Update to 2.0.0 tree from current Fremantle build

[opencv] / 3rdparty / lapack / slarf.c

diff --git a/3rdparty/lapack/slarf.c b/3rdparty/lapack/slarf.c
new file mode 100644 (file)
index 0000000..7ab2dfa
--- /dev/null
+++ b/3rdparty/lapack/slarf.c
@@ -0,0 +1,139 @@
+#include "clapack.h"
+
+/* Table of constant values */
+
+static real c_b4 = 1.f;
+static real c_b5 = 0.f;
+static integer c__1 = 1;
+
+/* Subroutine */ int slarf_(char *side, integer *m, integer *n, real *v, 
+       integer *incv, real *tau, real *c__, integer *ldc, real *work)
+{
+    /* System generated locals */
+    integer c_dim1, c_offset;
+    real r__1;
+
+    /* Local variables */
+    extern /* Subroutine */ int sger_(integer *, integer *, real *, real *, 
+           integer *, real *, integer *, real *, integer *);
+    extern logical lsame_(char *, char *);
+    extern /* Subroutine */ int sgemv_(char *, integer *, integer *, real *, 
+           real *, integer *, real *, integer *, real *, real *, integer *);
+
+
+/*  -- LAPACK auxiliary routine (version 3.1) -- */
+/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/*     November 2006 */
+
+/*     .. Scalar Arguments .. */
+/*     .. */
+/*     .. Array Arguments .. */
+/*     .. */
+
+/*  Purpose */
+/*  ======= */
+
+/*  SLARF applies a real elementary reflector H to a real m by n matrix */
+/*  C, from either the left or the right. H is represented in the form */
+
+/*        H = I - tau * v * v' */
+
+/*  where tau is a real scalar and v is a real vector. */
+
+/*  If tau = 0, then H is taken to be the unit matrix. */
+
+/*  Arguments */
+/*  ========= */
+
+/*  SIDE    (input) CHARACTER*1 */
+/*          = 'L': form  H * C */
+/*          = 'R': form  C * H */
+
+/*  M       (input) INTEGER */
+/*          The number of rows of the matrix C. */
+
+/*  N       (input) INTEGER */
+/*          The number of columns of the matrix C. */
+
+/*  V       (input) REAL array, dimension */
+/*                     (1 + (M-1)*abs(INCV)) if SIDE = 'L' */
+/*                  or (1 + (N-1)*abs(INCV)) if SIDE = 'R' */
+/*          The vector v in the representation of H. V is not used if */
+/*          TAU = 0. */
+
+/*  INCV    (input) INTEGER */
+/*          The increment between elements of v. INCV <> 0. */
+
+/*  TAU     (input) REAL */
+/*          The value tau in the representation of H. */
+
+/*  C       (input/output) REAL array, dimension (LDC,N) */
+/*          On entry, the m by n matrix C. */
+/*          On exit, C is overwritten by the matrix H * C if SIDE = 'L', */
+/*          or C * H if SIDE = 'R'. */
+
+/*  LDC     (input) INTEGER */
+/*          The leading dimension of the array C. LDC >= max(1,M). */
+
+/*  WORK    (workspace) REAL array, dimension */
+/*                         (N) if SIDE = 'L' */
+/*                      or (M) if SIDE = 'R' */
+
+/*  ===================================================================== */
+
+/*     .. Parameters .. */
+/*     .. */
+/*     .. External Subroutines .. */
+/*     .. */
+/*     .. External Functions .. */
+/*     .. */
+/*     .. Executable Statements .. */
+
+    /* Parameter adjustments */
+    --v;
+    c_dim1 = *ldc;
+    c_offset = 1 + c_dim1;
+    c__ -= c_offset;
+    --work;
+
+    /* Function Body */
+    if (lsame_(side, "L")) {
+
+/*        Form  H * C */
+
+       if (*tau != 0.f) {
+
+/*           w := C' * v */
+
+           sgemv_("Transpose", m, n, &c_b4, &c__[c_offset], ldc, &v[1], incv, 
+                    &c_b5, &work[1], &c__1);
+
+/*           C := C - v * w' */
+
+           r__1 = -(*tau);
+           sger_(m, n, &r__1, &v[1], incv, &work[1], &c__1, &c__[c_offset], 
+                   ldc);
+       }
+    } else {
+
+/*        Form  C * H */
+
+       if (*tau != 0.f) {
+
+/*           w := C * v */
+
+           sgemv_("No transpose", m, n, &c_b4, &c__[c_offset], ldc, &v[1], 
+                   incv, &c_b5, &work[1], &c__1);
+
+/*           C := C - w * v' */
+
+           r__1 = -(*tau);
+           sger_(m, n, &r__1, &work[1], &c__1, &v[1], incv, &c__[c_offset], 
+                   ldc);
+       }
+    }
+    return 0;
+
+/*     End of SLARF */
+
+} /* slarf_ */