OpenBLAS/kernel/zarch/cscal.c

/***************************************************************************
Copyright (c) 2013 - 2017, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
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2. Redistributions in binary form must reproduce the above copyright
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the documentation and/or other materials provided with the
distribution.
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its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

#include "common.h"

static void cscal_kernel_16(BLASLONG n, FLOAT *alpha, FLOAT *x)
{
    __asm__ volatile(
        "vlrepf %%v0,0(%1)              \n\t"
        "vlef   %%v1,4(%1),0            \n\t"
        "vlef   %%v1,4(%1),2            \n\t"
        "vflcsb %%v1,%%v1               \n\t"
        "vlef   %%v1,4(%1),1            \n\t"
        "vlef   %%v1,4(%1),3            \n\t"
        "srlg %%r0,%0,4                 \n\t"
        "xgr   %%r1,%%r1                \n\t"
        "0:                             \n\t"
        "pfd 2, 1024(%%r1,%2)           \n\t"

        "vl   %%v16,0(%%r1,%2)          \n\t"
        "vl   %%v17,16(%%r1,%2)         \n\t"
        "vl   %%v18,32(%%r1,%2)         \n\t"
        "vl   %%v19,48(%%r1,%2)         \n\t"
        "vl   %%v20,64(%%r1,%2)         \n\t"
        "vl   %%v21,80(%%r1,%2)         \n\t"
        "vl   %%v22,96(%%r1,%2)         \n\t"
        "vl   %%v23,112(%%r1,%2)        \n\t"
        "verllg   %%v24,%%v16,32        \n\t"
        "verllg   %%v25,%%v17,32        \n\t"
        "verllg   %%v26,%%v18,32        \n\t"
        "verllg   %%v27,%%v19,32        \n\t"
        "verllg   %%v28,%%v20,32        \n\t"
        "verllg   %%v29,%%v21,32        \n\t"
        "verllg   %%v30,%%v22,32        \n\t"
        "verllg   %%v31,%%v23,32        \n\t"

        "vfmsb %%v16,%%v16,%%v0         \n\t"
        "vfmsb %%v17,%%v17,%%v0         \n\t"
        "vfmsb %%v18,%%v18,%%v0         \n\t"
        "vfmsb %%v19,%%v19,%%v0         \n\t"
        "vfmsb %%v20,%%v20,%%v0         \n\t"
        "vfmsb %%v21,%%v21,%%v0         \n\t"
        "vfmsb %%v22,%%v22,%%v0         \n\t"
        "vfmsb %%v23,%%v23,%%v0         \n\t"
        "vfmasb %%v16,%%v24,%%v1,%%v16  \n\t"
        "vfmasb %%v17,%%v25,%%v1,%%v17  \n\t"
        "vfmasb %%v18,%%v26,%%v1,%%v18  \n\t"
        "vfmasb %%v19,%%v27,%%v1,%%v19  \n\t"
        "vfmasb %%v20,%%v28,%%v1,%%v20  \n\t"
        "vfmasb %%v21,%%v29,%%v1,%%v21  \n\t"
        "vfmasb %%v22,%%v30,%%v1,%%v22  \n\t"
        "vfmasb %%v23,%%v31,%%v1,%%v23  \n\t"

        "vst %%v16,0(%%r1,%2)           \n\t"
        "vst %%v17,16(%%r1,%2)          \n\t"
        "vst %%v18,32(%%r1,%2)          \n\t"
        "vst %%v19,48(%%r1,%2)          \n\t"
        "vst %%v20,64(%%r1,%2)          \n\t"
        "vst %%v21,80(%%r1,%2)          \n\t"
        "vst %%v22,96(%%r1,%2)          \n\t"
        "vst %%v23,112(%%r1,%2)         \n\t"

