/***************************************************************************
Copyright (c) 2024, 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
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1. Redistributions of source code must retain the above copyright
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its contributors may be used to endorse or promote products
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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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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"

#define SAVE1x4(c1) \
    "vfmul.s $vr"#c1",$vr"#c1",$vr15;vstelm.w $vr"#c1",%4,0,0;add.d %4,%4,%3;\n\t" \
    "vstelm.w $vr"#c1",%4,0,1;add.d %4,%4,%3;vstelm.w $vr"#c1",%4,0,2;add.d %4,%4,%3; \n\t" \
    "vstelm.w $vr"#c1",%4,0,3;add.d %4,%4,%3;\n\t"
#define SAVE_2x4(c1, c2, t1, t2) \
    "vilvl.w $vr"#t1",$vr"#c2",$vr"#c1";vfmul.s $vr"#t1",$vr"#t1",$vr15; \n\t" \
    "vstelm.d $vr"#t1",%4,0,0;add.d %4,%4,%3;vstelm.d $vr"#t1",%4,0,1;add.d %4,%4,%3 \n\t" \
    "vilvh.w $vr"#t2",$vr"#c2",$vr"#c1";vfmul.s $vr"#t2",$vr"#t2",$vr15; \n\t" \
    "vstelm.d $vr"#t2",%4,0,0;add.d %4,%4,%3;vstelm.d $vr"#t2",%4,0,1;add.d %4,%4,%3 \n\t"
#define SAVE_4x1(b1) \
    "vst $vr"#b1",%4,0; add.d %4,%4,%3 \n\t"
#define SAVE_4x2(b1, b2) \
    "vst $vr"#b1",%4,0; add.d %4,%4,%3; vst $vr"#b2",%4,0; add.d %4,%4,%3 \n\t"
#define SAVE_4x4(b1, b2, b3, b4) \
    "vst $vr"#b1",%4,0; add.d %4,%4,%3; vst $vr"#b2",%4,0; add.d %4,%4,%3 \n\t" \
    "vst $vr"#b3",%4,0; add.d %4,%4,%3; vst $vr"#b4",%4,0; add.d %4,%4,%3 \n\t"
#define SAVE_4x8(b1, b2, b3, b4) \
    SAVE_4x4(b1, b2, b3, b4) \
    "xvpermi.q $xr"#b1",$xr"#b1",1; xvpermi.q $xr"#b2",$xr"#b2",1; xvpermi.q $xr"#b3",$xr"#b3",1; xvpermi.q $xr"#b4",$xr"#b4",1; \n\t" \
    SAVE_4x4(b1, b2, b3, b4)

