Details |
Last modification |
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Author |
Line No. |
Line |
| 1906 |
serge |
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/* |
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* Written by J.T. Conklin . |
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* Public domain. |
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*/ |
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/* asin = atan (x / sqrt(1 - x^2)) */ |
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float asinf (float x) |
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{ |
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float res; |
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asm ( "fld %%st\n\t" |
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"fmul %%st(0)\n\t" /* x^2 */ |
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"fld1\n\t" |
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"fsubp\n\t" /* 1 - x^2 */ |
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"fsqrt\n\t" /* sqrt (1 - x^2) */ |
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"fpatan" |
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: "=t" (res) : "0" (x) : "st(1)"); |
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return res; |
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} |
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double asin (double x) |
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{ |
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double res; |
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asm ( "fld %%st\n\t" |
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"fmul %%st(0)\n\t" /* x^2 */ |
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"fld1\n\t" |
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"fsubp\n\t" /* 1 - x^2 */ |
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"fsqrt\n\t" /* sqrt (1 - x^2) */ |
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"fpatan" |
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: "=t" (res) : "0" (x) : "st(1)"); |
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return res; |
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} |