forked from enlightenment/efl
* eina: Fix negativ case and handle div with more accuracy.
SVN revision: 44281
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e524017f78
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@ -19,6 +19,8 @@
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#ifndef EINA_INLINE_F32P32_X_
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#ifndef EINA_INLINE_F32P32_X_
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# define EINA_INLINE_F32P32_X_
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# define EINA_INLINE_F32P32_X_
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#include <stdlib.h>
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static inline Eina_F32p32
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static inline Eina_F32p32
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eina_f32p32_add(Eina_F32p32 a, Eina_F32p32 b)
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eina_f32p32_add(Eina_F32p32 a, Eina_F32p32 b)
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{
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{
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@ -35,18 +37,23 @@ static inline Eina_F32p32
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eina_f32p32_mul(Eina_F32p32 a, Eina_F32p32 b)
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eina_f32p32_mul(Eina_F32p32 a, Eina_F32p32 b)
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{
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{
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/* Prevent overflow and do '(a * b) >> 32' */
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/* Prevent overflow and do '(a * b) >> 32' */
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/* f32p32 * f32p32 = f64p64 */
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/* Basically do: Eina_F16p16 * Eina_F16p16 = Eina_F32p32 */
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/* f16p16 * f16p16 = f32p32 */
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Eina_F32p32 up;
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Eina_F32p32 up;
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Eina_F32p32 down;
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Eina_F32p32 down;
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Eina_F32p32 result;
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Eina_F32p32 result;
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uint64_t as, bs;
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Eina_F32p32 sign;
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up = (a >> 16) * (b >> 16);
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sign = a ^ b;
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down = (a & 0xFFFF) * (b & 0xFFFF);
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as = llabs(a);
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bs = llabs(b);
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up = (as >> 16) * (bs >> 16);
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down = (as & 0xFFFF) * (bs & 0xFFFF);
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result = up + (down >> 32);
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result = up + (down >> 32);
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return result;
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return sign < 0 ? - result : result;
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}
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}
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static inline Eina_F32p32
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static inline Eina_F32p32
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@ -58,19 +65,17 @@ eina_f32p32_scale(Eina_F32p32 a, int b)
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static inline Eina_F32p32
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static inline Eina_F32p32
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eina_f32p32_div(Eina_F32p32 a, Eina_F32p32 b)
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eina_f32p32_div(Eina_F32p32 a, Eina_F32p32 b)
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{
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{
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/* Prevent overflow and do '(a << 32) / b' */
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Eina_F32p32 sign;
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/* f32p64 / f32p32 = f32p32 */
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/* f32p32 / f32p32 = f32p0 */
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Eina_F32p32 up;
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Eina_F32p32 down;
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Eina_F32p32 result;
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Eina_F32p32 result;
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up = (a / b) << 32;
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sign = a ^ b;
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down = (a << 32) / b;
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result = up + down;
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if (b == 0)
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return sign < 0 ? (Eina_F32p32) 0x8000000000000000 : (Eina_F32p32) 0x7FFFFFFFFFFFFFFF;
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return result;
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result = (eina_f32p32_mul(llabs(a), (((uint64_t) 1 << 62) / ((uint64_t)(llabs(b)) >> 2))));
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return sign < 0 ? - result : result;
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}
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}
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static inline Eina_F32p32
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static inline Eina_F32p32
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