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Diffstat (limited to 'math/ieee/chap1/r4tr.f')
| -rw-r--r-- | math/ieee/chap1/r4tr.f | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/math/ieee/chap1/r4tr.f b/math/ieee/chap1/r4tr.f new file mode 100644 index 00000000..5fc46eab --- /dev/null +++ b/math/ieee/chap1/r4tr.f @@ -0,0 +1,18 @@ +c +c----------------------------------------------------------------------- +c subroutine: r4tr +c radix 4 iteration subroutine +c----------------------------------------------------------------------- +c + subroutine r4tr(int, b0, b1, b2, b3) + dimension b0(2), b1(2), b2(2), b3(2) + do 10 k=1,int + r0 = b0(k) + b2(k) + r1 = b1(k) + b3(k) + b2(k) = b0(k) - b2(k) + b3(k) = b1(k) - b3(k) + b0(k) = r0 + r1 + b1(k) = r0 - r1 + 10 continue + return + end |