        "agfi  %%r1,128                 \n\t"
        "brctg %%r0,0b                      "
        :
        :"r"(n),"ZQ"((const FLOAT (*)[2])alpha),"ZR"((FLOAT (*)[n * 2])x)
        :"memory","cc","r0","r1","v0","v1","v16","v17","v18","v19","v20","v21","v22","v23","v24","v25","v26","v27","v28","v29","v30","v31"
    );
}
 
static void cscal_kernel_16_zero_r(BLASLONG n, FLOAT *alpha, FLOAT *x)
{
    __asm__ volatile(
        "vlef   %%v0,4(%1),0            \n\t"
        "vlef   %%v0,4(%1),2            \n\t"
        "vflcsb %%v0,%%v0               \n\t"
        "vlef   %%v0,4(%1),1            \n\t"
        "vlef   %%v0,4(%1),3            \n\t"
        "srlg %%r0,%0,4                 \n\t"
        "xgr   %%r1,%%r1                \n\t"
        "0:                             \n\t"
        "pfd 2, 1024(%%r1,%2)           \n\t"

        "vl   %%v16,0(%%r1,%2)          \n\t"
        "vl   %%v17,16(%%r1,%2)         \n\t"
        "vl   %%v18,32(%%r1,%2)         \n\t"
        "vl   %%v19,48(%%r1,%2)         \n\t"
        "vl   %%v20,64(%%r1,%2)         \n\t"
        "vl   %%v21,80(%%r1,%2)         \n\t"
        "vl   %%v22,96(%%r1,%2)         \n\t"
        "vl   %%v23,112(%%r1,%2)        \n\t"
        "verllg   %%v16,%%v16,32        \n\t"
        "verllg   %%v17,%%v17,32        \n\t"
        "verllg   %%v18,%%v18,32        \n\t"
        "verllg   %%v19,%%v19,32        \n\t"
        "verllg   %%v20,%%v20,32        \n\t"
        "verllg   %%v21,%%v21,32        \n\t"
        "verllg   %%v22,%%v22,32        \n\t"
        "verllg   %%v23,%%v23,32        \n\t"

        "vfmsb %%v16,%%v16,%%v0         \n\t"
        "vfmsb %%v17,%%v17,%%v0         \n\t"
        "vfmsb %%v18,%%v18,%%v0         \n\t"
        "vfmsb %%v19,%%v19,%%v0         \n\t"
        "vfmsb %%v20,%%v20,%%v0         \n\t"
        "vfmsb %%v21,%%v21,%%v0         \n\t"
        "vfmsb %%v22,%%v22,%%v0         \n\t"
        "vfmsb %%v23,%%v23,%%v0         \n\t"

        "vst %%v16,0(%%r1,%2)           \n\t"
        "vst %%v17,16(%%r1,%2)          \n\t"
        "vst %%v18,32(%%r1,%2)          \n\t"
        "vst %%v19,48(%%r1,%2)          \n\t"
        "vst %%v20,64(%%r1,%2)          \n\t"
        "vst %%v21,80(%%r1,%2)          \n\t"
        "vst %%v22,96(%%r1,%2)          \n\t"
        "vst %%v23,112(%%r1,%2)         \n\t"

        "agfi  %%r1,128                 \n\t"
        "brctg %%r0,0b                      "
        :
        :"r"(n),"ZQ"((const FLOAT (*)[2])alpha),"ZR"((FLOAT (*)[n * 2])x)
        :"memory","cc","r0","r1","v0","v16","v17","v18","v19","v20","v21","v22","v23"
    );
}

static void cscal_kernel_16_zero_i(BLASLONG n, FLOAT *alpha, FLOAT *x)
{
    __asm__ volatile(
        "vlrepf %%v0,0(%1)              \n\t"
        "srlg %%r0,%0,4                 \n\t"
        "xgr   %%r1,%%r1                \n\t"
        "0:                             \n\t"
        "pfd 2, 1024(%%r1,%2)           \n\t"

        "vl   %%v16,0(%%r1,%2)          \n\t"
        "vl   %%v17,16(%%r1,%2)         \n\t"
        "vl   %%v18,32(%%r1,%2)         \n\t"
        "vl   %%v19,48(%%r1,%2)         \n\t"
        "vl   %%v20,64(%%r1,%2)         \n\t"
        "vl   %%v21,80(%%r1,%2)         \n\t"
        "vl   %%v22,96(%%r1,%2)         \n\t"
        "vl   %%v23,112(%%r1,%2)        \n\t"

