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Formerly m68k/fpu/atan2.c.~6~
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@ -21,17 +21,12 @@ Cambridge, MA 02139, USA. */
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#ifdef __GNUC__
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static CONST double
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PIo4 = 7.8539816339744827900E-1 , /*Hex 2^ -1 * 1.921FB54442D18 */
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PIo2 = 1.5707963267948965580E0 , /*Hex 2^ 0 * 1.921FB54442D18 */
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PI = 3.1415926535897931160E0 ; /*Hex 2^ 1 * 1.921FB54442D18 */
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double
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DEFUN(atan2, (y, x), double y AND double x)
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{
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static CONST double one = 1.0, zero = 0.0;
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double signx, signy;
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double pi;
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double pi, PIo4, PIo2;
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if (__isnan(x))
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return x;
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@ -42,6 +37,8 @@ DEFUN(atan2, (y, x), double y AND double x)
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signx = __copysign(one, x);
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asm("fmovecr%.x %1, %0" : "=f" (pi) : "i" (0));
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PIo2 = pi / 2;
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PIo4 = pi / 4;
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if (y == zero)
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return signx == one ? y : __copysign(pi, signy);
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