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- /* blas/source_herk.h
- *
- * Copyright (C) 2001, 2007 Brian Gough
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- {
- INDEX i, j, k;
- int uplo, trans;
- if (beta == 1.0 && (alpha == 0.0 || K == 0))
- return;
- if (Order == CblasRowMajor) {
- uplo = Uplo;
- trans = Trans;
- } else {
- uplo = (Uplo == CblasUpper) ? CblasLower : CblasUpper;
- trans = (Trans == CblasNoTrans) ? CblasConjTrans : CblasNoTrans;
- }
- /* form y := beta*y */
- if (beta == 0.0) {
- if (uplo == CblasUpper) {
- for (i = 0; i < N; i++) {
- for (j = i; j < N; j++) {
- REAL(C, ldc * i + j) = 0.0;
- IMAG(C, ldc * i + j) = 0.0;
- }
- }
- } else {
- for (i = 0; i < N; i++) {
- for (j = 0; j <= i; j++) {
- REAL(C, ldc * i + j) = 0.0;
- IMAG(C, ldc * i + j) = 0.0;
- }
- }
- }
- } else if (beta != 1.0) {
- if (uplo == CblasUpper) {
- for (i = 0; i < N; i++) {
- REAL(C, ldc * i + i) *= beta;
- IMAG(C, ldc * i + i) = 0;
- for (j = i + 1; j < N; j++) {
- REAL(C, ldc * i + j) *= beta;
- IMAG(C, ldc * i + j) *= beta;
- }
- }
- } else {
- for (i = 0; i < N; i++) {
- for (j = 0; j < i; j++) {
- REAL(C, ldc * i + j) *= beta;
- IMAG(C, ldc * i + j) *= beta;
- }
- REAL(C, ldc * i + i) *= beta;
- IMAG(C, ldc * i + i) = 0;
- }
- }
- } else {
- /* set imaginary part of Aii to zero */
- for (i = 0; i < N; i++) {
- IMAG(C, ldc * i + i) = 0.0;
- }
- }
- if (alpha == 0.0)
- return;
- if (uplo == CblasUpper && trans == CblasNoTrans) {
- for (i = 0; i < N; i++) {
- for (j = i; j < N; j++) {
- BASE temp_real = 0.0;
- BASE temp_imag = 0.0;
- for (k = 0; k < K; k++) {
- const BASE Aik_real = CONST_REAL(A, i * lda + k);
- const BASE Aik_imag = CONST_IMAG(A, i * lda + k);
- const BASE Ajk_real = CONST_REAL(A, j * lda + k);
- const BASE Ajk_imag = -CONST_IMAG(A, j * lda + k);
- temp_real += Aik_real * Ajk_real - Aik_imag * Ajk_imag;
- temp_imag += Aik_real * Ajk_imag + Aik_imag * Ajk_real;
- }
- REAL(C, i * ldc + j) += alpha * temp_real;
- IMAG(C, i * ldc + j) += alpha * temp_imag;
- }
- }
- } else if (uplo == CblasUpper && trans == CblasConjTrans) {
- for (i = 0; i < N; i++) {
- for (j = i; j < N; j++) {
- BASE temp_real = 0.0;
- BASE temp_imag = 0.0;
- for (k = 0; k < K; k++) {
- const BASE Aki_real = CONST_REAL(A, k * lda + i);
- const BASE Aki_imag = -CONST_IMAG(A, k * lda + i);
- const BASE Akj_real = CONST_REAL(A, k * lda + j);
- const BASE Akj_imag = CONST_IMAG(A, k * lda + j);
- temp_real += Aki_real * Akj_real - Aki_imag * Akj_imag;
- temp_imag += Aki_real * Akj_imag + Aki_imag * Akj_real;
- }
- REAL(C, i * ldc + j) += alpha * temp_real;
- IMAG(C, i * ldc + j) += alpha * temp_imag;
- }
- }
- } else if (uplo == CblasLower && trans == CblasNoTrans) {
- for (i = 0; i < N; i++) {
- for (j = 0; j <= i; j++) {
- BASE temp_real = 0.0;
- BASE temp_imag = 0.0;
- for (k = 0; k < K; k++) {
- const BASE Aik_real = CONST_REAL(A, i * lda + k);
- const BASE Aik_imag = CONST_IMAG(A, i * lda + k);
- const BASE Ajk_real = CONST_REAL(A, j * lda + k);
- const BASE Ajk_imag = -CONST_IMAG(A, j * lda + k);
- temp_real += Aik_real * Ajk_real - Aik_imag * Ajk_imag;
- temp_imag += Aik_real * Ajk_imag + Aik_imag * Ajk_real;
- }
- REAL(C, i * ldc + j) += alpha * temp_real;
- IMAG(C, i * ldc + j) += alpha * temp_imag;
- }
- }
- } else if (uplo == CblasLower && trans == CblasConjTrans) {
- for (i = 0; i < N; i++) {
- for (j = 0; j <= i; j++) {
- BASE temp_real = 0.0;
- BASE temp_imag = 0.0;
- for (k = 0; k < K; k++) {
- const BASE Aki_real = CONST_REAL(A, k * lda + i);
- const BASE Aki_imag = -CONST_IMAG(A, k * lda + i);
- const BASE Akj_real = CONST_REAL(A, k * lda + j);
- const BASE Akj_imag = CONST_IMAG(A, k * lda + j);
- temp_real += Aki_real * Akj_real - Aki_imag * Akj_imag;
- temp_imag += Aki_real * Akj_imag + Aki_imag * Akj_real;
- }
- REAL(C, i * ldc + j) += alpha * temp_real;
- IMAG(C, i * ldc + j) += alpha * temp_imag;
- }
- }
- } else {
- BLAS_ERROR("unrecognized operation");
- }
- }
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