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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 - Use paddusb for saturated add/sub"
href="https://bugs.llvm.org/show_bug.cgi?id=41248">41248</a>
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</tr>
<tr>
<th>Summary</th>
<td>Use paddusb for saturated add/sub
</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>Backend: X86
</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>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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</tr></table>
<p>
<div>
<pre>Code from other PR:
void add_clamp_2(unsigned char *ptr) {
for (unsigned i = 0; i != 16; ++i) {
unsigned char s = *ptr;
*ptr++ = (s + HI) > 255 ? 255 : (s + HI);
}
}
void add_clamp_3(unsigned char *ptr) {
for (unsigned i = 0; i != 16; ++i) {
unsigned char s = *ptr;
*ptr++ = (s + HI) >= 255 ? 255 : (s + HI);
}
}
add_clamp_2(unsigned char*): # @add_clamp_2(unsigned
char*)
movdqu xmm0, xmmword ptr [rdi]
pminub xmm0, xmmword ptr [rip + .LCPI2_0]
paddb xmm0, xmmword ptr [rip + .LCPI2_1]
movdqu xmmword ptr [rdi], xmm0
ret
add_clamp_3(unsigned char*): # @add_clamp_3(unsigned
char*)
movdqu xmm0, xmmword ptr [rdi]
pminub xmm0, xmmword ptr [rip + .LCPI3_0]
paddb xmm0, xmmword ptr [rip + .LCPI3_1]
movdqu xmmword ptr [rdi], xmm0
ret
ICC 19 uses paddusb here
add_clamp_2(unsigned char*):
movdqu xmm0, XMMWORD PTR [rdi] #22.29
paddusb xmm0, XMMWORD PTR .L_2il0floatpacket.1[rip] #22.29
movdqu XMMWORD PTR [rdi], xmm0 #22.10
ret #24.1
add_clamp_3(unsigned char*):
movdqu xmm0, XMMWORD PTR [rdi] #29.30
paddusb xmm0, XMMWORD PTR .L_2il0floatpacket.1[rip] #29.30
movdqu XMMWORD PTR [rdi], xmm0 #29.10
ret
Maybe use paddusb as well?</pre>
</div>
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