#define TRANS_4x4(a1, a2, a3, a4, t1, t2, t3, t4) \
    "vilvl.w $vr"#t1",$vr"#a2",$vr"#a1";vilvh.w $vr"#t2",$vr"#a2",$vr"#a1"; \n\t" \
    "vilvl.w $vr"#t3",$vr"#a4",$vr"#a3";vilvh.w $vr"#t4",$vr"#a4",$vr"#a3"; \n\t" \
    "vilvl.d $vr"#a1",$vr"#t3",$vr"#t1";vilvh.d $vr"#a2",$vr"#t3",$vr"#t1"; \n\t" \
    "vilvl.d $vr"#a3",$vr"#t4",$vr"#t2";vilvh.d $vr"#a4",$vr"#t4",$vr"#t2"; \n\t"
#define TRANS_4x8(a1, a2, a3, a4, t1, t2, t3, t4) \
    "xvilvl.w $xr"#t1",$xr"#a2",$xr"#a1"; xvilvh.w $xr"#t2",$xr"#a2",$xr"#a1"; \n\t" \
    "xvilvl.w $xr"#t3",$xr"#a4",$xr"#a3"; xvilvh.w $xr"#t4",$xr"#a4",$xr"#a3"; \n\t" \
    "xvilvl.d $xr"#a1",$xr"#t3",$xr"#t1"; xvilvh.d $xr"#a2",$xr"#t3",$xr"#t1"; \n\t" \
    "xvilvl.d $xr"#a3",$xr"#t4",$xr"#t2"; xvilvh.d $xr"#a4",$xr"#t4",$xr"#t2"; \n\t"
#define COPY_4x16 \
    "move %4,%1; addi.d %1,%1,16                      \n\t" \
    "xvld $xr0,%0,0; xvld $xr4,%0,32; add.d %0,%0,%2; \n\t" \
    "xvld $xr1,%0,0; xvld $xr5,%0,32; add.d %0,%0,%2; \n\t" \
    "xvld $xr2,%0,0; xvld $xr6,%0,32; add.d %0,%0,%2; \n\t" \
    "xvld $xr3,%0,0; xvld $xr7,%0,32; add.d %0,%0,%2; \n\t" \
    "xvfmul.s $xr0,$xr0,$xr15;xvfmul.s $xr1,$xr1,$xr15;xvfmul.s $xr2,$xr2,$xr15;xvfmul.s $xr3,$xr3,$xr15 \n\t" \
    "xvfmul.s $xr4,$xr4,$xr15;xvfmul.s $xr5,$xr5,$xr15;xvfmul.s $xr6,$xr6,$xr15;xvfmul.s $xr7,$xr7,$xr15 \n\t" \
    TRANS_4x8(0,1,2,3,8,9,10,11) SAVE_4x8(0,1,2,3)          \
    TRANS_4x8(4,5,6,7,8,9,10,11) SAVE_4x8(4,5,6,7)
#define COPY_4x8 \
    "move %4,%1; addi.d %1,%1,16     \n\t" \
    "xvld $xr0,%0,0; add.d %0,%0,%2; \n\t" \
    "xvld $xr1,%0,0; add.d %0,%0,%2; \n\t" \
    "xvld $xr2,%0,0; add.d %0,%0,%2; \n\t" \
    "xvld $xr3,%0,0; add.d %0,%0,%2; \n\t" \
    "xvfmul.s $xr0,$xr0,$xr15;xvfmul.s $xr1,$xr1,$xr15;xvfmul.s $xr2,$xr2,$xr15;xvfmul.s $xr3,$xr3,$xr15 \n\t" \
    TRANS_4x8(0,1,2,3,8,9,10,11) SAVE_4x8(0,1,2,3)
#define COPY_4x4 \
    "move %4,%1; addi.d %1,%1,16    \n\t" \
    "vld $vr0,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr1,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr2,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr3,%0,0; add.d %0,%0,%2; \n\t" \
    "vfmul.s $vr0,$vr0,$vr15;vfmul.s $vr1,$vr1,$vr15;vfmul.s $vr2,$vr2,$vr15;vfmul.s $vr3,$vr3,$vr15 \n\t" \
    TRANS_4x4(0,1,2,3,8,9,10,11) SAVE_4x4(0,1,2,3)
#define COPY_4x2 \
    "move %4,%1; addi.d %1,%1,16    \n\t" \
    "vld $vr0,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr1,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr2,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr3,%0,0; add.d %0,%0,%2; \n\t" \
    "vfmul.s $vr0,$vr0,$vr15;vfmul.s $vr1,$vr1,$vr15;vfmul.s $vr2,$vr2,$vr15;vfmul.s $vr3,$vr3,$vr15 \n\t" \
    TRANS_4x4(0,1,2,3,8,9,10,11) SAVE_4x2(0,1)
#define COPY_4x1 \
    "move %4,%1; addi.d %1,%1,16     \n\t" \
    "fld.s $f0,%0,0; add.d %0,%0,%2; \n\t" \
    "fld.s $f1,%0,0; add.d %0,%0,%2; \n\t" \
    "fld.s $f2,%0,0; add.d %0,%0,%2; \n\t" \
    "fld.s $f3,%0,0; add.d %0,%0,%2; \n\t" \
    "xvinsve0.w $xr0,$xr1,1;xvinsve0.w $xr0,$xr2,2;xvinsve0.w $xr0,$xr3,3; \n\t" \
    "vfmul.s $vr0,$vr0,$vr15; \n\t" \
    SAVE_4x1(0)

#define COPY_2x16 \
    "move %4,%1; addi.d %1,%1,8                       \n\t" \
    "xvld $xr0,%0,0; xvld $xr2,%0,32; add.d %0,%0,%2; \n\t" \
    "xvld $xr1,%0,0; xvld $xr3,%0,32; add.d %0,%0,%2; \n\t" \
    "xvpermi.q $xr4,$xr0,1;xvpermi.q $xr6,$xr2,1;xvpermi.q $xr5,$xr1,1;xvpermi.q $xr7,$xr3,1; \n\t" \
    SAVE_2x4(0,1,8,9) SAVE_2x4(4,5,8,9) SAVE_2x4(2,3,8,9) SAVE_2x4(6,7,8,9)
#define COPY_2x8 \
    "move %4,%1; addi.d %1,%1,8      \n\t" \
    "xvld $xr0,%0,0; add.d %0,%0,%2; \n\t" \
    "xvld $xr1,%0,0; add.d %0,%0,%2; \n\t" \
    "xvpermi.q $xr2,$xr0,1;xvpermi.q $xr3,$xr1,1; \n\t" \
    SAVE_2x4(0,1,4,5) SAVE_2x4(2,3,4,5)
#define COPY_2x4 \
    "move %4,%1; addi.d %1,%1,8     \n\t" \
    "vld $vr0,%0,0; add.d %0,%0,%2; \n\t" \
    "vld $vr1,%0,0; add.d %0,%0,%2; \n\t" \
    SAVE_2x4(0,1,4,5)
#define COPY_2x2 \
    "move %4,%1; addi.d %1,%1,8     \n\t" \
    "fld.d $f0,%0,0;add.d %0,%0,%2; \n\t" \
    "fld.d $f1,%0,0;add.d %0,%0,%2; \n\t" \
    "xvinsve0.d $xr0,$xr1,1;vfmul.s $vr0,$vr0,$vr15;vshuf4i.w $vr0,$vr0,0xd8 \n\t" \
    "vstelm.d $vr0,%4,0,0;add.d %4,%4,%3;vstelm.d $vr0,%4,0,1 \n\t"
#define COPY_2x1 \
    "move %4,%1; addi.d %1,%1,8     \n\t" \
    "fld.s $f0,%0,0;add.d %0,%0,%2; \n\t" \
    "fld.s $f1,%0,0;add.d %0,%0,%2; \n\t" \
    "xvinsve0.w $xr0,$xr1,1;vfmul.s $vr0,$vr0,$vr15; \n\t" \
    "vstelm.d $vr0,%4,0,0; \n\t"

