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Side by Side Diff: runtime/vm/simulator_arm.cc

Issue 609593002: - Remove Isolate::CurrentAddress(). (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 6 years, 2 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #include <setjmp.h> 5 #include <setjmp.h>
6 #include <stdlib.h> 6 #include <stdlib.h>
7 7
8 #include "vm/globals.h" 8 #include "vm/globals.h"
9 #if defined(TARGET_ARCH_ARM) 9 #if defined(TARGET_ARCH_ARM)
10 10
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2837 } 2837 }
2838 } else { 2838 } else {
2839 UnimplementedInstruction(instr); 2839 UnimplementedInstruction(instr);
2840 } 2840 }
2841 } 2841 }
2842 2842
2843 2843
2844 static float arm_reciprocal_sqrt_estimate(float a) { 2844 static float arm_reciprocal_sqrt_estimate(float a) {
2845 // From the ARM Architecture Reference Manual A2-87. 2845 // From the ARM Architecture Reference Manual A2-87.
2846 if (isinf(a) || (fabs(a) >= exp2f(126))) return 0.0; 2846 if (isinf(a) || (fabs(a) >= exp2f(126))) return 0.0;
2847 else if (a == 0.0) return INFINITY; 2847 else if (a == 0.0) return kPosInfinity;
2848 else if (isnan(a)) return a; 2848 else if (isnan(a)) return a;
2849 2849
2850 uint32_t a_bits = bit_cast<uint32_t, float>(a); 2850 uint32_t a_bits = bit_cast<uint32_t, float>(a);
2851 uint64_t scaled; 2851 uint64_t scaled;
2852 if (((a_bits >> 23) & 1) != 0) { 2852 if (((a_bits >> 23) & 1) != 0) {
2853 // scaled = '0 01111111101' : operand<22:0> : Zeros(29) 2853 // scaled = '0 01111111101' : operand<22:0> : Zeros(29)
2854 scaled = (static_cast<uint64_t>(0x3fd) << 52) | 2854 scaled = (static_cast<uint64_t>(0x3fd) << 52) |
2855 ((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29); 2855 ((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29);
2856 } else { 2856 } else {
2857 // scaled = '0 01111111110' : operand<22:0> : Zeros(29) 2857 // scaled = '0 01111111110' : operand<22:0> : Zeros(29)
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2888 // result = 0 : result_exp<7:0> : estimate<51:29> 2888 // result = 0 : result_exp<7:0> : estimate<51:29>
2889 int32_t result_bits = ((result_exp & 0xff) << 23) | 2889 int32_t result_bits = ((result_exp & 0xff) << 23) |
2890 ((bit_cast<uint64_t, double>(estimate) >> 29) & 0x7fffff); 2890 ((bit_cast<uint64_t, double>(estimate) >> 29) & 0x7fffff);
2891 return bit_cast<float, int32_t>(result_bits); 2891 return bit_cast<float, int32_t>(result_bits);
2892 } 2892 }
2893 2893
2894 2894
2895 static float arm_recip_estimate(float a) { 2895 static float arm_recip_estimate(float a) {
2896 // From the ARM Architecture Reference Manual A2-85. 2896 // From the ARM Architecture Reference Manual A2-85.
2897 if (isinf(a) || (fabs(a) >= exp2f(126))) return 0.0; 2897 if (isinf(a) || (fabs(a) >= exp2f(126))) return 0.0;
2898 else if (a == 0.0) return INFINITY; 2898 else if (a == 0.0) return kPosInfinity;
2899 else if (isnan(a)) return a; 2899 else if (isnan(a)) return a;
2900 2900
2901 uint32_t a_bits = bit_cast<uint32_t, float>(a); 2901 uint32_t a_bits = bit_cast<uint32_t, float>(a);
2902 // scaled = '0011 1111 1110' : a<22:0> : Zeros(29) 2902 // scaled = '0011 1111 1110' : a<22:0> : Zeros(29)
2903 uint64_t scaled = (static_cast<uint64_t>(0x3fe) << 52) | 2903 uint64_t scaled = (static_cast<uint64_t>(0x3fe) << 52) |
2904 ((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29); 2904 ((static_cast<uint64_t>(a_bits) & 0x7fffff) << 29);
2905 // result_exp = 253 - UInt(a<30:23>) 2905 // result_exp = 253 - UInt(a<30:23>)
2906 int32_t result_exp = 253 - ((a_bits >> 23) & 0xff); 2906 int32_t result_exp = 253 - ((a_bits >> 23) & 0xff);
2907 ASSERT((result_exp >= 1) && (result_exp <= 252)); 2907 ASSERT((result_exp >= 1) && (result_exp <= 252));
2908 2908
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3722 set_register(kExceptionObjectReg, bit_cast<int32_t>(raw_exception)); 3722 set_register(kExceptionObjectReg, bit_cast<int32_t>(raw_exception));
3723 set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace)); 3723 set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace));
3724 buf->Longjmp(); 3724 buf->Longjmp();
3725 } 3725 }
3726 3726
3727 } // namespace dart 3727 } // namespace dart
3728 3728
3729 #endif // !defined(HOST_ARCH_ARM) 3729 #endif // !defined(HOST_ARCH_ARM)
3730 3730
3731 #endif // defined TARGET_ARCH_ARM 3731 #endif // defined TARGET_ARCH_ARM
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