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Issue 6347007: ARM: Implement Math.abs in lithium code generator for the integer and (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Don't save registers for positive numbers. Created 9 years, 11 months ago
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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 1 // Copyright 2006-2008 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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59 int JSCallerSavedCode(int n); 59 int JSCallerSavedCode(int n);
60 60
61 61
62 // Callee-saved registers preserved when switching from C to JavaScript 62 // Callee-saved registers preserved when switching from C to JavaScript
63 static const RegList kCalleeSaved = 63 static const RegList kCalleeSaved =
64 1 << 4 | // r4 v1 64 1 << 4 | // r4 v1
65 1 << 5 | // r5 v2 65 1 << 5 | // r5 v2
66 1 << 6 | // r6 v3 66 1 << 6 | // r6 v3
67 1 << 7 | // r7 v4 67 1 << 7 | // r7 v4
68 1 << 8 | // r8 v5 (cp in JavaScript code) 68 1 << 8 | // r8 v5 (cp in JavaScript code)
69 kR9Available 69 kR9Available << 9 | // r9 v6
70 << 9 | // r9 v6
71 1 << 10 | // r10 v7 70 1 << 10 | // r10 v7
72 1 << 11; // r11 v8 (fp in JavaScript code) 71 1 << 11; // r11 v8 (fp in JavaScript code)
73 72
74 static const int kNumCalleeSaved = 7 + kR9Available; 73 static const int kNumCalleeSaved = 7 + kR9Available;
75 74
76 75
77 // Number of registers for which space is reserved in safepoints. Must be a 76 // Number of registers for which space is reserved in safepoints. Must be a
78 // multiple of 8. 77 // multiple of 8.
79 // TODO(regis): Only 8 registers may actually be sufficient. Revisit. 78 // TODO(regis): Only 8 registers may actually be sufficient. Revisit.
80 static const int kNumSafepointRegisters = 16; 79 static const int kNumSafepointRegisters = 16;
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164 163
165 inline Object* JavaScriptFrame::function_slot_object() const { 164 inline Object* JavaScriptFrame::function_slot_object() const {
166 const int offset = JavaScriptFrameConstants::kFunctionOffset; 165 const int offset = JavaScriptFrameConstants::kFunctionOffset;
167 return Memory::Object_at(fp() + offset); 166 return Memory::Object_at(fp() + offset);
168 } 167 }
169 168
170 169
171 } } // namespace v8::internal 170 } } // namespace v8::internal
172 171
173 #endif // V8_ARM_FRAMES_ARM_H_ 172 #endif // V8_ARM_FRAMES_ARM_H_
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