| OLD | NEW |
| 1 #include <math.h> | 1 #include <math.h> |
| 2 #include <stdint.h> | 2 #include <stdint.h> |
| 3 | 3 |
| 4 float remquof(float x, float y, int *quo) | 4 float remquof(float x, float y, int* quo) { |
| 5 { | 5 union { |
| 6 » union {float f; uint32_t i;} ux = {x}, uy = {y}; | 6 float f; |
| 7 » int ex = ux.i>>23 & 0xff; | 7 uint32_t i; |
| 8 » int ey = uy.i>>23 & 0xff; | 8 } ux = {x}, uy = {y}; |
| 9 » int sx = ux.i>>31; | 9 int ex = ux.i >> 23 & 0xff; |
| 10 » int sy = uy.i>>31; | 10 int ey = uy.i >> 23 & 0xff; |
| 11 » uint32_t q; | 11 int sx = ux.i >> 31; |
| 12 » uint32_t i; | 12 int sy = uy.i >> 31; |
| 13 » uint32_t uxi = ux.i; | 13 uint32_t q; |
| 14 uint32_t i; |
| 15 uint32_t uxi = ux.i; |
| 14 | 16 |
| 15 » *quo = 0; | 17 *quo = 0; |
| 16 » if (uy.i<<1 == 0 || isnan(y) || ex == 0xff) | 18 if (uy.i << 1 == 0 || isnan(y) || ex == 0xff) |
| 17 » » return (x*y)/(x*y); | 19 return (x * y) / (x * y); |
| 18 » if (ux.i<<1 == 0) | 20 if (ux.i << 1 == 0) |
| 19 » » return x; | 21 return x; |
| 20 | 22 |
| 21 » /* normalize x and y */ | 23 /* normalize x and y */ |
| 22 » if (!ex) { | 24 if (!ex) { |
| 23 » » for (i = uxi<<9; i>>31 == 0; ex--, i <<= 1); | 25 for (i = uxi << 9; i >> 31 == 0; ex--, i <<= 1) |
| 24 » » uxi <<= -ex + 1; | 26 ; |
| 25 » } else { | 27 uxi <<= -ex + 1; |
| 26 » » uxi &= -1U >> 9; | 28 } else { |
| 27 » » uxi |= 1U << 23; | 29 uxi &= -1U >> 9; |
| 28 » } | 30 uxi |= 1U << 23; |
| 29 » if (!ey) { | 31 } |
| 30 » » for (i = uy.i<<9; i>>31 == 0; ey--, i <<= 1); | 32 if (!ey) { |
| 31 » » uy.i <<= -ey + 1; | 33 for (i = uy.i << 9; i >> 31 == 0; ey--, i <<= 1) |
| 32 » } else { | 34 ; |
| 33 » » uy.i &= -1U >> 9; | 35 uy.i <<= -ey + 1; |
| 34 » » uy.i |= 1U << 23; | 36 } else { |
| 35 » } | 37 uy.i &= -1U >> 9; |
| 38 uy.i |= 1U << 23; |
| 39 } |
| 36 | 40 |
| 37 » q = 0; | 41 q = 0; |
| 38 » if (ex < ey) { | 42 if (ex < ey) { |
| 39 » » if (ex+1 == ey) | 43 if (ex + 1 == ey) |
| 40 » » » goto end; | 44 goto end; |
| 41 » » return x; | 45 return x; |
| 42 » } | 46 } |
| 43 | 47 |
| 44 » /* x mod y */ | 48 /* x mod y */ |
| 45 » for (; ex > ey; ex--) { | 49 for (; ex > ey; ex--) { |
| 46 » » i = uxi - uy.i; | 50 i = uxi - uy.i; |
| 47 » » if (i >> 31 == 0) { | 51 if (i >> 31 == 0) { |
| 48 » » » uxi = i; | 52 uxi = i; |
| 49 » » » q++; | 53 q++; |
| 50 » » } | 54 } |
| 51 » » uxi <<= 1; | 55 uxi <<= 1; |
| 52 » » q <<= 1; | 56 q <<= 1; |
| 53 » } | 57 } |
| 54 » i = uxi - uy.i; | 58 i = uxi - uy.i; |
| 55 » if (i >> 31 == 0) { | 59 if (i >> 31 == 0) { |
| 56 » » uxi = i; | 60 uxi = i; |
| 57 » » q++; | 61 q++; |
| 58 » } | 62 } |
| 59 » if (uxi == 0) | 63 if (uxi == 0) |
| 60 » » ex = -30; | 64 ex = -30; |
| 61 » else | 65 else |
| 62 » » for (; uxi>>23 == 0; uxi <<= 1, ex--); | 66 for (; uxi >> 23 == 0; uxi <<= 1, ex--) |
| 67 ; |
| 63 end: | 68 end: |
| 64 » /* scale result and decide between |x| and |x|-|y| */ | 69 /* scale result and decide between |x| and |x|-|y| */ |
| 65 » if (ex > 0) { | 70 if (ex > 0) { |
| 66 » » uxi -= 1U << 23; | 71 uxi -= 1U << 23; |
| 67 » » uxi |= (uint32_t)ex << 23; | 72 uxi |= (uint32_t)ex << 23; |
| 68 » } else { | 73 } else { |
| 69 » » uxi >>= -ex + 1; | 74 uxi >>= -ex + 1; |
| 70 » } | 75 } |
| 71 » ux.i = uxi; | 76 ux.i = uxi; |
| 72 » x = ux.f; | 77 x = ux.f; |
| 73 » if (sy) | 78 if (sy) |
| 74 » » y = -y; | 79 y = -y; |
| 75 » if (ex == ey || (ex+1 == ey && (2*x > y || (2*x == y && q%2)))) { | 80 if (ex == ey || (ex + 1 == ey && (2 * x > y || (2 * x == y && q % 2)))) { |
| 76 » » x -= y; | 81 x -= y; |
| 77 » » q++; | 82 q++; |
| 78 » } | 83 } |
| 79 » q &= 0x7fffffff; | 84 q &= 0x7fffffff; |
| 80 » *quo = sx^sy ? -(int)q : (int)q; | 85 *quo = sx ^ sy ? -(int)q : (int)q; |
| 81 » return sx ? -x : x; | 86 return sx ? -x : x; |
| 82 } | 87 } |
| OLD | NEW |