        "vfmsb %%v16,%%v16,%%v0         \n\t"
        "vfmsb %%v17,%%v17,%%v0         \n\t"
        "vfmsb %%v18,%%v18,%%v0         \n\t"
        "vfmsb %%v19,%%v19,%%v0         \n\t"
        "vfmsb %%v20,%%v20,%%v0         \n\t"
        "vfmsb %%v21,%%v21,%%v0         \n\t"
        "vfmsb %%v22,%%v22,%%v0         \n\t"
        "vfmsb %%v23,%%v23,%%v0         \n\t"

        "vst %%v16,0(%%r1,%2)           \n\t"
        "vst %%v17,16(%%r1,%2)          \n\t"
        "vst %%v18,32(%%r1,%2)          \n\t"
        "vst %%v19,48(%%r1,%2)          \n\t"
        "vst %%v20,64(%%r1,%2)          \n\t"
        "vst %%v21,80(%%r1,%2)          \n\t"
        "vst %%v22,96(%%r1,%2)          \n\t"
        "vst %%v23,112(%%r1,%2)         \n\t"

        "agfi  %%r1,128                 \n\t"
        "brctg %%r0,0b                      "
        :
        :"r"(n),"ZQ"((const FLOAT (*)[2])alpha),"ZR"((FLOAT (*)[n * 2])x)
        :"memory","cc","r0","r1","v0","v16","v17","v18","v19","v20","v21","v22","v23"
    );
}

static void cscal_kernel_16_zero(BLASLONG n,  FLOAT *x)
{
    __asm__ volatile(
        "vzero %%v24             \n\t"
        "vzero %%v25             \n\t"
        "vzero %%v26             \n\t"
        "vzero %%v27             \n\t"
        "srlg %%r0,%0,4          \n\t"
        "xgr   %%r1,%%r1         \n\t"
        "0:                      \n\t"
        "pfd 2, 1024(%%r1,%1)    \n\t"

        "vst  %%v24,0(%%r1,%1)   \n\t"
        "vst  %%v25,16(%%r1,%1)  \n\t"
        "vst  %%v26,32(%%r1,%1)  \n\t"
        "vst  %%v27,48(%%r1,%1)  \n\t"
        "vst  %%v24,64(%%r1,%1)  \n\t"
        "vst  %%v25,80(%%r1,%1)  \n\t"
        "vst  %%v26,96(%%r1,%1)  \n\t"
        "vst  %%v27,112(%%r1,%1) \n\t"
    
        "agfi  %%r1,128          \n\t"
        "brctg %%r0,0b               "
        :
        :"r"(n),"ZR"((FLOAT (*)[n * 2])x)
        :"memory","cc","r0","r1","v24","v25","v26","v27"
    );
}

static void cscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)
{
    BLASLONG i;
    BLASLONG inc_x2 = 2 * inc_x;
    BLASLONG inc_x3 = inc_x2 + inc_x;
    FLOAT t0, t1, t2, t3;
    FLOAT da_r = alpha[0];
    FLOAT da_i = alpha[1];

    for (i = 0; i < n; i += 4)
    {
        t0 = da_r * x[0] - da_i * x[1];
        t1 = da_r * x[inc_x] - da_i * x[inc_x + 1];
        t2 = da_r * x[inc_x2] - da_i * x[inc_x2 + 1];
        t3 = da_r * x[inc_x3] - da_i * x[inc_x3 + 1];

        x[1] = da_i * x[0] + da_r * x[1];
        x[inc_x + 1] = da_i * x[inc_x] + da_r * x[inc_x + 1];
        x[inc_x2 + 1] = da_i * x[inc_x2] + da_r * x[inc_x2 + 1];
        x[inc_x3 + 1] = da_i * x[inc_x3] + da_r * x[inc_x3 + 1];

        x[0] = t0;
        x[inc_x] = t1;
        x[inc_x2] = t2;
        x[inc_x3] = t3;

        x += 4 * inc_x;
    }
}

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da_r, FLOAT da_i, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2) {
    BLASLONG i = 0, j = 0;
    FLOAT temp0;
    FLOAT temp1;
    FLOAT alpha[2] __attribute__ ((aligned(16)));

    if (inc_x != 1) {
        inc_x <<= 1;

        if (da_r == 0.0) {

            BLASLONG n1 = n & -2;

            if (da_i == 0.0) {

                while (j < n1) {

                    x[i] = 0.0;
                    x[i + 1] = 0.0;
                    x[i + inc_x] = 0.0;
                    x[i + 1 + inc_x] = 0.0;
                    i += 2 * inc_x;
                    j += 2;

