OpenBLAS/kernel/x86_64/sdot_microk_nehalem-2.c

/***************************************************************************
Copyright (c) 2014, The OpenBLAS Project
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#define HAVE_KERNEL_16 1
static void sdot_kernel_16( BLASLONG n, FLOAT *x, FLOAT *y , FLOAT *dot) __attribute__ ((noinline));

static void sdot_kernel_16( BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *dot)
{


	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                  (%3,%0,4), %%xmm8          \n\t"  // 4 * x
        "movups                16(%2,%0,4), %%xmm13         \n\t"  // 4 * x
        "movups                16(%3,%0,4), %%xmm9          \n\t"  // 4 * x
        "movups                32(%2,%0,4), %%xmm14         \n\t"  // 4 * x
        "movups                32(%3,%0,4), %%xmm10         \n\t"  // 4 * x
        "movups                48(%2,%0,4), %%xmm15         \n\t"  // 4 * x
        "movups                48(%3,%0,4), %%xmm11         \n\t"  // 4 * x

	"mulps          %%xmm8 , %%xmm12 		    \n\t"  
	"mulps          %%xmm9 , %%xmm13 		    \n\t"  
	"mulps          %%xmm10, %%xmm14 		    \n\t"  
	"mulps          %%xmm11, %%xmm15 		    \n\t"  

	"addps		%%xmm12, %%xmm4   \n\t"
	"addps		%%xmm13, %%xmm5   \n\t"
	"addps		%%xmm14, %%xmm6   \n\t"
	"addps		%%xmm15, %%xmm7   \n\t"

	"addq		$16, %0	  	 	             \n\t"
	"subq	        $16, %1			             \n\t"		
	"jnz		1b		             \n\t"

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

	"haddps        %%xmm4, %%xmm4	\n\t"
	"haddps        %%xmm4, %%xmm4	\n\t"

	"movss	       %%xmm4,    (%4)	\n\t"

	: 
          "+r" (i),	// 0
	  "+r" (n)  	// 1
        :
          "r" (x),      // 2
          "r" (y),      // 3
          "r" (dot)     // 4
	: "cc", 
	  "%xmm4", "%xmm5", "%xmm6", "%xmm7", 
	  "%xmm8", "%xmm9", "%xmm10", "%xmm11", 
	  "%xmm12", "%xmm13", "%xmm14", "%xmm15",
	  "memory"
	);

}