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Increase output size, enlarge kn_values table to support more stages

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DrasLorus 2022-07-06 12:30:25 +02:00
parent d9f80fc165
commit 992b7cdbfe
Signed by: moniere
GPG key ID: 188DD5B072181C0F
1 changed files with 20 additions and 9 deletions
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29
sources/CCordicAbs/CCordicAbs.hpp
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@ -39,9 +39,15 @@
#if __cplusplus < 201402L && XILINX_MAJOR <= 2019
#ifndef kn_values
const double kn_values_define[7] = {
0.70710678118655, 0.632455532033680, 0.613571991077900,
0.608833912517750, 0.607648256256170, 0.607351770141300, 0.607277644093530};
const double kn_values_define[27] = {
0.707106781186547, 0.632455532033676, 0.613571991077896, 0.608833912517752,
0.607648256256168, 0.607351770141296, 0.607277644093526, 0.607259112298893,
0.607254479332562, 0.607253321089875, 0.607253031529134, 0.607252959138945,
0.607252941041397, 0.607252936517010, 0.607252935385914, 0.607252935103139,
0.607252935032446, 0.607252935014772, 0.607252935010354, 0.607252935009249,
0.607252935008973, 0.607252935008904, 0.607252935008887, 0.607252935008883,
0.607252935008882, 0.607252935008881};
#define kn_values kn_values_define
#define kn_i unsigned(kn_values[Tnb_stages - 1] * double(1U << 4))
#endif
@ -55,22 +61,27 @@ template <unsigned TIn_W, unsigned TIn_I, unsigned Tnb_stages>
class CCordicAbs {
public:
#if __cplusplus >= 201402L || XILINX_MAJOR > 2019
static constexpr double kn_values[7] = {
0.70710678118655, 0.632455532033680, 0.613571991077900,
0.608833912517750, 0.607648256256170, 0.607351770141300, 0.607277644093530};
static constexpr double kn_values[27] = {
0.707106781186547, 0.632455532033676, 0.613571991077896, 0.608833912517752,
0.607648256256168, 0.607351770141296, 0.607277644093526, 0.607259112298893,
0.607254479332562, 0.607253321089875, 0.607253031529134, 0.607252959138945,
0.607252941041397, 0.607252936517010, 0.607252935385914, 0.607252935103139,
0.607252935032446, 0.607252935014772, 0.607252935010354, 0.607252935009249,
0.607252935008973, 0.607252935008904, 0.607252935008887, 0.607252935008883,
0.607252935008882, 0.607252935008881};
static constexpr unsigned kn_i = unsigned(kn_values[Tnb_stages - 1] * double(1U << 4)); // 4 bits are enough
#endif
static constexpr unsigned In_W = TIn_W;
static constexpr unsigned In_I = TIn_I;
static constexpr unsigned Out_W = In_W + 2;
static constexpr unsigned Out_I = In_I + 2;
static constexpr unsigned Out_W = In_W + 4;
static constexpr unsigned Out_I = In_I + 4;
static constexpr unsigned nb_stages = Tnb_stages;
static constexpr unsigned in_scale_factor = unsigned(1U << (In_W - In_I));
static constexpr unsigned out_scale_factor = unsigned(1U << (Out_W - Out_I));
static constexpr int64_t scale_cordic(int64_t in) {
static constexpr uint64_t scale_cordic(uint64_t in) {
return in * kn_i / 16U;
}