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* eina: Fix negativ case and handle div with more accuracy. 

SVN revision: 44281
This commit is contained in:
Cedric BAIL 2009-12-08 16:02:10 +00:00
parent e524017f78
commit b6183fe571
1 changed files with 19 additions and 14 deletions
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33
legacy/eina/src/include/eina_inline_f32p32.x
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@ -19,6 +19,8 @@
#ifndef EINA_INLINE_F32P32_X_
# define EINA_INLINE_F32P32_X_
#include <stdlib.h>
static inline Eina_F32p32
eina_f32p32_add(Eina_F32p32 a, Eina_F32p32 b)
{
@ -35,18 +37,23 @@ static inline Eina_F32p32
eina_f32p32_mul(Eina_F32p32 a, Eina_F32p32 b)
{
/* Prevent overflow and do '(a * b) >> 32' */
/* f32p32 * f32p32 = f64p64 */
/* f16p16 * f16p16 = f32p32 */
/* Basically do: Eina_F16p16 * Eina_F16p16 = Eina_F32p32 */
Eina_F32p32 up;
Eina_F32p32 down;
Eina_F32p32 result;
uint64_t as, bs;
Eina_F32p32 sign;
up = (a >> 16) * (b >> 16);
down = (a & 0xFFFF) * (b & 0xFFFF);
sign = a ^ b;
as = llabs(a);
bs = llabs(b);
up = (as >> 16) * (bs >> 16);
down = (as & 0xFFFF) * (bs & 0xFFFF);
result = up + (down >> 32);
return result;
return sign < 0 ? - result : result;
}
static inline Eina_F32p32
@ -58,19 +65,17 @@ eina_f32p32_scale(Eina_F32p32 a, int b)
static inline Eina_F32p32
eina_f32p32_div(Eina_F32p32 a, Eina_F32p32 b)
{
/* Prevent overflow and do '(a << 32) / b' */
/* f32p64 / f32p32 = f32p32 */
/* f32p32 / f32p32 = f32p0 */
Eina_F32p32 up;
Eina_F32p32 down;
Eina_F32p32 sign;
Eina_F32p32 result;
up = (a / b) << 32;
down = (a << 32) / b;
sign = a ^ b;
result = up + down;
if (b == 0)
return sign < 0 ? (Eina_F32p32) 0x8000000000000000 : (Eina_F32p32) 0x7FFFFFFFFFFFFFFF;
return result;
result = (eina_f32p32_mul(llabs(a), (((uint64_t) 1 << 62) / ((uint64_t)(llabs(b)) >> 2))));
return sign < 0 ? - result : result;
}
static inline Eina_F32p32