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Issue 1643973002: MIPS: Refine '[builtins] Make Math.max and Math.min fast by default.' (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Fix comments. Created 4 years, 10 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #if V8_TARGET_ARCH_MIPS 5 #if V8_TARGET_ARCH_MIPS
6 6
7 #include "src/codegen.h" 7 #include "src/codegen.h"
8 #include "src/debug/debug.h" 8 #include "src/debug/debug.h"
9 #include "src/deoptimizer.h" 9 #include "src/deoptimizer.h"
10 #include "src/full-codegen/full-codegen.h" 10 #include "src/full-codegen/full-codegen.h"
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159 // +Infinity), with the tagged value in a1 and the double value in f0. 159 // +Infinity), with the tagged value in a1 and the double value in f0.
160 __ LoadRoot(a1, root_index); 160 __ LoadRoot(a1, root_index);
161 __ ldc1(f0, FieldMemOperand(a1, HeapNumber::kValueOffset)); 161 __ ldc1(f0, FieldMemOperand(a1, HeapNumber::kValueOffset));
162 __ mov(a3, a0); 162 __ mov(a3, a0);
163 163
164 Label done_loop, loop; 164 Label done_loop, loop;
165 __ bind(&loop); 165 __ bind(&loop);
166 { 166 {
167 // Check if all parameters done. 167 // Check if all parameters done.
168 __ Subu(a0, a0, Operand(1)); 168 __ Subu(a0, a0, Operand(1));
169 __ Branch(USE_DELAY_SLOT, &done_loop, lt, a0, Operand(zero_reg)); 169 __ Branch(&done_loop, lt, a0, Operand(zero_reg));
170 170
171 // Load the next parameter tagged value into a2. 171 // Load the next parameter tagged value into a2.
172 __ sll(at, a0, kPointerSizeLog2); // In delay slot 172 __ Lsa(at, sp, a0, kPointerSizeLog2);
173 __ Addu(at, at, sp);
174 __ lw(a2, MemOperand(at)); 173 __ lw(a2, MemOperand(at));
175 174
176 // Load the double value of the parameter into f2, maybe converting the 175 // Load the double value of the parameter into f2, maybe converting the
177 // parameter to a number first using the ToNumberStub if necessary. 176 // parameter to a number first using the ToNumberStub if necessary.
178 Label convert, convert_smi, convert_number, done_convert; 177 Label convert, convert_smi, convert_number, done_convert;
179 __ bind(&convert); 178 __ bind(&convert);
180 __ JumpIfSmi(a2, &convert_smi); 179 __ JumpIfSmi(a2, &convert_smi);
181 __ lw(t0, FieldMemOperand(a2, HeapObject::kMapOffset)); 180 __ lw(t0, FieldMemOperand(a2, HeapObject::kMapOffset));
182 __ JumpIfRoot(t0, Heap::kHeapNumberMapRootIndex, &convert_number); 181 __ JumpIfRoot(t0, Heap::kHeapNumberMapRootIndex, &convert_number);
183 { 182 {
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206 } 205 }
207 __ jmp(&convert); 206 __ jmp(&convert);
208 __ bind(&convert_number); 207 __ bind(&convert_number);
209 __ ldc1(f2, FieldMemOperand(a2, HeapNumber::kValueOffset)); 208 __ ldc1(f2, FieldMemOperand(a2, HeapNumber::kValueOffset));
210 __ jmp(&done_convert); 209 __ jmp(&done_convert);
211 __ bind(&convert_smi); 210 __ bind(&convert_smi);
212 __ SmiToDoubleFPURegister(a2, f2, t0); 211 __ SmiToDoubleFPURegister(a2, f2, t0);
213 __ bind(&done_convert); 212 __ bind(&done_convert);
214 213
215 // Perform the actual comparison with the accumulator value on the left hand 214 // Perform the actual comparison with the accumulator value on the left hand
216 // side (d1) and the next parameter value on the right hand side (d2). 215 // side (f0) and the next parameter value on the right hand side (f2).
217 Label compare_equal, compare_nan, compare_swap; 216 Label compare_equal, compare_nan, compare_swap;
218 __ BranchF(&compare_equal, &compare_nan, eq, f0, f2); 217 __ BranchF(&compare_equal, &compare_nan, eq, f0, f2);
219 __ BranchF(&compare_swap, nullptr, cc, f0, f2); 218 __ BranchF(&compare_swap, nullptr, cc, f0, f2);
220 __ Branch(&loop); 219 __ Branch(&loop);
221 220
222 // Left and right hand side are equal, check for -0 vs. +0. 221 // Left and right hand side are equal, check for -0 vs. +0.
223 __ bind(&compare_equal); 222 __ bind(&compare_equal);
224 __ FmoveHigh(t0, reg); 223 __ FmoveHigh(t0, reg);
225 __ Branch(&loop, ne, t0, Operand(0x80000000)); 224 __ Branch(&loop, ne, t0, Operand(0x80000000));
226 225
227 // Result is on the right hand side. 226 // Result is on the right hand side.
228 __ bind(&compare_swap); 227 __ bind(&compare_swap);
229 __ mov_d(f0, f2); 228 __ mov_d(f0, f2);
230 __ mov(a1, a2); 229 __ mov(a1, a2);
231 __ jmp(&loop); 230 __ jmp(&loop);
232 231
233 // At least one side is NaN, which means that the result will be NaN too. 232 // At least one side is NaN, which means that the result will be NaN too.
234 __ bind(&compare_nan); 233 __ bind(&compare_nan);
235 __ LoadRoot(a1, Heap::kNanValueRootIndex); 234 __ LoadRoot(a1, Heap::kNanValueRootIndex);
236 __ ldc1(f0, FieldMemOperand(a1, HeapNumber::kValueOffset)); 235 __ ldc1(f0, FieldMemOperand(a1, HeapNumber::kValueOffset));
237 __ jmp(&loop); 236 __ jmp(&loop);
238 } 237 }
239 238
240 __ bind(&done_loop); 239 __ bind(&done_loop);
241 __ sll(a3, a3, kPointerSizeLog2); 240 __ Lsa(sp, sp, a3, kPointerSizeLog2);
242 __ addu(sp, sp, a3);
243 __ mov(v0, a1); 241 __ mov(v0, a1);
244 __ DropAndRet(1); 242 __ DropAndRet(1);
245 } 243 }
246 244
247 // static 245 // static
248 void Builtins::Generate_NumberConstructor(MacroAssembler* masm) { 246 void Builtins::Generate_NumberConstructor(MacroAssembler* masm) {
249 // ----------- S t a t e ------------- 247 // ----------- S t a t e -------------
250 // -- a0 : number of arguments 248 // -- a0 : number of arguments
251 // -- a1 : constructor function 249 // -- a1 : constructor function
252 // -- ra : return address 250 // -- ra : return address
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2778 } 2776 }
2779 } 2777 }
2780 2778
2781 2779
2782 #undef __ 2780 #undef __
2783 2781
2784 } // namespace internal 2782 } // namespace internal
2785 } // namespace v8 2783 } // namespace v8
2786 2784
2787 #endif // V8_TARGET_ARCH_MIPS 2785 #endif // V8_TARGET_ARCH_MIPS
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