| struct ieee754_double { |
| double d; |
| }; |
| extern const float __exp_deltatable[178]; |
| float __ieee754_expf (float x) |
| { |
| static const float himark = 88.72283935546875; |
| static const float lomark = -103.972084045410; |
| if (__builtin_isless(x, himark) && __builtin_isgreater(x, lomark)) |
| { |
| int tval; |
| double x22, t, result, dx; |
| float delta; |
| struct ieee754_double ex2_u; |
| dx -= t; |
| tval = (int) (t * 512.0); |
| if (t >= 0) |
| delta = - __exp_deltatable[tval]; |
| else |
| delta = __exp_deltatable[-tval]; |
| x22 = (0.5000000496709180453 * dx + 1.0000001192102037084) * dx + delta; |
| result = x22 * ex2_u.d + ex2_u.d; |
| return (float) result; |
| } |
| return x; |
| } |