                }

                while (j < n) {

                    x[i] = 0.0;
                    x[i + 1] = 0.0;
                    i += inc_x;
                    j++;

                }

            } else {

                while (j < n1) {

                    temp0 = -da_i * x[i + 1];
                    x[i + 1] = da_i * x[i];
                    x[i] = temp0;
                    temp1 = -da_i * x[i + 1 + inc_x];
                    x[i + 1 + inc_x] = da_i * x[i + inc_x];
                    x[i + inc_x] = temp1;
                    i += 2 * inc_x;
                    j += 2;

                }

                while (j < n) {

                    temp0 = -da_i * x[i + 1];
                    x[i + 1] = da_i * x[i];
                    x[i] = temp0;
                    i += inc_x;
                    j++;

                }



            }

        } else {


            if (da_i == 0.0) {
                BLASLONG n1 = n & -2;

                while (j < n1) {

                    temp0 = da_r * x[i];
                    x[i + 1] = da_r * x[i + 1];
                    x[i] = temp0;
                    temp1 = da_r * x[i + inc_x];
                    x[i + 1 + inc_x] = da_r * x[i + 1 + inc_x];
                    x[i + inc_x] = temp1;
                    i += 2 * inc_x;
                    j += 2;

                }

                while (j < n) {

                    temp0 = da_r * x[i];
                    x[i + 1] = da_r * x[i + 1];
                    x[i] = temp0;
                    i += inc_x;
                    j++;

                }

            } else {

                BLASLONG n1 = n & -8;
                if (n1 > 0) {
                    alpha[0] = da_r;
                    alpha[1] = da_i;
                    cscal_kernel_inc_8(n1, alpha, x, inc_x);
                    j = n1;
                    i = n1 * inc_x;
                }

                while (j < n) {

                    temp0 = da_r * x[i] - da_i * x[i + 1];
                    x[i + 1] = da_r * x[i + 1] + da_i * x[i];
                    x[i] = temp0;
                    i += inc_x;
                    j++;

                }

            }

        }

        return (0);
    }


    BLASLONG n1 = n & -16;
    if (n1 > 0) {

        alpha[0] = da_r;
        alpha[1] = da_i;

        if (da_r == 0.0)
            if (da_i == 0)
                cscal_kernel_16_zero(n1,  x);
            else
                cscal_kernel_16_zero_r(n1, alpha, x);
        else
            if (da_i == 0)
            cscal_kernel_16_zero_i(n1, alpha, x);
        else
            cscal_kernel_16(n1, alpha, x);

        i = n1 << 1;
        j = n1;
    }


    if (da_r == 0.0) {

        if (da_i == 0.0) {

            while (j < n) {

                x[i] = 0.0;
                x[i + 1] = 0.0;
                i += 2;
                j++;

            }

        } else {

            while (j < n) {

                temp0 = -da_i * x[i + 1];
                x[i + 1] = da_i * x[i];
                x[i] = temp0;
                i += 2;
                j++;

            }

        }

    } else {

        if (da_i == 0.0) {

            while (j < n) {

                temp0 = da_r * x[i];
                x[i + 1] = da_r * x[i + 1];
                x[i] = temp0;
                i += 2;
                j++;

            }

        } else {

            while (j < n) {

                temp0 = da_r * x[i] - da_i * x[i + 1];
                x[i + 1] = da_r * x[i + 1] + da_i * x[i];
                x[i] = temp0;
                i += 2;
                j++;

            }

        }

    }

    return (0);
}