root / synthbench / euroben-dm / mod2ci / rotb.f @ 0:839f52ef7657
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| 1 | 0:839f52ef7657 | louridas | Subroutine rotb( arg, c, s ) |
|---|---|---|---|
| 2 | 0:839f52ef7657 | louridas | ! ---------------------------------------------------------------------- |
| 3 | 0:839f52ef7657 | louridas | ! --- Stores rotation factors arg according to sine/cosine terms of |
| 4 | 0:839f52ef7657 | louridas | ! Givens transformation (used in rgmres). |
| 5 | 0:839f52ef7657 | louridas | ! ---------------------------------------------------------------------- |
| 6 | 0:839f52ef7657 | louridas | Use numerics |
| 7 | 0:839f52ef7657 | louridas | Use floptime |
| 8 | 0:839f52ef7657 | louridas | Implicit None |
| 9 | 0:839f52ef7657 | louridas | |
| 10 | 0:839f52ef7657 | louridas | Real(l_) :: arg, c, s |
| 11 | 0:839f52ef7657 | louridas | ! ---------------------------------------------------------------------- |
| 12 | 0:839f52ef7657 | louridas | If ( c == 0.0_l_ ) Then |
| 13 | 0:839f52ef7657 | louridas | arg = 1.0_l_ |
| 14 | 0:839f52ef7657 | louridas | Else If ( Abs( s ) < Abs( c ) ) Then |
| 15 | 0:839f52ef7657 | louridas | arg = 0.5_l_*s*Sign( 1.0_l_, c ) |
| 16 | 0:839f52ef7657 | louridas | flops = flops + 6 |
| 17 | 0:839f52ef7657 | louridas | Else |
| 18 | 0:839f52ef7657 | louridas | arg = 2.0_l_*Sign( 1.0_l_, s )/c |
| 19 | 0:839f52ef7657 | louridas | flops = flops + 6 |
| 20 | 0:839f52ef7657 | louridas | End If |
| 21 | 0:839f52ef7657 | louridas | ! ---------------------------------------------------------------------- |
| 22 | 0:839f52ef7657 | louridas | End Subroutine rotb |