1 /* blas/source_gemv_c.h 2 * 3 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 3 of the License, or (at 8 * your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 18 */ 19 20 { 21 INDEX i, j; 22 INDEX lenX, lenY; 23 24 const BASE alpha_real = CONST_REAL0(alpha); 25 const BASE alpha_imag = CONST_IMAG0(alpha); 26 27 const BASE beta_real = CONST_REAL0(beta); 28 const BASE beta_imag = CONST_IMAG0(beta); 29 30 if (M == 0 || N == 0) 31 return; 32 33 if ((alpha_real == 0.0 && alpha_imag == 0.0) 34 && (beta_real == 1.0 && beta_imag == 0.0)) 35 return; 36 37 if (TransA == CblasNoTrans) { 38 lenX = N; 39 lenY = M; 40 } else { 41 lenX = M; 42 lenY = N; 43 } 44 45 /* form y := beta*y */ 46 47 if (beta_real == 0.0 && beta_imag == 0.0) { 48 INDEX iy = OFFSET(lenY, incY); 49 for (i = 0; i < lenY; i++) { 50 REAL(Y, iy) = 0.0; 51 IMAG(Y, iy) = 0.0; 52 iy += incY; 53 } 54 } else if (!(beta_real == 1.0 && beta_imag == 0.0)) { 55 INDEX iy = OFFSET(lenY, incY); 56 for (i = 0; i < lenY; i++) { 57 const BASE y_real = REAL(Y, iy); 58 const BASE y_imag = IMAG(Y, iy); 59 const BASE tmpR = y_real * beta_real - y_imag * beta_imag; 60 const BASE tmpI = y_real * beta_imag + y_imag * beta_real; 61 REAL(Y, iy) = tmpR; 62 IMAG(Y, iy) = tmpI; 63 iy += incY; 64 } 65 } 66 67 if (alpha_real == 0.0 && alpha_imag == 0.0) 68 return; 69 70 if ((order == CblasRowMajor && TransA == CblasNoTrans) 71 || (order == CblasColMajor && TransA == CblasTrans)) { 72 /* form y := alpha*A*x + y */ 73 INDEX iy = OFFSET(lenY, incY); 74 for (i = 0; i < lenY; i++) { 75 BASE dotR = 0.0; 76 BASE dotI = 0.0; 77 INDEX ix = OFFSET(lenX, incX); 78 for (j = 0; j < lenX; j++) { 79 const BASE x_real = CONST_REAL(X, ix); 80 const BASE x_imag = CONST_IMAG(X, ix); 81 const BASE A_real = CONST_REAL(A, lda * i + j); 82 const BASE A_imag = CONST_IMAG(A, lda * i + j); 83 84 dotR += A_real * x_real - A_imag * x_imag; 85 dotI += A_real * x_imag + A_imag * x_real; 86 ix += incX; 87 } 88 89 REAL(Y, iy) += alpha_real * dotR - alpha_imag * dotI; 90 IMAG(Y, iy) += alpha_real * dotI + alpha_imag * dotR; 91 iy += incY; 92 } 93 } else if ((order == CblasRowMajor && TransA == CblasTrans) 94 || (order == CblasColMajor && TransA == CblasNoTrans)) { 95 /* form y := alpha*A'*x + y */ 96 INDEX ix = OFFSET(lenX, incX); 97 for (j = 0; j < lenX; j++) { 98 BASE x_real = CONST_REAL(X, ix); 99 BASE x_imag = CONST_IMAG(X, ix); 100 BASE tmpR = alpha_real * x_real - alpha_imag * x_imag; 101 BASE tmpI = alpha_real * x_imag + alpha_imag * x_real; 102 103 INDEX iy = OFFSET(lenY, incY); 104 for (i = 0; i < lenY; i++) { 105 const BASE A_real = CONST_REAL(A, lda * j + i); 106 const BASE A_imag = CONST_IMAG(A, lda * j + i); 107 REAL(Y, iy) += A_real * tmpR - A_imag * tmpI; 108 IMAG(Y, iy) += A_real * tmpI + A_imag * tmpR; 109 iy += incY; 110 } 111 ix += incX; 112 } 113 } else if (order == CblasRowMajor && TransA == CblasConjTrans) { 114 /* form y := alpha*A^H*x + y */ 115 INDEX ix = OFFSET(lenX, incX); 116 for (j = 0; j < lenX; j++) { 117 BASE x_real = CONST_REAL(X, ix); 118 BASE x_imag = CONST_IMAG(X, ix); 119 BASE tmpR = alpha_real * x_real - alpha_imag * x_imag; 120 BASE tmpI = alpha_real * x_imag + alpha_imag * x_real; 121 122 INDEX iy = OFFSET(lenY, incY); 123 for (i = 0; i < lenY; i++) { 124 const BASE A_real = CONST_REAL(A, lda * j + i); 125 const BASE A_imag = CONST_IMAG(A, lda * j + i); 126 REAL(Y, iy) += A_real * tmpR - (-A_imag) * tmpI; 127 IMAG(Y, iy) += A_real * tmpI + (-A_imag) * tmpR; 128 iy += incY; 129 } 130 ix += incX; 131 } 132 } else if (order == CblasColMajor && TransA == CblasConjTrans) { 133 /* form y := alpha*A^H*x + y */ 134 INDEX iy = OFFSET(lenY, incY); 135 for (i = 0; i < lenY; i++) { 136 BASE dotR = 0.0; 137 BASE dotI = 0.0; 138 INDEX ix = OFFSET(lenX, incX); 139 for (j = 0; j < lenX; j++) { 140 const BASE x_real = CONST_REAL(X, ix); 141 const BASE x_imag = CONST_IMAG(X, ix); 142 const BASE A_real = CONST_REAL(A, lda * i + j); 143 const BASE A_imag = CONST_IMAG(A, lda * i + j); 144 145 dotR += A_real * x_real - (-A_imag) * x_imag; 146 dotI += A_real * x_imag + (-A_imag) * x_real; 147 ix += incX; 148 } 149 150 REAL(Y, iy) += alpha_real * dotR - alpha_imag * dotI; 151 IMAG(Y, iy) += alpha_real * dotI + alpha_imag * dotR; 152 iy += incY; 153 } 154 } else { 155 BLAS_ERROR("unrecognized operation"); 156 } 157 158 } 159