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| 214 | isqrt (int n) |
214 | isqrt (int n) |
| 215 | { |
215 | { |
| 216 | return (int)sqrtf ((float)n); |
216 | return (int)sqrtf ((float)n); |
| 217 | } |
217 | } |
| 218 | |
218 | |
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219 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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220 | // more handy than it looks like, due to the implicit !! done on its arguments |
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221 | inline bool |
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222 | logical_xor (bool a, bool b) |
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223 | { |
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224 | return a != b; |
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225 | } |
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226 | |
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227 | inline bool |
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228 | logical_implies (bool a, bool b) |
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229 | { |
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230 | return a <= b; |
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231 | } |
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232 | |
| 219 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
233 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
| 220 | #if 0 |
234 | #if 0 |
| 221 | // and has a max. error of 6 in the range -100..+100. |
235 | // and has a max. error of 6 in the range -100..+100. |
| 222 | #else |
236 | #else |
| 223 | // and has a max. error of 9 in the range -100..+100. |
237 | // and has a max. error of 9 in the range -100..+100. |
