1 /*
2 * Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24
25 package org.graalvm.compiler.hotspot.sparc;
26
27 import static jdk.vm.ci.code.ValueUtil.asRegister;
28 import static jdk.vm.ci.code.ValueUtil.isRegister;
29 import static jdk.vm.ci.sparc.SPARC.g0;
30 import static jdk.vm.ci.sparc.SPARC.g5;
31 import static jdk.vm.ci.sparc.SPARC.i0;
32 import static jdk.vm.ci.sparc.SPARC.i7;
33 import static jdk.vm.ci.sparc.SPARC.l0;
34 import static jdk.vm.ci.sparc.SPARC.l7;
35 import static jdk.vm.ci.sparc.SPARC.o0;
36 import static jdk.vm.ci.sparc.SPARC.o7;
37 import static jdk.vm.ci.sparc.SPARC.sp;
38 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BPCC;
39 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.isGlobalRegister;
40 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.Annul.NOT_ANNUL;
41 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.BranchPredict.PREDICT_NOT_TAKEN;
42 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.CC.Xcc;
43 import static org.graalvm.compiler.asm.sparc.SPARCAssembler.ConditionFlag.NotEqual;
44 import static org.graalvm.compiler.core.common.GraalOptions.ZapStackOnMethodEntry;
45
46 import java.util.ArrayList;
47 import java.util.HashSet;
48 import java.util.Set;
49 import java.util.concurrent.ConcurrentHashMap;
50
51 import jdk.internal.vm.compiler.collections.EconomicSet;
52 import jdk.internal.vm.compiler.collections.Equivalence;
53 import org.graalvm.compiler.asm.Assembler;
54 import org.graalvm.compiler.asm.Label;
55 import org.graalvm.compiler.asm.sparc.SPARCAddress;
56 import org.graalvm.compiler.asm.sparc.SPARCAssembler;
57 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
58 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler.ScratchRegister;
59 import org.graalvm.compiler.code.CompilationResult;
60 import org.graalvm.compiler.code.DataSection;
61 import org.graalvm.compiler.code.DataSection.Data;
62 import org.graalvm.compiler.core.common.alloc.RegisterAllocationConfig;
63 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
64 import org.graalvm.compiler.core.gen.LIRGenerationProvider;
65 import org.graalvm.compiler.core.sparc.SPARCNodeMatchRules;
66 import org.graalvm.compiler.debug.CounterKey;
67 import org.graalvm.compiler.debug.DebugContext;
68 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
69 import org.graalvm.compiler.hotspot.HotSpotDataBuilder;
70 import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;
71 import org.graalvm.compiler.hotspot.HotSpotHostBackend;
72 import org.graalvm.compiler.hotspot.HotSpotLIRGenerationResult;
73 import org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProvider;
74 import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
75 import org.graalvm.compiler.hotspot.stubs.Stub;
76 import org.graalvm.compiler.lir.InstructionValueConsumer;
77 import org.graalvm.compiler.lir.LIR;
78 import org.graalvm.compiler.lir.LIRInstruction;
79 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
80 import org.graalvm.compiler.lir.asm.CompilationResultBuilderFactory;
81 import org.graalvm.compiler.lir.asm.DataBuilder;
82 import org.graalvm.compiler.lir.asm.FrameContext;
83 import org.graalvm.compiler.lir.framemap.FrameMap;
84 import org.graalvm.compiler.lir.framemap.FrameMapBuilder;
85 import org.graalvm.compiler.lir.gen.LIRGenerationResult;
86 import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
87 import org.graalvm.compiler.lir.sparc.SPARCCall;
88 import org.graalvm.compiler.lir.sparc.SPARCDelayedControlTransfer;
89 import org.graalvm.compiler.lir.sparc.SPARCFrameMap;
90 import org.graalvm.compiler.lir.sparc.SPARCFrameMapBuilder;
91 import org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin;
92 import org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin.SizeEstimate;
93 import org.graalvm.compiler.lir.sparc.SPARCTailDelayedLIRInstruction;
94 import org.graalvm.compiler.nodes.StructuredGraph;
95 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
96 import org.graalvm.compiler.options.OptionValues;
97
98 import jdk.vm.ci.code.CallingConvention;
99 import jdk.vm.ci.code.Register;
100 import jdk.vm.ci.code.RegisterConfig;
101 import jdk.vm.ci.code.StackSlot;
102 import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
103 import jdk.vm.ci.meta.JavaType;
104 import jdk.vm.ci.meta.ResolvedJavaMethod;
105
106 /**
107 * HotSpot SPARC specific backend.
