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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang hangs when compiling a code sample"
href="https://bugs.llvm.org/show_bug.cgi?id=42148">42148</a>
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<th>Summary</th>
<td>clang hangs when compiling a code sample
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>My command line is clang++ -O3, its version is 9.0.0
The code line is as follows:
typedef unsigned __int128 u128_t;
typedef __float128 f128_t;
typedef union
{
f128_t f;
u128_t i;
} union128_t;
int test(volatile f128_t *start_X_ptr, volatile f128_t *start_Y_ptr)
{
for (unsigned iter_count = 1; iter_count <= 2; iter_count++)
{
union128_t read_valX = { .f = *start_X_ptr };
union128_t read_valY = { .f = *start_Y_ptr };
u128_t expected_val = ((iter_count - 1) * read_valY.i);
if (read_valX.i != expected_val)
{
return -1;
}
union128_t write_valX = { .i = (iter_count * (read_valX.i + 1)) };
union128_t write_valY = { .i = (read_valX.i + 1) };
*start_X_ptr = write_valX.f;
*start_Y_ptr = write_valY.f;
}
return 0;
}
clang hangs when it compiles the code. It consumes a lot of CPU time.</pre>
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