Mercurial > octave-nkf
view libcruft/blas/caxpy.f @ 7789:82be108cc558
First attempt at single precision tyeps
* * *
corrections to qrupdate single precision routines
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prefer demotion to single over promotion to double
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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> |
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date | Sun, 27 Apr 2008 22:34:17 +0200 |
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SUBROUTINE CAXPY(N,CA,CX,INCX,CY,INCY) * .. Scalar Arguments .. COMPLEX CA INTEGER INCX,INCY,N * .. * .. Array Arguments .. COMPLEX CX(*),CY(*) * .. * * Purpose * ======= * * CAXPY constant times a vector plus a vector. * * Further Details * =============== * * jack dongarra, linpack, 3/11/78. * modified 12/3/93, array(1) declarations changed to array(*) * * .. Local Scalars .. INTEGER I,IX,IY * .. * .. External Functions .. REAL SCABS1 EXTERNAL SCABS1 * .. IF (N.LE.0) RETURN IF (SCABS1(CA).EQ.0.0E+0) RETURN IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 * * code for unequal increments or equal increments * not equal to 1 * IX = 1 IY = 1 IF (INCX.LT.0) IX = (-N+1)*INCX + 1 IF (INCY.LT.0) IY = (-N+1)*INCY + 1 DO 10 I = 1,N CY(IY) = CY(IY) + CA*CX(IX) IX = IX + INCX IY = IY + INCY 10 CONTINUE RETURN * * code for both increments equal to 1 * 20 DO 30 I = 1,N CY(I) = CY(I) + CA*CX(I) 30 CONTINUE RETURN END