108 */
109 public class SPARCHotSpotBackend extends HotSpotHostBackend implements LIRGenerationProvider {
110
111 private static final SizeEstimateStatistics CONSTANT_ESTIMATED_STATS = new SizeEstimateStatistics("ESTIMATE");
112 private static final SizeEstimateStatistics CONSTANT_ACTUAL_STATS = new SizeEstimateStatistics("ACTUAL");
113
114 public SPARCHotSpotBackend(GraalHotSpotVMConfig config, HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {
115 super(config, runtime, providers);
116 }
117
118 private static class SizeEstimateStatistics {
119 private static final ConcurrentHashMap<String, CounterKey> counters = new ConcurrentHashMap<>();
120 private final String suffix;
121
122 SizeEstimateStatistics(String suffix) {
123 super();
124 this.suffix = suffix;
125 }
126
127 public void add(Class<?> c, int count, DebugContext debug) {
128 String name = SizeEstimateStatistics.class.getSimpleName() + "_" + c.getSimpleName() + "." + suffix;
129 CounterKey m = counters.computeIfAbsent(name, (n) -> DebugContext.counter(n));
130 m.add(debug, count);
131 }
132 }
133
134 @Override
135 protected FrameMapBuilder newFrameMapBuilder(RegisterConfig registerConfig) {
136 RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
137 FrameMap frameMap = new SPARCFrameMap(getCodeCache(), registerConfigNonNull, this);
138 return new SPARCFrameMapBuilder(frameMap, getCodeCache(), registerConfigNonNull);
139 }
140
141 @Override
142 public LIRGeneratorTool newLIRGenerator(LIRGenerationResult lirGenRes) {
143 return new SPARCHotSpotLIRGenerator(getProviders(), getRuntime().getVMConfig(), lirGenRes);
144 }
145
146 @Override
147 public NodeLIRBuilderTool newNodeLIRBuilder(StructuredGraph graph, LIRGeneratorTool lirGen) {
148 return new SPARCHotSpotNodeLIRBuilder(graph, lirGen, new SPARCNodeMatchRules(lirGen));
149 }
150
151 @Override
152 protected void bangStackWithOffset(CompilationResultBuilder crb, int bangOffset) {
153 // Use SPARCAddress to get the final displacement including the stack bias.
154 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
155 SPARCAddress address = new SPARCAddress(sp, -bangOffset);
156 if (SPARCAssembler.isSimm13(address.getDisplacement())) {
157 masm.stx(g0, address);
158 } else {
159 try (ScratchRegister sc = masm.getScratchRegister()) {
160 Register scratch = sc.getRegister();
161 assert isGlobalRegister(scratch) : "Only global (g1-g7) registers are allowed if the frame was not initialized here. Got register " + scratch;
162 masm.setx(address.getDisplacement(), scratch, false);
163 masm.stx(g0, new SPARCAddress(sp, scratch));
164 }
165 }
166 }
167
168 public class HotSpotFrameContext implements FrameContext {
169
170 final boolean isStub;
171
172 HotSpotFrameContext(boolean isStub) {
173 this.isStub = isStub;
174 }
175
176 @Override
177 public boolean hasFrame() {
178 return true;
179 }
180
181 @Override
182 public void enter(CompilationResultBuilder crb) {
183 final int frameSize = crb.frameMap.totalFrameSize();
184 final int stackpointerChange = -frameSize;
185 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
186 if (!isStub) {
187 emitStackOverflowCheck(crb);
188 }
189
190 if (SPARCAssembler.isSimm13(stackpointerChange)) {
191 masm.save(sp, stackpointerChange, sp);
192 } else {
193 try (ScratchRegister sc = masm.getScratchRegister()) {
194 Register scratch = sc.getRegister();
195 assert isGlobalRegister(scratch) : "Only global registers are allowed before save. Got register " + scratch;
196 masm.setx(stackpointerChange, scratch, false);
197 masm.save(sp, scratch, sp);
198 }
199 }
200
201 if (ZapStackOnMethodEntry.getValue(crb.getOptions())) {
202 final int slotSize = 8;
203 for (int i = 0; i < frameSize / slotSize; ++i) {
204 // 0xC1C1C1C1
205 masm.stx(g0, new SPARCAddress(sp, i * slotSize));
206 }
207 }
208 }
209
210 @Override
211 public void leave(CompilationResultBuilder crb) {
212 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
213 masm.restoreWindow();
214 }
215 }
216
217 @Override
218 public CompilationResultBuilder newCompilationResultBuilder(LIRGenerationResult lirGenRes, FrameMap frameMap, CompilationResult compilationResult, CompilationResultBuilderFactory factory) {
219 HotSpotLIRGenerationResult gen = (HotSpotLIRGenerationResult) lirGenRes;
220 LIR lir = gen.getLIR();
221 assert gen.getDeoptimizationRescueSlot() == null || frameMap.frameNeedsAllocating() : "method that can deoptimize must have a frame";
222
223 Stub stub = gen.getStub();
224 Assembler masm = new SPARCMacroAssembler(getTarget());
225 // On SPARC we always use stack frames.
226 HotSpotFrameContext frameContext = new HotSpotFrameContext(stub != null);
227 DataBuilder dataBuilder = new HotSpotDataBuilder(getCodeCache().getTarget());
228 OptionValues options = lir.getOptions();
229 DebugContext debug = lir.getDebug();
230 CompilationResultBuilder crb = factory.createBuilder(getProviders().getCodeCache(), getProviders().getForeignCalls(), frameMap, masm, dataBuilder, frameContext, options, debug,
231 compilationResult, Register.None);
232 crb.setTotalFrameSize(frameMap.totalFrameSize());
233 crb.setMaxInterpreterFrameSize(gen.getMaxInterpreterFrameSize());
234 StackSlot deoptimizationRescueSlot = gen.getDeoptimizationRescueSlot();
235 if (deoptimizationRescueSlot != null && stub == null) {
236 crb.compilationResult.setCustomStackAreaOffset(deoptimizationRescueSlot);
237 }
238
239 if (stub != null) {
240 updateStub(stub, gen, frameMap);
241 }
242 assert registerSizePredictionValidator(crb, debug);
243 return crb;
244 }
245
246 /**
247 * Registers a verifier which checks if the LIRInstructions estimate of constants size is
248 * greater or equal to the actual one.
249 */
250 private static boolean registerSizePredictionValidator(final CompilationResultBuilder crb, DebugContext debug) {
251 /**
252 * Used to hold state between beforeOp and afterOp
253 */
254 class ValidationState {
255 LIRInstruction op;
256 final DebugContext debug;
257 int constantSizeBefore;
258
259 ValidationState(DebugContext debug) {
260 this.debug = debug;
261 }
262
263 public void before(LIRInstruction before) {
264 assert op == null : "LIRInstruction " + op + " no after call received";
265 op = before;
266 constantSizeBefore = calculateDataSectionSize(crb.compilationResult.getDataSection());
267 }
268
269 public void after(LIRInstruction after) {
270 assert after.equals(op) : "Instructions before/after don't match " + op + "/" + after;
271 int constantSizeAfter = calculateDataSectionSize(crb.compilationResult.getDataSection());
272 int actual = constantSizeAfter - constantSizeBefore;
273 if (op instanceof SPARCLIRInstructionMixin) {
274 org.graalvm.compiler.lir.sparc.SPARCLIRInstructionMixin.SizeEstimate size = ((SPARCLIRInstructionMixin) op).estimateSize();
275 assert size != null : "No size prediction available for op: " + op;
276 Class<?> c = op.getClass();
277 CONSTANT_ESTIMATED_STATS.add(c, size.constantSize, debug);
278 CONSTANT_ACTUAL_STATS.add(c, actual, debug);
279 assert size.constantSize >= actual : "Op " + op + " exceeded estimated constant size; predicted: " + size.constantSize + " actual: " + actual;
280 } else {
281 assert actual == 0 : "Op " + op + " emitted to DataSection without any estimate.";
282 }
283 op = null;
284 constantSizeBefore = 0;
285 }
286 }
287 final ValidationState state = new ValidationState(debug);
288 crb.setOpCallback(op -> state.before(op), op -> state.after(op));
289 return true;
290 }
291
292 private static int calculateDataSectionSize(DataSection ds) {
293 int sum = 0;
294 for (Data d : ds) {
295 sum += d.getSize();
296 }
297 return sum;
298 }
299
300 @Override
301 public void emitCode(CompilationResultBuilder crb, LIR lir, ResolvedJavaMethod installedCodeOwner) {
302 SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
303 // TODO: (sa) Fold the two traversals into one
304 stuffDelayedControlTransfers(lir);
305 int constantSize = calculateConstantSize(lir);
306 boolean canUseImmediateConstantLoad = constantSize < (1 << 13);
307 masm.setImmediateConstantLoad(canUseImmediateConstantLoad);
308 FrameMap frameMap = crb.frameMap;
309 RegisterConfig regConfig = frameMap.getRegisterConfig();
310 Label unverifiedStub = installedCodeOwner == null || installedCodeOwner.isStatic() ? null : new Label();
311 for (int i = 0; i < 2; i++) {
312 if (i > 0) {
313 crb.resetForEmittingCode();
314 lir.resetLabels();
315 resetDelayedControlTransfers(lir);
316 }
317
318 // Emit the prefix
319 if (unverifiedStub != null) {
320 crb.recordMark(config.MARKID_UNVERIFIED_ENTRY);
321 // We need to use JavaCall here because we haven't entered the frame yet.
