OpenBLAS/kernel/power/crot.c

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Copyright (c) 2013-2018, The OpenBLAS Project
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*****************************************************************************/
 
#include "common.h"
 
#if defined(POWER8) || defined(POWER9)

static void crot_kernel_8 (long n, float *x, float *y, float c, float s)
{
  __vector float t0;
  __vector float t1;
  __vector float t2;
  __vector float t3;
  __vector float t4;
  __vector float t5;
  __vector float t6;
  __vector float t7;
  __asm__
    (
       "xscvdpspn   36, %x[cos]               \n\t" // load c to all words
       "xxspltw     36, 36, 0                 \n\t" 
       "xscvdpspn   37, %x[sin]               \n\t" // load s to all words
       "xxspltw     37, 37, 0                 \n\t" 
       "lxvd2x      32, 0, %[x_ptr]           \n\t" // load x
       "lxvd2x      33, %[i16], %[x_ptr]      \n\t" 
       "lxvd2x      34, %[i32], %[x_ptr]      \n\t" 
       "lxvd2x      35, %[i48], %[x_ptr]      \n\t" 
       "lxvd2x      48, 0, %[y_ptr]           \n\t" // load y
       "lxvd2x      49, %[i16], %[y_ptr]      \n\t" 
       "lxvd2x      50, %[i32], %[y_ptr]      \n\t" 
       "lxvd2x      51, %[i48], %[y_ptr]      \n\t" 
       "addi        %[x_ptr], %[x_ptr], 64    \n\t" 
       "addi        %[y_ptr], %[y_ptr], 64    \n\t" 
       "addic.      %[temp_n], %[temp_n], -8  \n\t" 
       "ble         two%=                        \n\t" 
       ".align    5                         \n\t" 
       "one%=:                                    \n\t" 
       "xvmulsp     40, 32, 36                \n\t" // c * x
       "xvmulsp     41, 33, 36                \n\t" 
       "xvmulsp     42, 34, 36                \n\t" 
       "xvmulsp     43, 35, 36                \n\t" 
       "xvmulsp     %x[x0], 48, 36            \n\t" // c * y
       "xvmulsp     %x[x2], 49, 36            \n\t" 
       "xvmulsp     %x[x1], 50, 36            \n\t" 
       "xvmulsp     %x[x3], 51, 36            \n\t" 
       "xvmulsp     44, 32, 37                \n\t" // s * x
       "xvmulsp     45, 33, 37                \n\t" 
       "lxvd2x      32, 0, %[x_ptr]           \n\t" // load x
       "lxvd2x      33, %[i16], %[x_ptr]      \n\t" 
       "xvmulsp     46, 34, 37                \n\t" 
       "xvmulsp     47, 35, 37                \n\t" 
       "lxvd2x      34, %[i32], %[x_ptr]      \n\t" 
       "lxvd2x      35, %[i48], %[x_ptr]      \n\t" 
       "xvmulsp     %x[x4], 48, 37            \n\t" // s * y
       "xvmulsp     %x[x5], 49, 37            \n\t" 
       "lxvd2x      48, 0, %[y_ptr]           \n\t" // load y
       "lxvd2x      49, %[i16], %[y_ptr]      \n\t" 
       "xvmulsp     %x[x6], 50, 37            \n\t" 
       "xvmulsp     %x[x7], 51, 37            \n\t" 
       "lxvd2x      50, %[i32], %[y_ptr]      \n\t" 
       "lxvd2x      51, %[i48], %[y_ptr]      \n\t" 
       "xvaddsp     40, 40, %x[x4]            \n\t" // c * x + s * y
       "xvaddsp     41, 41, %x[x5]            \n\t" // c * x + s * y
       "addi        %[x_ptr], %[x_ptr], -64   \n\t" 
       "addi        %[y_ptr], %[y_ptr], -64   \n\t" 
       "xvaddsp     42, 42, %x[x6]            \n\t" // c * x + s * y
       "xvaddsp     43, 43, %x[x7]            \n\t" // c * x + s * y
       "xvsubsp     %x[x0], %x[x0], 44        \n\t" // c * y - s * x
       "xvsubsp     %x[x2], %x[x2], 45        \n\t" // c * y - s * x
       "xvsubsp     %x[x1], %x[x1], 46        \n\t" // c * y - s * x
       "xvsubsp     %x[x3], %x[x3], 47        \n\t" // c * y - s * x
       "stxvd2x     40, 0, %[x_ptr]           \n\t" // store x
       "stxvd2x     41, %[i16], %[x_ptr]      \n\t" 
       "stxvd2x     42, %[i32], %[x_ptr]      \n\t" 
       "stxvd2x     43, %[i48], %[x_ptr]      \n\t" 
       "stxvd2x     %x[x0], 0, %[y_ptr]       \n\t" // store y
       "stxvd2x     %x[x2], %[i16], %[y_ptr]  \n\t" 
       "stxvd2x     %x[x1], %[i32], %[y_ptr]  \n\t" 
       "stxvd2x     %x[x3], %[i48], %[y_ptr]  \n\t" 
       "addi        %[x_ptr], %[x_ptr], 128   \n\t" 
       "addi        %[y_ptr], %[y_ptr], 128   \n\t" 
       "addic.      %[temp_n], %[temp_n], -8  \n\t" 
       "bgt         one%=                        \n\t" 
       "two%=:                                    \n\t" 
       "xvmulsp     40, 32, 36                \n\t" // c * x
       "xvmulsp     41, 33, 36                \n\t" 
       "xvmulsp     42, 34, 36                \n\t" 
       "xvmulsp     43, 35, 36                \n\t" 
       "xvmulsp     %x[x0], 48, 36            \n\t" // c * y
       "xvmulsp     %x[x2], 49, 36            \n\t" 
       "xvmulsp     %x[x1], 50, 36            \n\t" 
       "xvmulsp     %x[x3], 51, 36            \n\t" 
       "xvmulsp     44, 32, 37                \n\t" // s * x
       "xvmulsp     45, 33, 37                \n\t" 
       "xvmulsp     46, 34, 37                \n\t" 
       "xvmulsp     47, 35, 37                \n\t" 
       "xvmulsp     %x[x4], 48, 37            \n\t" // s * y
       "xvmulsp     %x[x5], 49, 37            \n\t" 
       "xvmulsp     %x[x6], 50, 37            \n\t" 
       "xvmulsp     %x[x7], 51, 37            \n\t" 
       "addi        %[x_ptr], %[x_ptr], -64   \n\t" 
       "addi        %[y_ptr], %[y_ptr], -64   \n\t" 
       "xvaddsp     40, 40, %x[x4]            \n\t" // c * x + s * y
       "xvaddsp     41, 41, %x[x5]            \n\t" // c * x + s * y
       "xvaddsp     42, 42, %x[x6]            \n\t" // c * x + s * y
       "xvaddsp     43, 43, %x[x7]            \n\t" // c * x + s * y
       "xvsubsp     %x[x0], %x[x0], 44        \n\t" // c * y - s * x
       "xvsubsp     %x[x2], %x[x2], 45        \n\t" // c * y - s * x
       "xvsubsp     %x[x1], %x[x1], 46        \n\t" // c * y - s * x
       "xvsubsp     %x[x3], %x[x3], 47        \n\t" // c * y - s * x
       "stxvd2x     40, 0, %[x_ptr]           \n\t" // store x
       "stxvd2x     41, %[i16], %[x_ptr]      \n\t" 
       "stxvd2x     42, %[i32], %[x_ptr]      \n\t" 
       "stxvd2x     43, %[i48], %[x_ptr]      \n\t" 
       "stxvd2x     %x[x0], 0, %[y_ptr]       \n\t" // store y
       "stxvd2x     %x[x2], %[i16], %[y_ptr]  \n\t" 
       "stxvd2x     %x[x1], %[i32], %[y_ptr]  \n\t" 
       "stxvd2x     %x[x3], %[i48], %[y_ptr]  "
     :
       [mem_x]  "+m"  (*(float (*)[2*n])x),
       [mem_y]  "+m"  (*(float (*)[2*n])y),
       [temp_n] "+r"  (n),
       [x_ptr]  "+&b" (x),
       [y_ptr]  "+&b" (y),
       [x0]     "=wa" (t0),
       [x1]     "=wa" (t2),
       [x2]     "=wa" (t1),
       [x3]     "=wa" (t3),
       [x4]     "=wa" (t4),
       [x5]     "=wa" (t5),
       [x6]     "=wa" (t6),
       [x7]     "=wa" (t7)     
     : 
       [cos]    "f"   (c),
       [sin]    "f"   (s),
       [i16]    "b"   (16),
       [i32]    "b"   (32),
       [i48]    "b"   (48)     
     :
       "cr0",
       "vs32","vs33","vs34","vs35","vs36","vs37",
       "vs40","vs41","vs42","vs43","vs44","vs45","vs46","vs47",
       "vs48","vs49","vs50","vs51"
     );
}
 
