OpenBLAS/kernel/x86_64/sgemv_t_microk_nehalem-4.c

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#define HAVE_KERNEL_4x4 1
static void sgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y) __attribute__ ((noinline));

static void sgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y)
{

	BLASLONG register i = 0;

	__asm__  __volatile__
	(
	"xorps		%%xmm4 , %%xmm4	         \n\t"
	"xorps		%%xmm5 , %%xmm5	         \n\t"
	"xorps		%%xmm6 , %%xmm6	         \n\t"
	"xorps		%%xmm7 , %%xmm7	         \n\t"

	".p2align 4				 \n\t"
	"1:				 \n\t"

	"movups	       (%2,%0,4), %%xmm12              \n\t"   // 4 * x
	"movups        (%4,%0,4), %%xmm8               \n\t"   // 4 * a0
	"movups        (%5,%0,4), %%xmm9               \n\t"   // 4 * a1
	"movups        (%6,%0,4), %%xmm10              \n\t"   // 4 * a2
	"movups        (%7,%0,4), %%xmm11              \n\t"   // 4 * a3

	"mulps		%%xmm12, %%xmm8		       \n\t"
	"mulps		%%xmm12, %%xmm9		       \n\t"
	"mulps		%%xmm12, %%xmm10	       \n\t"
	"mulps		%%xmm12, %%xmm11	       \n\t"
	"addps		%%xmm8 , %%xmm4		       \n\t"
        "addq		$4 , %0	  	 	       \n\t"
	"addps		%%xmm9 , %%xmm5		       \n\t"
	"subq	        $4 , %1			       \n\t"		
	"addps		%%xmm10, %%xmm6		       \n\t"
	"addps		%%xmm11, %%xmm7		       \n\t"

	"jnz		1b		       \n\t"

        "haddps        %%xmm4, %%xmm4  \n\t"
        "haddps        %%xmm5, %%xmm5  \n\t"
        "haddps        %%xmm6, %%xmm6  \n\t"
        "haddps        %%xmm7, %%xmm7  \n\t"

        "haddps        %%xmm4, %%xmm4  \n\t"
        "haddps        %%xmm5, %%xmm5  \n\t"
        "haddps        %%xmm6, %%xmm6  \n\t"
        "haddps        %%xmm7, %%xmm7  \n\t"

        "movss         %%xmm4,    (%3)         \n\t"
        "movss         %%xmm5,   4(%3)         \n\t"
        "movss         %%xmm6,   8(%3)         \n\t"
        "movss         %%xmm7,  12(%3)         \n\t"

	:
          "+r" (i),	// 0	
	  "+r" (n)  	// 1
        : 
          "r" (x),      // 2
          "r" (y),      // 3
          "r" (ap[0]),  // 4
          "r" (ap[1]),  // 5
          "r" (ap[2]),  // 6
          "r" (ap[3])   // 7
	: "cc", 
	  "%xmm4", "%xmm5", "%xmm6", "%xmm7", 
	  "%xmm8", "%xmm9", "%xmm10", "%xmm11",
	  "%xmm12",
	  "memory"
	);

}