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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Run loop-idiom with -Oz"
href="https://bugs.llvm.org/show_bug.cgi?id=48737">48737</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Run loop-idiom with -Oz
</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>Linux
</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>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>void copy(float *__restrict__ d, float *__restrict__ s, __SIZE_TYPE__ sz) {
__SIZE_TYPE__ i;
for (i = 0; i < sz; i++) {
*d++ = *s++;
}
}
-Os
copy(float*, float*, unsigned long): # @copy(float*,
float*, unsigned long)
test rdx, rdx
je .LBB0_2
push rax
shl rdx, 2
call memcpy@PLT
add rsp, 8
.LBB0_2:
ret
-Oz
copy(float*, float*, unsigned long): # @copy(float*,
float*, unsigned long)
xor eax, eax
.LBB0_1: # =>This Inner Loop Header: Depth=1
cmp rdx, rax
je .LBB0_3
movss xmm0, dword ptr [rsi + 4*rax] # xmm0 = mem[0],zero,zero,zero
movss dword ptr [rdi + 4*rax], xmm0
inc rax
jmp .LBB0_1
.LBB0_3:
ret
<a href="https://godbolt.org/z/61EnzG">https://godbolt.org/z/61EnzG</a></pre>
</div>
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