On 23/11/2013 13:29, Dimitry Andric wrote:
On 01 Nov 2013, at 17:15, Alexey Dokuchaev <[email protected]> wrote:
I've recently encountered a piece of code that uses some SSE2 intrinsics
and builds with gcc46, but not clang: clang can't find _mm_movpi64_epi64(),
while gcc46 defines it in its lib/gcc46/gcc/.../4.6.3/include/emmintrin.h:
extern __inline __m128i __attribute__((__gnu_inline__, __always_inline__,
__artificial__))
_mm_movpi64_epi64 (__m64 __A)
{
return _mm_set_epi64 ((__m64)0LL, __A);
}
extern __inline __m128i __attribute__((__gnu_inline__, __always_inline__,
__artificial__))
_mm_set_epi64x (long long __q1, long long __q0)
{
return __extension__ (__m128i)(__v2di){ __q0, __q1 };
}
Now, Clang in /usr/include/clang/3.3/emmintrin.h defines similar function,
but without the `e', _mm_movpi64_pi64():
static __inline__ __m128i __attribute__((__always_inline__, __nodebug__))
_mm_movpi64_pi64(__m64 __a)
{
return (__m128i){ (long long)__a, 0 };
}
Microsoft (http://msdn.microsoft.com/en-us/library/has3d153(v=vs.90).aspx)
defines these two:
_mm_movepi64_pi64 MOVDQ2Q Move
_mm_movpi64_epi64 MOVQ2DQ Move
That is:
__m64 _mm_movepi64_pi64 (__m128i a);
MOVDQ2Q
r0 := a0 ;
__m128i _mm_movpi64_epi64 (__m64 a);
MOVDQ2Q
r0 := a0 ; r1 := 0X0 ;
Cf. Intel's manual [1]:
_mm_movepi64_pi64 Move MOVDQ2Q
_mm_movpi64_epi64 Move MOVDQ2Q
__m64 _mm_movepi64_pi64(__m128i a)
Returns the lower 64 bits of a as an __m64 type: R0 := a0
__m128i _mm_movpi64_pi64(__m64 a) <<< TYPO?!
Moves the 64 bits of a to the lower 64 bits
of the result, zeroing the upper bits: R0 := a0, R1 = 0X0
Assuming that both documents correctly assign instructions to function
names (bonus clue: it also makes them symmetrical), then _mm_movpi64_pi64
is indeed a typo and Clang's header is wrong, while GCC's is correct: it
should read _mm_movpi64_epi64(), not _mm_movpi64_pi64().
Hi Alexey,
This belongs on the cfe-commits list, and I have already posted the same fix
there:
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20131104/092514.html
Alexey, nice investigation. I've confirmed correctness and landed
Dimitry's patch in r195558.
Alp.
-Dimitry
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