Follow-up Comment #4, bug #19029 (project freeciv):
>From n1256:
6.5.7 Bitwise shift operators
Syntax
shift-expression:
additive-expression
shift-expression << additive-expression
shift-expression >> additive-expression
Constraints
Each of the operands shall have integer type.
Semantics
The integer promotions are performed on each of the operands. The type of the
result is
that of the promoted left operand. If the value of the right operand is
negative or is
greater than or equal to the width of the promoted left operand, the behavior
is undefined.
So we have undefined behaviour.
sparc64 output of your program:
0: 1, 1
1: 2, 2
2: 4, 4
3: 8, 8
4: 16, 16
5: 32, 32
6: 64, 64
7: 128, 128
8: 256, 256
9: 512, 512
10: 1024, 1024
11: 2048, 2048
12: 4096, 4096
13: 8192, 8192
14: 16384, 16384
15: 32768, 32768
16: 65536, 65536
17: 131072, 131072
18: 262144, 262144
19: 524288, 524288
20: 1048576, 1048576
21: 2097152, 2097152
22: 4194304, 4194304
23: 8388608, 8388608
24: 16777216, 16777216
25: 33554432, 33554432
26: 67108864, 67108864
27: 134217728, 134217728
28: 268435456, 268435456
29: 536870912, 536870912
30: 1073741824, 1073741824
31: -2147483648, 2147483648
32: 16777216, 16777216
33: 33554432, 33554432
34: 67108864, 67108864
35: 134217728, 134217728
36: 268435456, 268435456
37: 536870912, 536870912
38: 1073741824, 1073741824
39: -2147483648, 2147483648
40: 1, 1
41: 2, 2
42: 4, 4
43: 8, 8
44: 16, 16
45: 32, 32
46: 64, 64
47: 128, 128
48: 256, 256
49: 512, 512
50: 1024, 1024
51: 2048, 2048
52: 4096, 4096
53: 8192, 8192
54: 16384, 16384
55: 32768, 32768
56: 65536, 65536
57: 131072, 131072
58: 262144, 262144
59: 524288, 524288
60: 1048576, 1048576
61: 2097152, 2097152
62: 4194304, 4194304
63: 8388608, 8388608
64: 65536, 65536
65: 131072, 131072
66: 262144, 262144
67: 524288, 524288
68: 1048576, 1048576
69: 2097152, 2097152
70: 4194304, 4194304
71: 8388608, 8388608
72: 16777216, 16777216
73: 33554432, 33554432
74: 67108864, 67108864
75: 134217728, 134217728
76: 268435456, 268435456
77: 536870912, 536870912
78: 1073741824, 1073741824
79: -2147483648, 2147483648
80: 1, 1
81: 2, 2
82: 4, 4
83: 8, 8
84: 16, 16
85: 32, 32
86: 64, 64
87: 128, 128
88: 256, 256
89: 512, 512
90: 1024, 1024
91: 2048, 2048
92: 4096, 4096
93: 8192, 8192
94: 16384, 16384
95: 32768, 32768
96: 256, 256
97: 512, 512
98: 1024, 1024
99: 2048, 2048
100: 4096, 4096
101: 8192, 8192
102: 16384, 16384
103: 32768, 32768
104: 65536, 65536
105: 131072, 131072
106: 262144, 262144
107: 524288, 524288
108: 1048576, 1048576
109: 2097152, 2097152
110: 4194304, 4194304
111: 8388608, 8388608
112: 16777216, 16777216
113: 33554432, 33554432
114: 67108864, 67108864
115: 134217728, 134217728
116: 268435456, 268435456
117: 536870912, 536870912
118: 1073741824, 1073741824
119: -2147483648, 2147483648
120: 1, 1
121: 2, 2
122: 4, 4
123: 8, 8
124: 16, 16
125: 32, 32
Seems identical
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