OpenBLAS/lapack/getrf/getrf_single.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/*********************************************************************/

#include <stdio.h>
#include "common.h"

#define GEMM_PQ  MAX(GEMM_P, GEMM_Q)
#define REAL_GEMM_R (GEMM_R - GEMM_PQ)

static FLOAT dm1 = -1.;

blasint CNAME(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n, FLOAT *sa, FLOAT *sb, BLASLONG myid) {

  BLASLONG m, n, lda, offset;
  BLASLONG j, js, jmin, is, imin, jc, jcmin;
  BLASLONG jjs, min_jj;
  blasint *ipiv, iinfo, info;
  BLASLONG jb, mn, blocking;
  FLOAT *a, *offsetA, *offsetB;
  BLASLONG range_N[2];

  FLOAT *sbb;

  m    = args -> m;
  n    = args -> n;
  a    = (FLOAT *)args -> a;
  lda  = args -> lda;
  ipiv = (blasint *)args -> c;
  offset = 0;

  if (range_n) {
    m     -= range_n[0];
    n      = range_n[1] - range_n[0];
    offset = range_n[0];
    a     += range_n[0] * (lda + 1) * COMPSIZE;
  }

  if (m <= 0 || n <= 0) return 0;
  
  mn = MIN(m, n);

  blocking = (mn / 2 + GEMM_UNROLL_N - 1) & ~(GEMM_UNROLL_N - 1);
  if (blocking > GEMM_Q) blocking = GEMM_Q;

  if (blocking <= GEMM_UNROLL_N * 2) {
    info = GETF2(args, NULL, range_n, sa, sb, 0);
    return info;
  }
  
  sbb = (FLOAT *)((((long)(sb + blocking * blocking * COMPSIZE) + GEMM_ALIGN) & ~GEMM_ALIGN) + GEMM_OFFSET_B);

  info = 0;

  for (j = 0; j < mn; j += blocking) {
    
    jb = mn - j;
    if (jb > blocking) jb = blocking;

    offsetA = a +  j       * lda * COMPSIZE;
    offsetB = a + (j + jb) * lda * COMPSIZE;

    range_N[0] = offset + j;
    range_N[1] = offset + j + jb;

    iinfo   = CNAME(args, NULL, range_N, sa, sb, 0);

    if (iinfo && !info) info = iinfo + j;

    if (j + jb < n) {
      
      TRSM_ILTCOPY(jb, jb, offsetA + j * COMPSIZE, lda, 0, sb);
      
      for (js = j + jb; js < n; js += REAL_GEMM_R){
	jmin = n - js;
	if (jmin > REAL_GEMM_R) jmin = REAL_GEMM_R;
	
	  for (jjs = js; jjs < js + jmin; jjs += GEMM_UNROLL_N){
	    min_jj = js + jmin - jjs;
	    if (min_jj > GEMM_UNROLL_N) min_jj = GEMM_UNROLL_N;
	    
#if 1 
	    LASWP_PLUS(min_jj, j + offset + 1, j + jb + offset, ZERO, 
#ifdef COMPLEX
		       ZERO,
#endif
		       a + (- offset + jjs * lda) * COMPSIZE, lda, NULL, 0 , ipiv, 1);
	    
	    GEMM_ONCOPY (jb, min_jj, a + (j + jjs * lda) * COMPSIZE, lda, sbb + jb * (jjs - js) * COMPSIZE);
#else
	    LASWP_NCOPY(min_jj, j + offset + 1, j + jb + offset, 
			a + (- offset + jjs * lda) * COMPSIZE, lda, ipiv, sbb + jb * (jjs - js) * COMPSIZE);
#endif
	    
	    
	    for (jc = 0; jc < jb; jc += GEMM_P) {
	      jcmin = jb - jc;
	      if (jcmin > GEMM_P) jcmin = GEMM_P;
	      
	      TRSM_KERNEL_LT(jcmin, min_jj, jb, dm1,
#ifdef COMPLEX
			     ZERO,
#endif
			     sb  + jb * jc * COMPSIZE,
			     sbb + jb * (jjs - js) * COMPSIZE, 
			     a + (j + jc + jjs * lda) * COMPSIZE, lda, jc);
	    }
	  }


	for (is = j + jb; is < m; is += GEMM_P){
	  
	  imin = m - is;
	  if (imin > GEMM_P) imin = GEMM_P;

	  GEMM_ITCOPY (jb, imin, offsetA + is * COMPSIZE, lda, sa);
	  
	  GEMM_KERNEL_N(imin, jmin, jb, dm1,
#ifdef COMPLEX
			ZERO,
#endif
			sa, sbb, 	a + (is + js * lda) * COMPSIZE, lda);
	}
      }
    }
  }
  
  for (j = 0; j < mn; j += jb) {
    jb = MIN(mn - j, blocking);
    LASWP_PLUS(jb, j + jb + offset + 1, mn + offset, ZERO,
#ifdef COMPLEX
	       ZERO,
#endif
	       a - (offset - j * lda) * COMPSIZE, lda, NULL, 0 , ipiv, 1);
    
  }

  return info;
}