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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
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. | |
4 | |
5 #include "vm/locations.h" | |
6 | |
7 #include "vm/intermediate_language.h" | |
8 | |
9 namespace dart { | |
10 | |
11 | |
12 static Register AllocateFreeRegister( | |
13 EmbeddedArray<bool, kNumberOfCpuRegisters>* blocked_registers) { | |
14 for (int regno = 0; regno < kNumberOfCpuRegisters; regno++) { | |
srdjan
2012/05/21 16:05:22
intptr_t
Vyacheslav Egorov (Google)
2012/05/21 19:53:46
Done.
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15 if (!blocked_registers->At(regno)) { | |
Florian Schneider
2012/05/21 18:33:38
(*blocked_registers)[regno] should also work here.
srdjan
2012/05/21 19:49:43
I like the idea of getting rid of const overloaded
Vyacheslav Egorov (Google)
2012/05/21 19:53:46
I'll go with a method, it looks nicer.
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16 blocked_registers->SetAt(regno, true); | |
Florian Schneider
2012/05/21 18:33:38
(*blocked_registers)[regno] = true;
should also w
Vyacheslav Egorov (Google)
2012/05/21 19:53:46
I'll go with a method, it looks nicer.
| |
17 return static_cast<Register>(regno); | |
18 } | |
19 } | |
20 UNREACHABLE(); | |
21 return kNoRegister; | |
22 } | |
23 | |
24 | |
25 void LocationSummary::AllocateRegisters() { | |
26 EmbeddedArray<bool, kNumberOfCpuRegisters> blocked_registers; | |
27 | |
28 // Mark all registers free. | |
29 for (intptr_t i = 0; i < kNumberOfCpuRegisters; i++) { | |
30 blocked_registers[i] = false; | |
31 } | |
32 | |
33 // Mark all fixed registers as used. | |
34 for (intptr_t i = 0; i < count(); i++) { | |
35 Location loc = in(i); | |
36 if (loc.kind() == Location::kRegister) { | |
37 ASSERT(!blocked_registers[loc.AsRegister()]); | |
38 blocked_registers[loc.value()] = true; | |
39 } | |
40 } | |
41 | |
42 // Allocate all unallocated input locations. | |
43 for (intptr_t i = 0; i < count(); i++) { | |
44 Location loc = in(i); | |
45 if (loc.kind() == Location::kUnallocated) { | |
46 ASSERT(UnallocatedLocation::Cast(loc).policy() == | |
47 UnallocatedLocation::kRegister); | |
48 set_in(i, RegisterLocation( | |
49 AllocateFreeRegister(&blocked_registers))); | |
50 } | |
51 } | |
52 | |
53 Location result_location = out(); | |
54 if (result_location.kind() == Location::kUnallocated) { | |
55 switch (UnallocatedLocation::Cast(result_location).policy()) { | |
56 case UnallocatedLocation::kRegister: | |
57 result_location = RegisterLocation( | |
58 AllocateFreeRegister(&blocked_registers)); | |
59 break; | |
60 case UnallocatedLocation::kSameAsFirstInput: | |
61 result_location = in(0); | |
62 break; | |
63 } | |
64 set_out(result_location); | |
65 } | |
66 } | |
67 | |
68 | |
69 } // namespace dart | |
70 | |
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