001: /*
002:  * cblas_cgemv.c
003:  * The program is a C interface of cgemv
004:  *
005:  * Keita Teranishi  5/20/98
006:  *
007:  */
008: #include <stdio.h>
009: #include <stdlib.h>
010: #include "cblas.h"
011: #include "cblas_f77.h"
012: void cblas_cgemv(const enum CBLAS_ORDER order,
013:                  const enum CBLAS_TRANSPOSE TransA, const int M, const int N,
014:                  const void *alpha, const void  *A, const int lda,
015:                  const void  *X, const int incX, const void *beta,
016:                  void  *Y, const int incY)
017: {
018:    char TA;
019: #ifdef F77_CHAR
020:    F77_CHAR F77_TA;
021: #else
022:    #define F77_TA &TA
023: #endif
024: #ifdef F77_INT
025:    F77_INT F77_M=M, F77_N=N, F77_lda=lda, F77_incX=incX, F77_incY=incY;
026: #else
027:    #define F77_M M
028:    #define F77_N N
029:    #define F77_lda lda
030:    #define F77_incX incx
031:    #define F77_incY incY
032: #endif
033: 
034:    int n=0, i=0, incx=incX;
035:    const float *xx= (const float *)X;
036:    float ALPHA[2],BETA[2];
037:    int tincY, tincx;
038:    float *x=(float *)X, *y=(float *)Y, *st=0, *tx=0;
039:    const float *stx = x;
040:    extern int CBLAS_CallFromC;
041:    extern int RowMajorStrg;
042:    RowMajorStrg = 0;
043: 
044:    CBLAS_CallFromC = 1;
045: 
046:    if (order == CblasColMajor)
047:    {
048:       if (TransA == CblasNoTrans) TA = 'N';
049:       else if (TransA == CblasTrans) TA = 'T';
050:       else if (TransA == CblasConjTrans) TA = 'C';
051:       else
052:       {
053:          cblas_xerbla(2, "cblas_cgemv","Illegal TransA setting, %d\n", TransA);
054:          CBLAS_CallFromC = 0;
055:          RowMajorStrg = 0;
056:          return;
057:       }
058:       #ifdef F77_CHAR
059:          F77_TA = C2F_CHAR(&TA);
060:       #endif
061:       F77_cgemv(F77_TA, &F77_M, &F77_N, alpha, A, &F77_lda, X, &F77_incX,
062:                 beta, Y, &F77_incY);
063:    }
064:    else if (order == CblasRowMajor)
065:    {
066:       RowMajorStrg = 1;
067: 
068:       if (TransA == CblasNoTrans) TA = 'T';
069:       else if (TransA == CblasTrans) TA = 'N';
070:       else if (TransA == CblasConjTrans)
071:       {
072:          ALPHA[0]=    *( (const float *)  alpha    );
073:          ALPHA[1]= -( *( (const float *)  alpha+1) );
074:          BETA[0]=     *( (const float *)  beta     );
075:          BETA[1]= -(  *( (const float *)  beta+1 ) );
076:          TA = 'N';
077:          if (M > 0)
078:          {
079:             n = M << 1;
080:             x = (float *)malloc(n*sizeof(float));
081:             tx = x;
082:             if( incX > 0 ) {
083:                i = incX << 1 ;
084:                tincx = 2;
085:                st= x+n;
086:             } else {
087:                i = incX *(-2);
088:                tincx = -2;
089:                st = x-2;
090:                x +=(n-2);
091:             }
092: 
093:             do
094:             {
095:                *x = *xx;
096:                x[1] = -xx[1];
097:                x += tincx ;
098:                xx += i;
099:             }
100:             while (x != st);
101:             x=tx;
102: 
103:             F77_incX = 1;
104: 
105:             if(incY > 0)
106:                tincY = incY;
107:             else
108:                tincY = -incY;
109: 
110:             y++;
111: 
112:             if (N > 0)
113:             {
114:                i = tincY << 1;
115:                n = i * N ;
116:                st = y + n;
117:                do {
118:                   *y = -(*y);
119:                   y += i;
120:                } while(y != st);
121:                y -= n;
122:             }
123:             stx = x;
124:          }
125:          else stx = (const float *)X;
126:       }
127:       else
128:       {
129:          cblas_xerbla(2, "cblas_cgemv","Illegal TransA setting, %d\n", TransA);
130:          CBLAS_CallFromC = 0;
131:          RowMajorStrg = 0;
132:          return;
133:       }
134:       #ifdef F77_CHAR
135:          F77_TA = C2F_CHAR(&TA);
136:       #endif
137:       if (TransA == CblasConjTrans)
138:          F77_cgemv(F77_TA, &F77_N, &F77_M, ALPHA, A, &F77_lda, stx,
139:                 &F77_incX, BETA, Y, &F77_incY);
140:       else
141:          F77_cgemv(F77_TA, &F77_N, &F77_M, alpha, A, &F77_lda, x,
142:                 &F77_incX, beta, Y, &F77_incY);
143: 
144:       if (TransA == CblasConjTrans)
145:       {
146:          if (x != (const float *)X) free(x);
147:          if (N > 0)
148:          {
149:             do
150:             {
151:                *y = -(*y);
152:                y += i;
153:             }
154:             while (y != st);
155:          }
156:       }
157:    }
158:    else cblas_xerbla(1, "cblas_cgemv", "Illegal Order setting, %d\n", order);
159:    CBLAS_CallFromC = 0;
160:    RowMajorStrg = 0;
161:    return;
162: }
163: