Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1 | // Copyright 2009 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
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| 10 | // disclaimer in the documentation and/or other materials provided |
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| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 27 | |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 28 | // Test paths in the code generator where values in specific registers |
| 29 | // get moved around. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 30 | function identity(x) { |
| 31 | return x; |
| 32 | } |
| 33 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 34 | function lookup(w, a) { |
| 35 | // This function tests a code path in the generation of a keyed load IC |
| 36 | // where the key and the value are both in the same register. |
| 37 | a = a; |
| 38 | w[a] = a; |
| 39 | } |
| 40 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 41 | function cover_codegen_paths() { |
| 42 | var x = 1; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 43 | |
| 44 | // This test depends on the fixed order of register allocation. We try to |
| 45 | // get values in specific registers (ia32, x64): |
| 46 | var a; // Register eax, rax. |
| 47 | var b; // Register ebx, rbx. |
| 48 | var c; // Register ecx, rcx. |
| 49 | var d; // Register edx, rdx. |
| 50 | var di; // Register edi, rdi. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 51 | |
| 52 | while (x == 1) { |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 53 | // The call will spill registers and leave x in {eax,rax}. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 54 | x = identity(1); |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 55 | // The add will spill x and reuse {eax,rax} for the result. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 56 | a = x + 1; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 57 | // A fresh register {ebx,rbx} will be allocated for x, then reused for |
| 58 | // the result. |
| 59 | b = x + 1; |
| 60 | // Et cetera. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 61 | c = x + 1; |
| 62 | d = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 63 | di = x + 1; |
| 64 | // Locals are in the corresponding registers here. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 65 | assertEquals(8, c << a); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 66 | |
| 67 | x = identity(1); |
| 68 | a = x + 1; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 69 | b = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 70 | c = x + 1; |
| 71 | d = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 72 | di = x + 1; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 73 | assertEquals(8, a << c); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 74 | |
| 75 | x = identity(1); |
| 76 | a = x + 1; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 77 | b = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 78 | c = x + 1; |
| 79 | d = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 80 | di = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 81 | c = 0; // Free register ecx. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 82 | assertEquals(8, a << d); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 83 | |
| 84 | x = identity(1); |
| 85 | a = x + 1; |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 86 | b = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 87 | c = x + 1; |
| 88 | d = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 89 | di = x + 1; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 90 | b = 0; // Free register ebx. |
Andrei Popescu | 402d937 | 2010-02-26 13:31:12 +0000 | [diff] [blame] | 91 | assertEquals(8, a << d); |
| 92 | |
| 93 | // Test the non-commutative subtraction operation with a smi on the |
| 94 | // left, all available registers on the right, and a non-smi result. |
| 95 | x = identity(-1073741824); // Least (31-bit) smi. |
| 96 | a = x + 1; // Still a smi, the greatest smi negated. |
| 97 | b = x + 1; |
| 98 | c = x + 1; |
| 99 | d = x + 1; |
| 100 | di = x + 1; |
| 101 | // Subtraction should overflow the 31-bit smi range. The result |
| 102 | // (1073741824) is outside the 31-bit smi range so it doesn't hit the |
| 103 | // "unsafe smi" code that spills a register. |
| 104 | assertEquals(1073741824, 1 - a); |
| 105 | |
| 106 | x = identity(-1073741824); |
| 107 | a = x + 1; |
| 108 | b = x + 1; |
| 109 | c = x + 1; |
| 110 | d = x + 1; |
| 111 | di = x + 1; |
| 112 | assertEquals(1073741824, 1 - b); |
| 113 | |
| 114 | x = identity(-1073741824); |
| 115 | a = x + 1; |
| 116 | b = x + 1; |
| 117 | c = x + 1; |
| 118 | d = x + 1; |
| 119 | di = x + 1; |
| 120 | assertEquals(1073741824, 1 - c); |
| 121 | |
| 122 | x = identity(-1073741824); |
| 123 | a = x + 1; |
| 124 | b = x + 1; |
| 125 | c = x + 1; |
| 126 | d = x + 1; |
| 127 | di = x + 1; |
| 128 | assertEquals(1073741824, 1 - d); |
| 129 | |
| 130 | x = identity(-1073741824); |
| 131 | a = x + 1; |
| 132 | b = x + 1; |
| 133 | c = x + 1; |
| 134 | d = x + 1; |
| 135 | di = x + 1; |
| 136 | assertEquals(1073741824, 1 - di); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 137 | |
| 138 | x = 3; |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 139 | var w = { }; |
| 140 | lookup(w, x); |
| 141 | lookup(w, x); |
| 142 | lookup(w, x); |
| 143 | |
| 144 | x = 3; // Terminate while loop. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 145 | } |
| 146 | } |
| 147 | |
| 148 | cover_codegen_paths(); |