[Pixman] [PATCH] mmx: Use MMX2 intrinsics from xmmintrin.h directly.

[Matt Turner]

We had lots of hacks to handle the inability to include xmmintrin.h
without compiling with -msse (lest SSE instructions be used in
pixman-mmx.c). Some recent version of gcc relaxed this restriction.

Change configure.ac to test that xmmintrin.h can be included and that we
can use some intrinsics from it, and remove the work-around code from
pixman-mmx.c.

Evidently allows gcc 4.9.3 to optimize better as well:

   text	   data	    bss	    dec	    hex	filename
 657078	  30848	    680	 688606	  a81de	libpixman-1.so.0.33.3 before
 656710	  30848	    680	 688238	  a806e	libpixman-1.so.0.33.3 after

Signed-off-by: Matt Turner <mattst88 at gmail.com>
---
Looks like _MM_SHUFFLE isn't defined by ARM's mmintrin.h.

 configure.ac        | 15 ++++---------
 pixman/pixman-mmx.c | 64 ++++-------------------------------------------------
 2 files changed, 8 insertions(+), 71 deletions(-)

diff --git a/configure.ac b/configure.ac
index 424bfd3..b04cc69 100644
--- a/configure.ac
+++ b/configure.ac
@@ -347,21 +347,14 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 #error "Need GCC >= 3.4 for MMX intrinsics"
 #endif
 #include <mmintrin.h>
+#include <xmmintrin.h>
 int main () {
     __m64 v = _mm_cvtsi32_si64 (1);
     __m64 w;
 
-    /* Some versions of clang will choke on K */
-    asm ("pshufw %2, %1, %0\n\t"
-        : "=y" (w)
-        : "y" (v), "K" (5)
-    );
-
-    /* Some versions of clang will choke on this */
-    asm ("pmulhuw %1, %0\n\t"
-	: "+y" (w)
-	: "y" (v)
-    );
+    /* Test some intrinsics from xmmintrin.h */
+    w = _mm_shuffle_pi16(v, 5);
+    w = _mm_mulhi_pu16(w, w);
 
     return _mm_cvtsi64_si32 (v);
 }]])], have_mmx_intrinsics=yes)
diff --git a/pixman/pixman-mmx.c b/pixman/pixman-mmx.c
index 05c48a4..88c3a39 100644
--- a/pixman/pixman-mmx.c
+++ b/pixman/pixman-mmx.c
@@ -40,6 +40,9 @@
 #else
 #include <mmintrin.h>
 #endif
+#ifdef USE_X86_MMX
+#include <xmmintrin.h>
+#endif
 #include "pixman-private.h"
 #include "pixman-combine32.h"
 #include "pixman-inlines.h"
@@ -59,66 +62,7 @@ _mm_empty (void)
 }
 #endif
 
-#ifdef USE_X86_MMX
-# if (defined(__SUNPRO_C) || defined(_MSC_VER) || defined(_WIN64))
-#  include <xmmintrin.h>
-# else
-/* We have to compile with -msse to use xmmintrin.h, but that causes SSE
- * instructions to be generated that we don't want. Just duplicate the
- * functions we want to use.  */
-extern __inline int __attribute__((__gnu_inline__, __always_inline__, __artificial__))
-_mm_movemask_pi8 (__m64 __A)
-{
-    int ret;
-
-    asm ("pmovmskb %1, %0\n\t"
-	: "=r" (ret)
-	: "y" (__A)
-    );
-
-    return ret;
-}
-
-extern __inline __m64 __attribute__((__gnu_inline__, __always_inline__, __artificial__))
-_mm_mulhi_pu16 (__m64 __A, __m64 __B)
-{
-    asm ("pmulhuw %1, %0\n\t"
-	: "+y" (__A)
-	: "y" (__B)
-    );
-    return __A;
-}
-
-#  ifdef __OPTIMIZE__
-extern __inline __m64 __attribute__((__gnu_inline__, __always_inline__, __artificial__))
-_mm_shuffle_pi16 (__m64 __A, int8_t const __N)
-{
-    __m64 ret;
-
-    asm ("pshufw %2, %1, %0\n\t"
-	: "=y" (ret)
-	: "y" (__A), "K" (__N)
-    );
-
-    return ret;
-}
-#  else
-#   define _mm_shuffle_pi16(A, N)					\
-    ({									\
-	__m64 ret;							\
-									\
-	asm ("pshufw %2, %1, %0\n\t"					\
-	     : "=y" (ret)						\
-	     : "y" (A), "K" ((const int8_t)N)				\
-	);								\
-									\
-	ret;								\
-    })
-#  endif
-# endif
-#endif
-
-#ifndef _MSC_VER
+#ifndef _MM_SHUFFLE
 #define _MM_SHUFFLE(fp3,fp2,fp1,fp0) \
  (((fp3) << 6) | ((fp2) << 4) | ((fp1) << 2) | (fp0))
 #endif
-- 
2.4.9