| OLD | NEW |
| 1 #include <math.h> | 1 #include <math.h> |
| 2 #include <stdint.h> | 2 #include <stdint.h> |
| 3 | 3 |
| 4 float fmodf(float x, float y) | 4 float fmodf(float x, float y) { |
| 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 » uint32_t sx = ux.i & 0x80000000; | 9 int ex = ux.i >> 23 & 0xff; |
| 10 » uint32_t i; | 10 int ey = uy.i >> 23 & 0xff; |
| 11 » uint32_t uxi = ux.i; | 11 uint32_t sx = ux.i & 0x80000000; |
| 12 uint32_t i; |
| 13 uint32_t uxi = ux.i; |
| 12 | 14 |
| 13 » if (uy.i<<1 == 0 || isnan(y) || ex == 0xff) | 15 if (uy.i << 1 == 0 || isnan(y) || ex == 0xff) |
| 14 » » return (x*y)/(x*y); | 16 return (x * y) / (x * y); |
| 15 » if (uxi<<1 <= uy.i<<1) { | 17 if (uxi << 1 <= uy.i << 1) { |
| 16 » » if (uxi<<1 == uy.i<<1) | 18 if (uxi << 1 == uy.i << 1) |
| 17 » » » return 0*x; | 19 return 0 * x; |
| 18 » » return x; | 20 return x; |
| 19 » } | 21 } |
| 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 » /* x mod y */ | 41 /* x mod y */ |
| 38 » for (; ex > ey; ex--) { | 42 for (; ex > ey; ex--) { |
| 39 » » i = uxi - uy.i; | 43 i = uxi - uy.i; |
| 40 » » if (i >> 31 == 0) { | 44 if (i >> 31 == 0) { |
| 41 » » » if (i == 0) | 45 if (i == 0) |
| 42 » » » » return 0*x; | 46 return 0 * x; |
| 43 » » » uxi = i; | 47 uxi = i; |
| 44 » » } | 48 } |
| 45 » » uxi <<= 1; | 49 uxi <<= 1; |
| 46 » } | 50 } |
| 47 » i = uxi - uy.i; | 51 i = uxi - uy.i; |
| 48 » if (i >> 31 == 0) { | 52 if (i >> 31 == 0) { |
| 49 » » if (i == 0) | 53 if (i == 0) |
| 50 » » » return 0*x; | 54 return 0 * x; |
| 51 » » uxi = i; | 55 uxi = i; |
| 52 » } | 56 } |
| 53 » for (; uxi>>23 == 0; uxi <<= 1, ex--); | 57 for (; uxi >> 23 == 0; uxi <<= 1, ex--) |
| 58 ; |
| 54 | 59 |
| 55 » /* scale result up */ | 60 /* scale result up */ |
| 56 » if (ex > 0) { | 61 if (ex > 0) { |
| 57 » » uxi -= 1U << 23; | 62 uxi -= 1U << 23; |
| 58 » » uxi |= (uint32_t)ex << 23; | 63 uxi |= (uint32_t)ex << 23; |
| 59 » } else { | 64 } else { |
| 60 » » uxi >>= -ex + 1; | 65 uxi >>= -ex + 1; |
| 61 » } | 66 } |
| 62 » uxi |= sx; | 67 uxi |= sx; |
| 63 » ux.i = uxi; | 68 ux.i = uxi; |
| 64 » return ux.f; | 69 return ux.f; |
| 65 } | 70 } |
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