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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - 65536 out of the range of constraint 'I'"
href="https://llvm.org/bugs/show_bug.cgi?id=26874">26874</a>
</td>
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<th>Summary</th>
<td>65536 out of the range of constraint 'I'
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yaojun8558363@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I try to compile Android kernel by using clang.
During compiling, clang report an error. The error is about the implementation
of spinlock.
It says: 65536 out of the range of constraint 'I'.
env:
host: x86_64-linux-ubuntu
target: arm64
cross_toolchain: gcc-linaro-aarch64-4.9-2014.08
kernel branch: android-msm-bullhead-3.10-marshmallow-mr1
code produce error:
path:{kernel Dir}/arch/arm64/include/asm/spinlock.h
content:
//TICKET_SHIFT=16
65 static inline int arch_spin_trylock(arch_spinlock_t *lock)
66 {
67 unsigned int tmp;
68 arch_spinlock_t lockval;
69
70 asm volatile(
71 "1: ldaxr %w0, %2\n"
72 " eor %w1, %w0, %w0, ror #16\n"
73 " cbnz %w1, 2f\n"
74 " add %w0, %w0, %3\n"
75 " stxr %w1, %w0, %2\n"
76 " cbnz %w1, 1b\n"
77 "2:"
78 : "=&r" (lockval), "=&r" (tmp), "+Q" (*lock)
79 : "I" (1 << TICKET_SHIFT)
80 : "memory");
81
82 return !tmp;
83 }</pre>
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