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annotate libcruft/blas/cgerc.f @ 7789:82be108cc558

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First attempt at single precision tyeps * * * corrections to qrupdate single precision routines * * * prefer demotion to single over promotion to double * * * Add single precision support to log2 function * * * Trivial PROJECT file update * * * Cache optimized hermitian/transpose methods * * * Add tests for tranpose/hermitian and ChangeLog entry for new transpose code
author David Bateman <dbateman@free.fr>
date Sun, 27 Apr 2008 22:34:17 +0200
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1 SUBROUTINE CGERC(M,N,ALPHA,X,INCX,Y,INCY,A,LDA)
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2 * .. Scalar Arguments ..
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3 COMPLEX ALPHA
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4 INTEGER INCX,INCY,LDA,M,N
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5 * ..
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6 * .. Array Arguments ..
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7 COMPLEX A(LDA,*),X(*),Y(*)
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8 * ..
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9 *
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10 * Purpose
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11 * =======
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12 *
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13 * CGERC performs the rank 1 operation
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14 *
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15 * A := alpha*x*conjg( y' ) + A,
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16 *
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17 * where alpha is a scalar, x is an m element vector, y is an n element
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18 * vector and A is an m by n matrix.
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19 *
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20 * Arguments
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21 * ==========
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22 *
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23 * M - INTEGER.
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24 * On entry, M specifies the number of rows of the matrix A.
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25 * M must be at least zero.
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26 * Unchanged on exit.
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27 *
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28 * N - INTEGER.
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29 * On entry, N specifies the number of columns of the matrix A.
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30 * N must be at least zero.
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31 * Unchanged on exit.
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32 *
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33 * ALPHA - COMPLEX .
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34 * On entry, ALPHA specifies the scalar alpha.
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35 * Unchanged on exit.
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36 *
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37 * X - COMPLEX array of dimension at least
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38 * ( 1 + ( m - 1 )*abs( INCX ) ).
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39 * Before entry, the incremented array X must contain the m
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40 * element vector x.
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41 * Unchanged on exit.
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42 *
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43 * INCX - INTEGER.
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44 * On entry, INCX specifies the increment for the elements of
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45 * X. INCX must not be zero.
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46 * Unchanged on exit.
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47 *
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48 * Y - COMPLEX array of dimension at least
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49 * ( 1 + ( n - 1 )*abs( INCY ) ).
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50 * Before entry, the incremented array Y must contain the n
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51 * element vector y.
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52 * Unchanged on exit.
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53 *
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54 * INCY - INTEGER.
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55 * On entry, INCY specifies the increment for the elements of
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56 * Y. INCY must not be zero.
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57 * Unchanged on exit.
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58 *
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59 * A - COMPLEX array of DIMENSION ( LDA, n ).
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60 * Before entry, the leading m by n part of the array A must
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61 * contain the matrix of coefficients. On exit, A is
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62 * overwritten by the updated matrix.
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63 *
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64 * LDA - INTEGER.
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65 * On entry, LDA specifies the first dimension of A as declared
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66 * in the calling (sub) program. LDA must be at least
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67 * max( 1, m ).
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68 * Unchanged on exit.
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69 *
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70 *
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71 * Level 2 Blas routine.
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72 *
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73 * -- Written on 22-October-1986.
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74 * Jack Dongarra, Argonne National Lab.
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75 * Jeremy Du Croz, Nag Central Office.
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76 * Sven Hammarling, Nag Central Office.
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77 * Richard Hanson, Sandia National Labs.
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78 *
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79 *
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80 * .. Parameters ..
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81 COMPLEX ZERO
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82 PARAMETER (ZERO= (0.0E+0,0.0E+0))
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83 * ..
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84 * .. Local Scalars ..
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85 COMPLEX TEMP
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86 INTEGER I,INFO,IX,J,JY,KX
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87 * ..
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88 * .. External Subroutines ..
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89 EXTERNAL XERBLA
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90 * ..
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91 * .. Intrinsic Functions ..
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92 INTRINSIC CONJG,MAX
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93 * ..
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94 *
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95 * Test the input parameters.
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96 *
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97 INFO = 0
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98 IF (M.LT.0) THEN
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99 INFO = 1
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100 ELSE IF (N.LT.0) THEN
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101 INFO = 2
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102 ELSE IF (INCX.EQ.0) THEN
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103 INFO = 5
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104 ELSE IF (INCY.EQ.0) THEN
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105 INFO = 7
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106 ELSE IF (LDA.LT.MAX(1,M)) THEN
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107 INFO = 9
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108 END IF
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109 IF (INFO.NE.0) THEN
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110 CALL XERBLA('CGERC ',INFO)
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111 RETURN
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112 END IF
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113 *
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114 * Quick return if possible.
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115 *
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116 IF ((M.EQ.0) .OR. (N.EQ.0) .OR. (ALPHA.EQ.ZERO)) RETURN
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117 *
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118 * Start the operations. In this version the elements of A are
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119 * accessed sequentially with one pass through A.
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120 *
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121 IF (INCY.GT.0) THEN
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122 JY = 1
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123 ELSE
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124 JY = 1 - (N-1)*INCY
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125 END IF
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126 IF (INCX.EQ.1) THEN
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127 DO 20 J = 1,N
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128 IF (Y(JY).NE.ZERO) THEN
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129 TEMP = ALPHA*CONJG(Y(JY))
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130 DO 10 I = 1,M
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131 A(I,J) = A(I,J) + X(I)*TEMP
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132 10 CONTINUE
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133 END IF
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134 JY = JY + INCY
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135 20 CONTINUE
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136 ELSE
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137 IF (INCX.GT.0) THEN
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138 KX = 1
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139 ELSE
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140 KX = 1 - (M-1)*INCX
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141 END IF
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142 DO 40 J = 1,N
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143 IF (Y(JY).NE.ZERO) THEN
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144 TEMP = ALPHA*CONJG(Y(JY))
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145 IX = KX
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146 DO 30 I = 1,M
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147 A(I,J) = A(I,J) + X(IX)*TEMP
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148 IX = IX + INCX
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149 30 CONTINUE
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150 END IF
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151 JY = JY + INCY
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152 40 CONTINUE
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153 END IF
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154 *
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155 RETURN
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156 *
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157 * End of CGERC .
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158 *
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159 END