322 CallingConvention cc = regConfig.getCallingConvention(HotSpotCallingConventionType.JavaCall, null, new JavaType[]{getProviders().getMetaAccess().lookupJavaType(Object.class)}, this);
323 Register inlineCacheKlass = g5; // see MacroAssembler::ic_call
324
325 try (ScratchRegister sc = masm.getScratchRegister()) {
326 Register scratch = sc.getRegister();
327 Register receiver = asRegister(cc.getArgument(0));
328 SPARCAddress src = new SPARCAddress(receiver, config.hubOffset);
329
330 masm.ldx(src, scratch);
331 masm.cmp(scratch, inlineCacheKlass);
332 }
333 BPCC.emit(masm, Xcc, NotEqual, NOT_ANNUL, PREDICT_NOT_TAKEN, unverifiedStub);
334 masm.nop(); // delay slot
335 }
336
337 masm.align(config.codeEntryAlignment);
338 crb.recordMark(config.MARKID_OSR_ENTRY);
339 crb.recordMark(config.MARKID_VERIFIED_ENTRY);
340
341 // Emit code for the LIR
342 crb.emit(lir);
343 }
344 profileInstructions(lir, crb);
345
346 HotSpotFrameContext frameContext = (HotSpotFrameContext) crb.frameContext;
347 HotSpotForeignCallsProvider foreignCalls = getProviders().getForeignCalls();
348 if (!frameContext.isStub) {
349 crb.recordMark(config.MARKID_EXCEPTION_HANDLER_ENTRY);
350 SPARCCall.directCall(crb, masm, foreignCalls.lookupForeignCall(EXCEPTION_HANDLER), null, null);
351 crb.recordMark(config.MARKID_DEOPT_HANDLER_ENTRY);
352 SPARCCall.directCall(crb, masm, foreignCalls.lookupForeignCall(DEOPT_BLOB_UNPACK), null, null);
353 } else {
354 // No need to emit the stubs for entries back into the method since
355 // it has no calls that can cause such "return" entries
356 }
357
358 if (unverifiedStub != null) {
359 masm.bind(unverifiedStub);
360 try (ScratchRegister sc = masm.getScratchRegister()) {
361 Register scratch = sc.getRegister();
362 SPARCCall.indirectJmp(crb, masm, scratch, foreignCalls.lookupForeignCall(IC_MISS_HANDLER));
363 }
364 }
365 masm.peephole();
366 }
367
368 private static int calculateConstantSize(LIR lir) {
369 int size = 0;
370 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
371 if (block == null) {
372 continue;
373 }
374 for (LIRInstruction inst : lir.getLIRforBlock(block)) {
375 if (inst instanceof SPARCLIRInstructionMixin) {
376 SizeEstimate pred = ((SPARCLIRInstructionMixin) inst).estimateSize();
377 if (pred != null) {
378 size += pred.constantSize;
379 }
380 }
381 }
382 }
383 return size;
384 }
385
386 private static void resetDelayedControlTransfers(LIR lir) {
387 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {
388 if (block == null) {
389 continue;
390 }
391 for (LIRInstruction inst : lir.getLIRforBlock(block)) {
392 if (inst instanceof SPARCDelayedControlTransfer) {
393 ((SPARCDelayedControlTransfer) inst).resetState();
394 }
395 }
396 }
397 }
398
399 /**
400 * Fix-up over whole LIR.
401 *
402 * @see #stuffDelayedControlTransfers(LIR, AbstractBlockBase)
403 * @param l
404 */
405 private static void stuffDelayedControlTransfers(LIR l) {
406 for (AbstractBlockBase<?> b : l.codeEmittingOrder()) {
407 if (b != null) {
408 stuffDelayedControlTransfers(l, b);
409 }
410 }
411 }
412
413 /**
414 * Tries to put DelayedControlTransfer instructions and DelayableLIRInstructions together. Also
415 * it tries to move the DelayedLIRInstruction to the DelayedControlTransfer instruction, if
416 * possible.
