From 3642ca4d465f347188e155aab4464b6e814855cb Mon Sep 17 00:00:00 2001
From: Chen-Pang He <jdh8@ms63.hinet.net>
Date: Sun, 9 Sep 2012 23:34:45 +0800
Subject: Implement packed triangular matrix-vector product.

---
 blas/level2_impl.h | 66 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 61 insertions(+), 5 deletions(-)

(limited to 'blas/level2_impl.h')

diff --git a/blas/level2_impl.h b/blas/level2_impl.h
index f1f7371ee..997ad016f 100644
--- a/blas/level2_impl.h
+++ b/blas/level2_impl.h
@@ -187,7 +187,7 @@ int EIGEN_BLAS_FUNC(trmv)(char *uplo, char *opa, char *diag, int *n, RealScalar
   copy_back(res.data(),b,*n,*incb);
   if(actual_b!=b) delete[] actual_b;
 
-  return 0;
+  return 1;
 }
 
 /**  GBMV  performs one of the matrix-vector operations
@@ -399,10 +399,66 @@ int EIGEN_BLAS_FUNC(tbsv)(char *uplo, char *op, char *diag, int *n, int *k, Real
   *  where x is an n element vector and  A is an n by n unit, or non-unit,
   *  upper or lower triangular matrix, supplied in packed form.
   */
-// int EIGEN_BLAS_FUNC(tpmv)(char *uplo, char *trans, char *diag, int *n, RealScalar *ap, RealScalar *x, int *incx)
-// {
-//   return 1;
-// }
+int EIGEN_BLAS_FUNC(tpmv)(char *uplo, char *opa, char *diag, int *n, RealScalar *pap, RealScalar *px, int *incx)
+{
+  typedef void (*functype)(int, const Scalar*, const Scalar*, Scalar*, Scalar);
+  static functype func[16];
+
+  static bool init = false;
+  if(!init)
+  {
+    for(int k=0; k<16; ++k)
+      func[k] = 0;
+
+    func[NOTR  | (UP << 2) | (NUNIT << 3)] = (internal::packed_triangular_matrix_vector_product<int,Upper|0,       Scalar,false,Scalar,false,ColMajor>::run);
+    func[TR    | (UP << 2) | (NUNIT << 3)] = (internal::packed_triangular_matrix_vector_product<int,Lower|0,       Scalar,false,Scalar,false,RowMajor>::run);
+    func[ADJ   | (UP << 2) | (NUNIT << 3)] = (internal::packed_triangular_matrix_vector_product<int,Lower|0,       Scalar,Conj, Scalar,false,RowMajor>::run);
+
+    func[NOTR  | (LO << 2) | (NUNIT << 3)] = (internal::packed_triangular_matrix_vector_product<int,Lower|0,       Scalar,false,Scalar,false,ColMajor>::run);
+    func[TR    | (LO << 2) | (NUNIT << 3)] = (internal::packed_triangular_matrix_vector_product<int,Upper|0,       Scalar,false,Scalar,false,RowMajor>::run);
+    func[ADJ   | (LO << 2) | (NUNIT << 3)] = (internal::packed_triangular_matrix_vector_product<int,Upper|0,       Scalar,Conj, Scalar,false,RowMajor>::run);
+
+    func[NOTR  | (UP << 2) | (UNIT  << 3)] = (internal::packed_triangular_matrix_vector_product<int,Upper|UnitDiag,Scalar,false,Scalar,false,ColMajor>::run);
+    func[TR    | (UP << 2) | (UNIT  << 3)] = (internal::packed_triangular_matrix_vector_product<int,Lower|UnitDiag,Scalar,false,Scalar,false,RowMajor>::run);
+    func[ADJ   | (UP << 2) | (UNIT  << 3)] = (internal::packed_triangular_matrix_vector_product<int,Lower|UnitDiag,Scalar,Conj, Scalar,false,RowMajor>::run);
+
+    func[NOTR  | (LO << 2) | (UNIT  << 3)] = (internal::packed_triangular_matrix_vector_product<int,Lower|UnitDiag,Scalar,false,Scalar,false,ColMajor>::run);
+    func[TR    | (LO << 2) | (UNIT  << 3)] = (internal::packed_triangular_matrix_vector_product<int,Upper|UnitDiag,Scalar,false,Scalar,false,RowMajor>::run);
+    func[ADJ   | (LO << 2) | (UNIT  << 3)] = (internal::packed_triangular_matrix_vector_product<int,Upper|UnitDiag,Scalar,Conj, Scalar,false,RowMajor>::run);
+
+    init = true;
+  }
+
+  Scalar* ap = reinterpret_cast<Scalar*>(pap);
+  Scalar* x = reinterpret_cast<Scalar*>(px);
+
+  int info = 0;
+  if(UPLO(*uplo)==INVALID)                                            info = 1;
+  else if(OP(*opa)==INVALID)                                          info = 2;
+  else if(DIAG(*diag)==INVALID)                                       info = 3;
+  else if(*n<0)                                                       info = 4;
+  else if(*incx==0)                                                   info = 7;
+  if(info)
+    return xerbla_(SCALAR_SUFFIX_UP"TPMV ",&info,6);
+
+  if(*n==0)
+    return 1;
+
+  Scalar* actual_x = get_compact_vector(x,*n,*incx);
+  Matrix<Scalar,Dynamic,1> res(*n);
+  res.setZero();
+
+  int code = OP(*opa) | (UPLO(*uplo) << 2) | (DIAG(*diag) << 3);
+  if(code>=16 || func[code]==0)
+    return 0;
+
+  func[code](*n, ap, actual_x, res.data(), Scalar(1));
+
+  copy_back(res.data(),x,*n,*incx);
+  if(actual_x!=x) delete[] actual_x;
+
+  return 1;
+}
 
 /**  DTPSV  solves one of the systems of equations
   *
-- 
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