
285 /// Note: This option only controls formation of fused ops by the
|
|
|
286 /// optimizers. Fused operations that are explicitly specified (e.g. FMA
|
|
|
287 /// via the llvm.fma.* intrinsic) will always be honored, regardless of
|
|
|
288 /// the value of this option.
|
|
|
289 FPOpFusion::FPOpFusionMode AllowFPOpFusion = FPOpFusion::Standard;
|
|
152
|
290 #ifndef noCbC
|
|
|
291 unsigned HasCodeSegment : 1;
|
|
|
292 #endif
|
|
150
|
293
|
|
|
294 /// ThreadModel - This flag specifies the type of threading model to assume
|
|
|
295 /// for things like atomics
|
|
|
296 ThreadModel::Model ThreadModel = ThreadModel::POSIX;
|
|
|
297
|
|
|
298 /// EABIVersion - This flag specifies the EABI version
|
|
|
299 EABI EABIVersion = EABI::Default;
|
|
|
300
|
|
|
301 /// Which debugger to tune for.
|
|
|
302 DebuggerKind DebuggerTuning = DebuggerKind::Default;
|
|
|
303
|
|
|
304 /// FPDenormalMode - This flags specificies which denormal numbers the code
|
|
|
305 /// is permitted to require.
|
|
|
306 FPDenormal::DenormalMode FPDenormalMode = FPDenormal::IEEE;
|
|
|
307
|
|
|
308 /// What exception model to use
|
|
|
309 ExceptionHandling ExceptionModel = ExceptionHandling::None;
|
|
|
310
|
|
|
311 /// Machine level options.
|
|
|
312 MCTargetOptions MCOptions;
|
|
|
313 };
|
|
|
314
|
|
|
315 } // End llvm namespace
|
|
|
316
|
|
|
317 #endif
|