417 */
418 private static void stuffDelayedControlTransfers(LIR l, AbstractBlockBase<?> block) {
419 ArrayList<LIRInstruction> instructions = l.getLIRforBlock(block);
420 if (instructions.size() >= 2) {
421 LIRDependencyAccumulator acc = new LIRDependencyAccumulator();
422 SPARCDelayedControlTransfer delayedTransfer = null;
423 int delayTransferPosition = -1;
424 for (int i = instructions.size() - 1; i >= 0; i--) {
425 LIRInstruction inst = instructions.get(i);
426 boolean adjacent = delayTransferPosition - i == 1;
427 if (!adjacent || inst.destroysCallerSavedRegisters() || leavesRegisterWindow(inst)) {
428 delayedTransfer = null;
429 }
430 if (inst instanceof SPARCDelayedControlTransfer) {
431 delayedTransfer = (SPARCDelayedControlTransfer) inst;
432 acc.start(inst);
433 delayTransferPosition = i;
434 } else if (delayedTransfer != null) {
435 boolean overlap = acc.add(inst);
436 if (!overlap && inst instanceof SPARCTailDelayedLIRInstruction) {
437 // We have found a non overlapping LIR instruction which can be delayed
438 ((SPARCTailDelayedLIRInstruction) inst).setDelayedControlTransfer(delayedTransfer);
439 delayedTransfer = null;
440 }
441 }
442 }
443 }
444 }
445
446 private static boolean leavesRegisterWindow(LIRInstruction inst) {
447 return inst instanceof SPARCLIRInstructionMixin && ((SPARCLIRInstructionMixin) inst).leavesRegisterWindow();
448 }
449
450 /**
451 * Accumulates inputs/outputs/temp/alive in a set along we walk back the LIRInstructions and
452 * detects, if there is any overlap. In this way LIRInstructions can be detected, which can be
453 * moved nearer to the DelayedControlTransfer instruction.
454 */
455 private static class LIRDependencyAccumulator {
456 private final Set<Object> inputs = new HashSet<>(10);
457 private boolean overlap = false;
458
459 private final InstructionValueConsumer valueConsumer = (instruction, value, mode, flags) -> {
460 Object valueObject = value;
461 if (isRegister(value)) { // Canonicalize registers
462 valueObject = asRegister(value);
463 }
464 if (!inputs.add(valueObject)) {
465 overlap = true;
466 }
467 };
468
469 public void start(LIRInstruction initial) {
470 inputs.clear();
471 overlap = false;
472 initial.visitEachInput(valueConsumer);
473 initial.visitEachTemp(valueConsumer);
474 initial.visitEachAlive(valueConsumer);
475 }
476
477 /**
478 * Adds the inputs of lir instruction to the accumulator and returns, true if there was any
479 * overlap of parameters.
480 *
481 * @param inst
482 * @return true if an overlap was found
483 */
484 public boolean add(LIRInstruction inst) {
485 overlap = false;
486 inst.visitEachOutput(valueConsumer);
487 inst.visitEachTemp(valueConsumer);
488 inst.visitEachInput(valueConsumer);
489 inst.visitEachAlive(valueConsumer);
490 return overlap;
491 }
492 }
493
494 @Override
495 public RegisterAllocationConfig newRegisterAllocationConfig(RegisterConfig registerConfig, String[] allocationRestrictedTo) {
496 RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
497 return new SPARCHotSpotRegisterAllocationConfig(registerConfigNonNull, allocationRestrictedTo);
498 }
499
500 @Override
501 public EconomicSet<Register> translateToCallerRegisters(EconomicSet<Register> calleeRegisters) {
502 EconomicSet<Register> callerRegisters = EconomicSet.create(Equivalence.IDENTITY, calleeRegisters.size());
503 for (Register register : calleeRegisters) {
504 if (l0.number <= register.number && register.number <= l7.number) {
505 // do nothing
506 } else if (o0.number <= register.number && register.number <= o7.number) {
507 // do nothing
508 } else if (i0.number <= register.number && register.number <= i7.number) {
509 // translate input to output registers
510 callerRegisters.add(translateInputToOutputRegister(register));
511 } else {
512 callerRegisters.add(register);
513 }
514 }
515 return callerRegisters;
516 }
517
518 private Register translateInputToOutputRegister(Register register) {
519 assert i0.number <= register.number && register.number <= i7.number : "Not an input register " + register;
520 return getTarget().arch.getRegisters().get(o0.number + register.number - i0.number);
521 }
522 }