native: fix indexing bugs in Dlasq6
MODIFY
native/dlasq6.go
native/dlasq6.go
@@ -73,7 +73,7 @@ func (impl Implementation) Dlasq6(i0, n0 int, z []float64, pp int, dmin, dmin1,
// Unroll last two steps.
dnm2 = d
dmin2 = dmin
- j4 = 4*(n0-2) - pp - 1
+ j4 = 4*(n0-1) - pp - 1
j4p2 := j4 + 2*pp - 1
z[j4-2] = dnm2 + z[j4p2]
if z[j4-2] == 0 {
@@ -87,7 +87,7 @@ func (impl Implementation) Dlasq6(i0, n0 int, z []float64, pp int, dmin, dmin1,
dnm1 = dnm2 * tmp
} else {
z[j4] = z[j4p2+2] * (z[j4p2] / z[j4-2])
- dnm1 = z[j4p2] * (dnm2 / z[j4-2])
+ dnm1 = z[j4p2+2] * (dnm2 / z[j4-2])
}
dmin = math.Min(dmin, dnm1)
dmin1 = dmin
@@ -105,7 +105,7 @@ func (impl Implementation) Dlasq6(i0, n0 int, z []float64, pp int, dmin, dmin1,
dn = dnm1 * tmp
} else {
z[j4] = z[j4p2+2] * (z[j4p2] / z[j4-2])
- dn = z[j4p2] * (dnm2 / z[j4-2])
+ dn = z[j4p2+2] * (dnm1 / z[j4-2])
}
dmin = math.Min(dmin, dn)
z[j4+2] = dn

native: fix indexing bugs in Dlasq6