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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 - PowerPC: inline assembly doesn't know the difference between altivec and vsx registers"
href="https://bugs.llvm.org/show_bug.cgi?id=42469">42469</a>
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<th>Summary</th>
<td>PowerPC: inline assembly doesn't know the difference between altivec and vsx registers
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>8.0
</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
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>slandden@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>AltiVec registers are differn't registers from VSX registers, and even when the
VSX register class ("wa"[1]) is specified to an inline assembly, gcc doesn't
put the variable in the right register
#include <altivec.h>
#include <stdint.h>
void store_unaligned(vector unsigned char vec, unsigned char *dest) {
uintptr_t zero = 0;
__asm__ volatile ("stxvb16x %0, %1, %2\n\t"
:
: "wa" (vec), "r" (zero), "r" ((uintptr_t)dest));
}
compiled with clang -mvsx unaligned.c --save-temps -c -O3
store_unaligned: # @store_unaligned
.Lfunc_begin0:
# %bb.0:
li 3, 0
#APP
stxvb16x 2, 3, 5 <=== clang needs to move it from vr3 to vs2, but
didn't</pre>
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