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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 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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2239 &miss); | 2239 &miss); |
2240 GenerateLoadFunctionFromCell(cell, function, &miss); | 2240 GenerateLoadFunctionFromCell(cell, function, &miss); |
2241 } | 2241 } |
2242 // Load the (only) argument into rax. | 2242 // Load the (only) argument into rax. |
2243 __ movq(rax, Operand(rsp, 1 * kPointerSize)); | 2243 __ movq(rax, Operand(rsp, 1 * kPointerSize)); |
2244 | 2244 |
2245 // Check if the argument is a smi. | 2245 // Check if the argument is a smi. |
2246 Label not_smi; | 2246 Label not_smi; |
2247 STATIC_ASSERT(kSmiTag == 0); | 2247 STATIC_ASSERT(kSmiTag == 0); |
2248 __ JumpIfNotSmi(rax, ¬_smi); | 2248 __ JumpIfNotSmi(rax, ¬_smi); |
2249 __ SmiToInteger32(rax, rax); | |
2250 | 2249 |
| 2250 // Branchless abs implementation, refer to below: |
| 2251 // http://graphics.stanford.edu/~seander/bithacks.html#IntegerAbs |
2251 // Set ebx to 1...1 (== -1) if the argument is negative, or to 0...0 | 2252 // Set ebx to 1...1 (== -1) if the argument is negative, or to 0...0 |
2252 // otherwise. | 2253 // otherwise. |
2253 __ movl(rbx, rax); | 2254 __ movq(rbx, rax); |
2254 __ sarl(rbx, Immediate(kBitsPerInt - 1)); | 2255 __ sar(rbx, Immediate(kBitsPerPointer - 1)); |
2255 | 2256 |
2256 // Do bitwise not or do nothing depending on ebx. | 2257 // Do bitwise not or do nothing depending on ebx. |
2257 __ xorl(rax, rbx); | 2258 __ xor_(rax, rbx); |
2258 | 2259 |
2259 // Add 1 or do nothing depending on ebx. | 2260 // Add 1 or do nothing depending on ebx. |
2260 __ subl(rax, rbx); | 2261 __ subq(rax, rbx); |
2261 | 2262 |
2262 // If the result is still negative, go to the slow case. | 2263 // If the result is still negative, go to the slow case. |
2263 // This only happens for the most negative smi. | 2264 // This only happens for the most negative smi. |
2264 Label slow; | 2265 Label slow; |
2265 __ j(negative, &slow); | 2266 __ j(negative, &slow); |
2266 | 2267 |
2267 // Smi case done. | |
2268 __ Integer32ToSmi(rax, rax); | |
2269 __ ret(2 * kPointerSize); | 2268 __ ret(2 * kPointerSize); |
2270 | 2269 |
2271 // Check if the argument is a heap number and load its value. | 2270 // Check if the argument is a heap number and load its value. |
2272 __ bind(¬_smi); | 2271 __ bind(¬_smi); |
2273 __ CheckMap(rax, factory()->heap_number_map(), &slow, DONT_DO_SMI_CHECK); | 2272 __ CheckMap(rax, factory()->heap_number_map(), &slow, DONT_DO_SMI_CHECK); |
2274 __ movq(rbx, FieldOperand(rax, HeapNumber::kValueOffset)); | 2273 __ movq(rbx, FieldOperand(rax, HeapNumber::kValueOffset)); |
2275 | 2274 |
2276 // Check the sign of the argument. If the argument is positive, | 2275 // Check the sign of the argument. If the argument is positive, |
2277 // just return it. | 2276 // just return it. |
2278 Label negative_sign; | 2277 Label negative_sign; |
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3514 TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow); | 3513 TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow); |
3515 } | 3514 } |
3516 } | 3515 } |
3517 | 3516 |
3518 | 3517 |
3519 #undef __ | 3518 #undef __ |
3520 | 3519 |
3521 } } // namespace v8::internal | 3520 } } // namespace v8::internal |
3522 | 3521 |
3523 #endif // V8_TARGET_ARCH_X64 | 3522 #endif // V8_TARGET_ARCH_X64 |
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