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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 - [KNL] _MM_HINT_T0 should be a value from 1 to 2"
href="https://bugs.llvm.org/show_bug.cgi?id=32411">32411</a>
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<tr>
<th>Summary</th>
<td>[KNL] _MM_HINT_T0 should be a value from 1 to 2
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<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>Headers
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ilia.taraban@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>==============test.c=================
#include <immintrin.h>
__m512i a;
float arr[1000];
int main()
{
_mm512_prefetch_i32gather_ps(a, (char*)&arr+128, 1, _MM_HINT_T0);
return 0;
}
======================================
<span class="quote">>>>clang -v</span >
clang version 5.0.0 (trunk 298699)
...
<span class="quote">>>>clang -O0 -march=knl test.c</span >
intrin_gather_scatter.c:7:5: error: argument should be a value from 1 to 2
_mm512_prefetch_i32gather_ps(a, (char*)&arr+128, 1, _MM_HINT_T0);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.../lib/clang/5.0.0/include/avx512pfintrin.h:50:3: note: expanded from macro
'_mm512_prefetch_i32gather_ps'
__builtin_ia32_gatherpfdps((__mmask16) -1, \
^
1 error generated.
======================================
In xmmintrin.h there are such rows like:
#define _MM_HINT_T0 3
#define _MM_HINT_T1 2
#define _MM_HINT_T2 1
#define _MM_HINT_NTA 0
Which I think is contrary to the documentation(_MM_HINT_T0 is 1, _MM_HINT_T1 is
2, _MM_HINT_T2 is 3
<a href="https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_prefetch_i32gather_ps&expand=4087">https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_prefetch_i32gather_ps&expand=4087</a>
and
<a href="https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_prefetch_i32extscatter_ps&expand=4087,4083,4083">https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_prefetch_i32extscatter_ps&expand=4087,4083,4083</a>)
These values was made by lattner in -r 112283.
r112283 | lattner | 2010-08-28 00:10:06 +0400 (Sat, 28 Aug 2010) | 2 lines
Changed paths:
M /cfe/trunk/lib/Headers/xmmintrin.h
fix incorrect MM_HINT_ definitions, PR8011
<span class="quote">>>>svn diff -c 112283</span >
Index: xmmintrin.h
======================================
--- xmmintrin.h (revision 112282)
+++ xmmintrin.h (revision 112283)
@@ -632,9 +632,9 @@
_mm_store_ps(p, a);
}
-#define _MM_HINT_T0 1
+#define _MM_HINT_T0 3
#define _MM_HINT_T1 2
-#define _MM_HINT_T2 3
+#define _MM_HINT_T2 1
#define _MM_HINT_NTA 0
------------------------
Intel Software Engineer
Ilia Taraban</pre>
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