00001 /* dla_wwaddw.f -- translated by f2c (version 20061008). 00002 You must link the resulting object file with libf2c: 00003 on Microsoft Windows system, link with libf2c.lib; 00004 on Linux or Unix systems, link with .../path/to/libf2c.a -lm 00005 or, if you install libf2c.a in a standard place, with -lf2c -lm 00006 -- in that order, at the end of the command line, as in 00007 cc *.o -lf2c -lm 00008 Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., 00009 00010 http://www.netlib.org/f2c/libf2c.zip 00011 */ 00012 00013 #include "f2c.h" 00014 #include "blaswrap.h" 00015 00016 /* Subroutine */ int dla_wwaddw__(integer *n, doublereal *x, doublereal *y, 00017 doublereal *w) 00018 { 00019 /* System generated locals */ 00020 integer i__1; 00021 00022 /* Local variables */ 00023 integer i__; 00024 doublereal s; 00025 00026 00027 /* -- LAPACK routine (version 3.2) -- */ 00028 /* -- Contributed by James Demmel, Deaglan Halligan, Yozo Hida and -- */ 00029 /* -- Jason Riedy of Univ. of California Berkeley. -- */ 00030 /* -- November 2008 -- */ 00031 00032 /* -- LAPACK is a software package provided by Univ. of Tennessee, -- */ 00033 /* -- Univ. of California Berkeley and NAG Ltd. -- */ 00034 00035 /* .. */ 00036 /* .. Scalar Arguments .. */ 00037 /* .. */ 00038 /* .. Array Arguments .. */ 00039 /* .. */ 00040 00041 /* Purpose */ 00042 /* ======= */ 00043 00044 /* DLA_WWADDW adds a vector W into a doubled-single vector (X, Y). */ 00045 00046 /* This works for all extant IBM's hex and binary floating point */ 00047 /* arithmetics, but not for decimal. */ 00048 00049 /* Arguments */ 00050 /* ========= */ 00051 00052 /* N (input) INTEGER */ 00053 /* The length of vectors X, Y, and W. */ 00054 00055 /* X, Y (input/output) DOUBLE PRECISION array, length N */ 00056 /* The doubled-single accumulation vector. */ 00057 00058 /* W (input) DOUBLE PRECISION array, length N */ 00059 /* The vector to be added. */ 00060 /* .. */ 00061 /* .. Local Scalars .. */ 00062 /* .. */ 00063 /* .. Executable Statements .. */ 00064 00065 /* Parameter adjustments */ 00066 --w; 00067 --y; 00068 --x; 00069 00070 /* Function Body */ 00071 i__1 = *n; 00072 for (i__ = 1; i__ <= i__1; ++i__) { 00073 s = x[i__] + w[i__]; 00074 s = s + s - s; 00075 y[i__] = x[i__] - s + w[i__] + y[i__]; 00076 x[i__] = s; 00077 /* L10: */ 00078 } 00079 return 0; 00080 } /* dla_wwaddw__ */