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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bounds check not eliminated"
href="https://bugs.llvm.org/show_bug.cgi?id=48544">48544</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Bounds check not eliminated
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jmuizelaar@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>#include <stdlib.h>
char foo(char* data, size_t len, size_t i, size_t j) {
if (i < len && j <= i) {
if (j < len) {
return data[j];
} else {
exit(1);
}
} else {
return 0;
}
}
compiles to:
foo(char*, unsigned long, unsigned long, unsigned long):
cmp rdx, rsi
jnb .L4
cmp rdx, rcx
jb .L4
cmp rsi, rcx
jbe .L3
movzx eax, BYTE PTR [rdi+rcx]
ret
.L4:
xor eax, eax
ret
.L3:
push rax
mov edi, 1
call exit
The call to exit should be eliminated.</pre>
</div>
</p>
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