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/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/* without modification, are permitted provided that the following   */
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/*   2. Redistributions in binary form must reproduce the above      */
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/*********************************************************************/

#include <stdio.h>
#include "common.h"
#ifdef FUNCTION_PROFILE
#include "functable.h"
#endif

#ifdef XDOUBLE
#define ERROR_NAME "XGEMV "
#elif defined(DOUBLE)
#define ERROR_NAME "ZGEMV "
#else
#define ERROR_NAME "CGEMV "
#endif

#ifdef SMP
static int (*gemv_thread[])(BLASLONG, BLASLONG, FLOAT *, FLOAT *, BLASLONG,  FLOAT * , BLASLONG, FLOAT *, BLASLONG, FLOAT *, int) = {
#ifdef XDOUBLE
  xgemv_thread_n, xgemv_thread_t, xgemv_thread_r, xgemv_thread_c, xgemv_thread_o, xgemv_thread_u, xgemv_thread_s, xgemv_thread_d,
#elif defined DOUBLE
  zgemv_thread_n, zgemv_thread_t, zgemv_thread_r, zgemv_thread_c, zgemv_thread_o, zgemv_thread_u, zgemv_thread_s, zgemv_thread_d,
#else
  cgemv_thread_n, cgemv_thread_t, cgemv_thread_r, cgemv_thread_c, cgemv_thread_o, cgemv_thread_u, cgemv_thread_s, cgemv_thread_d,
#endif
};
#endif

#ifndef CBLAS

void NAME(char *TRANS, blasint *M, blasint *N,
	 FLOAT *ALPHA, FLOAT *a, blasint *LDA,
	 FLOAT *x, blasint *INCX,
	 FLOAT *BETA,  FLOAT *y, blasint *INCY){

  char trans = *TRANS;
  blasint m = *M;
  blasint n = *N;
  blasint lda = *LDA;
  blasint incx = *INCX;
  blasint incy = *INCY;

  FLOAT *buffer;
  int buffer_size;
#ifdef SMP
  int nthreads;
#endif

  int (*gemv[])(BLASLONG, BLASLONG, BLASLONG, FLOAT, FLOAT, FLOAT *, BLASLONG,
		FLOAT * , BLASLONG, FLOAT *, BLASLONG, FLOAT *) = {
		  GEMV_N, GEMV_T, GEMV_R, GEMV_C,
		  GEMV_O, GEMV_U, GEMV_S, GEMV_D,
		};

  blasint    info;
  blasint    lenx, leny;
  blasint    i;

  FLOAT alpha_r = *(ALPHA + 0);
  FLOAT alpha_i = *(ALPHA + 1);

  FLOAT beta_r  = *(BETA + 0);
  FLOAT beta_i  = *(BETA + 1);

  PRINT_DEBUG_NAME;

  TOUPPER(trans);

  info = 0;

  i    = -1;

  if (trans == 'N')  i = 0;
  if (trans == 'T')  i = 1;
  if (trans == 'R')  i = 2;
  if (trans == 'C')  i = 3;
  if (trans == 'O')  i = 4;
  if (trans == 'U')  i = 5;
  if (trans == 'S')  i = 6;
  if (trans == 'D')  i = 7;

  if (incy == 0)      info = 11;
  if (incx == 0)      info = 8;
  if (lda < MAX(1,m)) info = 6;
  if (n < 0) 	      info = 3;
  if (m < 0) 	      info = 2;
  if (i < 0)          info = 1;

  trans = i;

  if (info != 0) {
    BLASFUNC(xerbla)(ERROR_NAME, &info, sizeof(ERROR_NAME));
    return;
  }

#else

void CNAME(enum CBLAS_ORDER order,
	   enum CBLAS_TRANSPOSE TransA,
	   blasint m, blasint n,
	   FLOAT *ALPHA,
	   FLOAT  *a, blasint lda,
	   FLOAT  *x, blasint incx,
	   FLOAT *BETA,
	   FLOAT  *y, blasint incy){

