82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
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/* -- translated by f2c (version 19940927).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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*/
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#include "f2c.h"
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/* Subroutine */ int sscal_(integer *n, real *sa, real *sx, integer *incx)
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{
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/* System generated locals */
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integer i__1, i__2;
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/* Local variables */
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static integer i, m, nincx, mp1;
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/* scales a vector by a constant.
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uses unrolled loops for increment equal to 1.
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jack dongarra, linpack, 3/11/78.
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modified 3/93 to return if incx .le. 0.
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modified 12/3/93, array(1) declarations changed to array(*)
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Parameter adjustments
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Function Body */
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#define SX(I) sx[(I)-1]
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if (*n <= 0 || *incx <= 0) {
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return 0;
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}
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if (*incx == 1) {
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goto L20;
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}
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/* code for increment not equal to 1 */
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nincx = *n * *incx;
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i__1 = nincx;
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i__2 = *incx;
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for (i = 1; *incx < 0 ? i >= nincx : i <= nincx; i += *incx) {
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SX(i) = *sa * SX(i);
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/* L10: */
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}
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return 0;
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/* code for increment equal to 1
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clean-up loop */
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L20:
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m = *n % 5;
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if (m == 0) {
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goto L40;
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}
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i__2 = m;
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for (i = 1; i <= m; ++i) {
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SX(i) = *sa * SX(i);
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/* L30: */
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}
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if (*n < 5) {
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return 0;
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}
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L40:
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mp1 = m + 1;
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i__2 = *n;
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for (i = mp1; i <= *n; i += 5) {
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SX(i) = *sa * SX(i);
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SX(i + 1) = *sa * SX(i + 1);
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SX(i + 2) = *sa * SX(i + 2);
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SX(i + 3) = *sa * SX(i + 3);
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SX(i + 4) = *sa * SX(i + 4);
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/* L50: */
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}
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return 0;
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} /* sscal_ */
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