#endif


int CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT c, FLOAT s)
{
   BLASLONG i=0;
    BLASLONG ix=0,iy=0;
    FLOAT temp[2];
    BLASLONG inc_x2;
    BLASLONG inc_y2;

    if ( n <= 0     )  return(0); 

    if ( (inc_x == 1) && (inc_y == 1) )
    {

        BLASLONG n1 = n & -8; 
        if ( n1 > 0 )
        { 
            crot_kernel_8(n1, x, y, c, s);
            i=n1; 
            ix=2*n1; 
        }

         while(i < n)
           {
                temp[0]   = c*x[ix]   + s*y[ix] ;
                temp[1]   = c*x[ix+1] + s*y[ix+1] ;
                y[ix]     = c*y[ix]   - s*x[ix] ;
                y[ix+1]   = c*y[ix+1] - s*x[ix+1] ;
                x[ix]     = temp[0] ;
                x[ix+1]   = temp[1] ;

                ix += 2 ; 
                i++ ;

            }

    }
    else
    {
        inc_x2 = 2 * inc_x ;
        inc_y2 = 2 * inc_y ;
        while(i < n)
        {
            temp[0]   = c*x[ix]   + s*y[iy] ;
            temp[1]   = c*x[ix+1] + s*y[iy+1] ;
            y[iy]     = c*y[iy]   - s*x[ix] ;
            y[iy+1]   = c*y[iy+1] - s*x[ix+1] ;
            x[ix]     = temp[0] ;
            x[ix+1]   = temp[1] ;

            ix += inc_x2 ;
            iy += inc_y2 ;
            i++ ;

        }
    }
	return(0);
}