  FLOAT *buffer;
  blasint    lenx, leny;
  int trans, buffer_size;
  blasint info, t;
#ifdef SMP
  int nthreads;
#endif

  int (*gemv[])(BLASLONG, BLASLONG, BLASLONG, FLOAT, FLOAT, FLOAT *, BLASLONG,
	    FLOAT * , BLASLONG, FLOAT *, BLASLONG, FLOAT *) = {
	      GEMV_N, GEMV_T, GEMV_R, GEMV_C,
	      GEMV_O, GEMV_U, GEMV_S, GEMV_D,
	    };

  FLOAT alpha_r = *(ALPHA + 0);
  FLOAT alpha_i = *(ALPHA + 1);

  FLOAT beta_r  = *(BETA + 0);
  FLOAT beta_i  = *(BETA + 1);

  PRINT_DEBUG_CNAME;

  trans = -1;
  info  =  0;

  if (order == CblasColMajor) {
    if (TransA == CblasNoTrans)     trans = 0;
    if (TransA == CblasTrans)       trans = 1;
    if (TransA == CblasConjNoTrans) trans = 2;
    if (TransA == CblasConjTrans)   trans = 3;

    info = -1;

    if (incy == 0)	  info = 11;
    if (incx == 0)	  info = 8;
    if (lda < MAX(1, m))  info = 6;
    if (n < 0)		  info = 3;
    if (m < 0)		  info = 2;
    if (trans < 0)        info = 1;

  }

  if (order == CblasRowMajor) {
    if (TransA == CblasNoTrans)     trans = 1;
    if (TransA == CblasTrans)       trans = 0;
    if (TransA == CblasConjNoTrans) trans = 3;
    if (TransA == CblasConjTrans)   trans = 2;

    info = -1;

    t = n;
    n = m;
    m = t;

    if (incy == 0)	  info = 11;
    if (incx == 0)	  info = 8;
    if (lda < MAX(1, m))  info = 6;
    if (n < 0)		  info = 3;
    if (m < 0)		  info = 2;
    if (trans < 0)        info = 1;

  }

  if (info >= 0) {
    BLASFUNC(xerbla)(ERROR_NAME, &info, sizeof(ERROR_NAME));
    return;
  }

#endif

  /*  Quick return if possible. */

  if (m == 0 || n == 0) return;

  lenx = n;
  leny = m;

  if (trans & 1) lenx = m;
  if (trans & 1) leny = n;

  if (beta_r != ONE || beta_i != ZERO) SCAL_K(leny, 0, 0, beta_r, beta_i, y, abs(incy), NULL, 0, NULL, 0);

  if (alpha_r == ZERO && alpha_i == ZERO) return;

  IDEBUG_START;

  FUNCTION_PROFILE_START();

  if (incx < 0) x -= (lenx - 1) * incx * 2;
  if (incy < 0) y -= (leny - 1) * incy * 2;

  buffer_size = 2 * (m + n) + 128 / sizeof(FLOAT);
#ifdef WINDOWS_ABI
  buffer_size += 160 / sizeof(FLOAT) ;
#endif
  // for alignment
  buffer_size = (buffer_size + 3) & ~3;
  STACK_ALLOC(buffer_size, FLOAT, buffer);

#if defined(ARCH_X86_64) && defined(MAX_STACK_ALLOC) && MAX_STACK_ALLOC > 0
  // cgemv_t.S return NaN if there are NaN or Inf in the buffer (see bug #746)
  if(trans && stack_alloc_size)
    memset(buffer, 0, MIN(BUFFER_SIZE, sizeof(FLOAT) * buffer_size));
#endif

#ifdef SMP

  if ( 1L * m * n < 1024L * GEMM_MULTITHREAD_THRESHOLD )
    nthreads = 1;
  else
    nthreads = num_cpu_avail(2);

  if (nthreads == 1) {
#endif

    (gemv[(int)trans])(m, n, 0, alpha_r, alpha_i, a, lda, x, incx, y, incy, buffer);

#ifdef SMP

  } else {

    (gemv_thread[(int)trans])(m, n, ALPHA, a, lda, x, incx, y, incy, buffer, nthreads);

  }
#endif

  STACK_FREE(buffer);

  FUNCTION_PROFILE_END(4, m * n + m + n,  2 * m * n);

  IDEBUG_END;

  return;
}