| 73,6 → 73,8 |
|---|
| #define DRM_FIXED_ONE (1ULL << DRM_FIXED_POINT) |
| #define DRM_FIXED_DECIMAL_MASK (DRM_FIXED_ONE - 1) |
| #define DRM_FIXED_DIGITS_MASK (~DRM_FIXED_DECIMAL_MASK) |
| #define DRM_FIXED_EPSILON 1LL |
| #define DRM_FIXED_ALMOST_ONE (DRM_FIXED_ONE - DRM_FIXED_EPSILON) |
| |
| static inline s64 drm_int2fixp(int a) |
| { |
| 79,13 → 81,21 |
|---|
| return ((s64)a) << DRM_FIXED_POINT; |
| } |
| |
| static inline int drm_fixp2int(int64_t a) |
| static inline int drm_fixp2int(s64 a) |
| { |
| return ((s64)a) >> DRM_FIXED_POINT; |
| } |
| |
| static inline unsigned drm_fixp_msbset(int64_t a) |
| static inline int drm_fixp2int_ceil(s64 a) |
| { |
| if (a > 0) |
| return drm_fixp2int(a + DRM_FIXED_ALMOST_ONE); |
| else |
| return drm_fixp2int(a - DRM_FIXED_ALMOST_ONE); |
| } |
| |
| static inline unsigned drm_fixp_msbset(s64 a) |
| { |
| unsigned shift, sign = (a >> 63) & 1; |
| |
| for (shift = 62; shift > 0; --shift) |
| 136,6 → 146,45 |
|---|
| return result; |
| } |
| |
| static inline s64 drm_fixp_from_fraction(s64 a, s64 b) |
| { |
| s64 res; |
| bool a_neg = a < 0; |
| bool b_neg = b < 0; |
| u64 a_abs = a_neg ? -a : a; |
| u64 b_abs = b_neg ? -b : b; |
| u64 rem; |
| |
| /* determine integer part */ |
| u64 res_abs = div64_u64_rem(a_abs, b_abs, &rem); |
| |
| /* determine fractional part */ |
| { |
| u32 i = DRM_FIXED_POINT; |
| |
| do { |
| rem <<= 1; |
| res_abs <<= 1; |
| if (rem >= b_abs) { |
| res_abs |= 1; |
| rem -= b_abs; |
| } |
| } while (--i != 0); |
| } |
| |
| /* round up LSB */ |
| { |
| u64 summand = (rem << 1) >= b_abs; |
| |
| res_abs += summand; |
| } |
| |
| res = (s64) res_abs; |
| if (a_neg ^ b_neg) |
| res = -res; |
| return res; |
| } |
| |
| static inline s64 drm_fixp_exp(s64 x) |
| { |
| s64 tolerance = div64_s64(DRM_FIXED_ONE, 1000000); |