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88 lines
1.8 KiB
88 lines
1.8 KiB
#include "clapack.h" |
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doublereal dasum_(integer *n, doublereal *dx, 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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doublereal ret_val, d__1, d__2, d__3, d__4, d__5, d__6; |
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/* Local variables */ |
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integer i__, m, mp1; |
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doublereal dtemp; |
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integer nincx; |
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/* .. Scalar Arguments .. */ |
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/* .. */ |
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/* .. Array Arguments .. */ |
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/* .. */ |
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/* Purpose */ |
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/* ======= */ |
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/* takes the sum of the absolute values. */ |
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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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/* .. Local Scalars .. */ |
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/* .. */ |
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/* .. Intrinsic Functions .. */ |
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/* .. */ |
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/* Parameter adjustments */ |
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--dx; |
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/* Function Body */ |
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ret_val = 0.; |
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dtemp = 0.; |
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if (*n <= 0 || *incx <= 0) { |
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return ret_val; |
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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; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) { |
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dtemp += (d__1 = dx[i__], abs(d__1)); |
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/* L10: */ |
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} |
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ret_val = dtemp; |
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return ret_val; |
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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 % 6; |
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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__ <= i__2; ++i__) { |
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dtemp += (d__1 = dx[i__], abs(d__1)); |
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/* L30: */ |
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} |
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if (*n < 6) { |
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goto L60; |
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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__ <= i__2; i__ += 6) { |
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dtemp = dtemp + (d__1 = dx[i__], abs(d__1)) + (d__2 = dx[i__ + 1], |
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abs(d__2)) + (d__3 = dx[i__ + 2], abs(d__3)) + (d__4 = dx[i__ |
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+ 3], abs(d__4)) + (d__5 = dx[i__ + 4], abs(d__5)) + (d__6 = |
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dx[i__ + 5], abs(d__6)); |
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/* L50: */ |
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} |
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L60: |
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ret_val = dtemp; |
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return ret_val; |
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} /* dasum_ */
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