#define COPY_1x16 \
    "move %4,%1; addi.d %1,%1,4 \n\t" \
    "vld $vr1,%0,0;"  SAVE1x4(1) "vld $vr2,%0,16;" SAVE1x4(2) \
    "vld $vr1,%0,32;" SAVE1x4(1) "vld $vr2,%0,48;" SAVE1x4(2) \
    "add.d %0,%0,%2 \n\t"
#define COPY_1x8 \
    "move %4,%1; addi.d %1,%1,4 \n\t" \
    "vld $vr1,%0,0;" SAVE1x4(1) "vld $vr2,%0,16;" SAVE1x4(2) \
    "add.d %0,%0,%2 \n\t"
#define COPY_1x4 \
    "move %4,%1; addi.d %1,%1,4 \n\t" \
    "vld $vr1,%0,0;" SAVE1x4(1) \
    "add.d %0,%0,%2 \n\t"
#define COPY_1x2 \
    "move %4,%1;fld.d $f1,%0,0;add.d %0,%0,%2;vfmul.s $vr1,$vr1,$vr15;vstelm.w $vr1,%4,0,0;add.d %4,%4,%3;vstelm.w $vr1,%4,0,1;\n\t" \
    "addi.d %1,%1,4;\n\t"
#define COPY_1x1 \
    "fld.s $f1,%0,0;fmul.s $f1,$f1,$f15;fst.s $f1,%1,0;add.d %0,%0,%2;addi.d %1,%1,4;\n\t"

#define ROWS_OF_BLOCK 128

#define COMPUTE(ndim) \
    src = src_base; dst = dst_base; \
    __asm__ __volatile__( \
    "xvldrepl.w $xr15,   %6,    0    \n\t" \
    "srli.d     $r6,     %5,    2    \n\t" \
    "beqz       $r6,     "#ndim"3f   \n\t" \
    #ndim"4: \n\t" \
    COPY_4x##ndim  \
    "addi.d     $r6,     $r6,   -1   \n\t" \
    "bnez       $r6,     "#ndim"4b   \n\t" \
    #ndim"3: \n\t" \
    "andi       $r6,     %5,    2    \n\t" \
    "beqz       $r6,     "#ndim"1f   \n\t" \
    #ndim"2: \n\t" \
    COPY_2x##ndim  \
    #ndim"1: \n\t" \
    "andi       $r6,     %5,    1    \n\t" \
    "beqz       $r6,     "#ndim"0f   \n\t" \
    COPY_1x##ndim  \
    #ndim"0: \n\t" \
    :"+r"(src),"+r"(dst),"+r"(src_ld_bytes),"+r"(dst_ld_bytes),"+r"(dst_tmp) \
    :"r"(num_cols),"r"(&ALPHA) \
    :"memory", "$r6", "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", "$f9", "$f10", "$f11", "$f15" \
    );

int CNAME(BLASLONG rows, BLASLONG cols, FLOAT alpha, FLOAT *a, BLASLONG lda, FLOAT *b, BLASLONG ldb){
  float *src, *dst, *dst_tmp=0, *src_base, *dst_base;
  uint64_t src_ld_bytes = (uint64_t)lda * sizeof(float), dst_ld_bytes = (uint64_t)ldb * sizeof(float), num_cols = 0;
  BLASLONG rows_left, cols_done; float ALPHA = alpha;
  if (ALPHA == 0.0) {
    dst_base = b;
    for (rows_left = rows; rows_left > 0; rows_left--) {memset(dst_base, 0, cols * sizeof(float)); dst_base += ldb;}
    return 0;
  }
  for (cols_done = 0; cols_done < cols; cols_done += num_cols) {
    num_cols = cols - cols_done;
    if (num_cols > ROWS_OF_BLOCK) num_cols = ROWS_OF_BLOCK;
    rows_left = rows; src_base = a + (int64_t)lda * (int64_t)cols_done; dst_base = b + cols_done;
    for (;rows_left > 15; rows_left -= 16) {COMPUTE(16) src_base += 16; dst_base += 16 * ldb;}
    for (;rows_left > 7; rows_left -= 8) {COMPUTE(8) src_base += 8; dst_base += 8 * ldb;}
    for (;rows_left > 3; rows_left -= 4) {COMPUTE(4) src_base += 4; dst_base += 4 * ldb;}
    for (;rows_left > 1; rows_left -= 2) {COMPUTE(2) src_base += 2; dst_base += 2 * ldb;}
    if (rows_left > 0) {COMPUTE(1) src_base ++; dst_base += ldb;}
  }
}