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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 - Clang logs "hit!" when compiling sample code with smmintrin.h"
href="https://bugs.llvm.org/show_bug.cgi?id=39079">39079</a>
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<th>Summary</th>
<td>Clang logs "hit!" when compiling sample code with smmintrin.h
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vmpstr@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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</tr></table>
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<pre>Pardon me for the long example, I'm not too familiar with smmintrin. This is
coming from compiling Skia as a part of Chromium, I've tried to reduce the code
as much as I could. This is running on linux:
$ clang++ --version
clang version 8.0.0 (trunk 342523)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -O2 -c test.cpp
hit!
$ cat test.cpp
#include <smmintrin.h>
class Sk2s {
public:
Sk2s(const __m128& vec) : fVec(vec) {}
Sk2s() {}
Sk2s(float val) : fVec(_mm_set1_ps(val)) {}
static Sk2s Load(const void* ptr) {
return _mm_castsi128_ps(_mm_loadl_epi64((const __m128i*)ptr));
}
void store(void* ptr) const { _mm_storel_pi((__m64*)ptr, fVec); }
Sk2s operator+(const Sk2s& o) const { return _mm_add_ps(fVec, o.fVec); }
__m128 fVec;
};
struct SkPoint {
float fX;
float fY;
};
static inline SkPoint to_point(const Sk2s& x) {
SkPoint point;
x.store(&point);
return point;
}
static inline Sk2s from_point(const SkPoint& point) { return
Sk2s::Load(&point); }
class SkConic {
public:
void chop(SkConic* dst) const;
SkPoint fPts[3];
};
void SkConic::chop(SkConic* dst) const {
Sk2s p0 = from_point(fPts[0]);
Sk2s p1 = from_point(fPts[1]);
Sk2s p2 = from_point(fPts[2]);
SkPoint mPt = to_point(p0);
if (rand()) {
mPt.fX = fPts[0].fX + fPts[1].fX + fPts[2].fX;
}
dst[0].fPts[0] = mPt;
dst[0].fPts[1] = to_point(p0 + p1);
dst[0].fPts[2] = mPt;
}
There seems to be "hit!" printed out to the console, which I don't think is
expected.</pre>
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