mirror of git://gcc.gnu.org/git/gcc.git
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
typedef float KFtype __attribute__ ((mode (KF)));
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typedef __complex float KCtype __attribute__ ((mode (KC)));
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#define COPYSIGN(x,y) __builtin_copysignq (x, y)
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#define INFINITY __builtin_infq ()
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#define isnan __builtin_isnan
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#define isinf __builtin_isinf
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KCtype
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__mulkc3 (KFtype a, KFtype b, KFtype c, KFtype d)
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{
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KFtype ac, bd, ad, bc, x, y;
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KCtype res;
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ac = a * c;
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bd = b * d;
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ad = a * d;
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bc = b * c;
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x = ac - bd;
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y = ad + bc;
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if (isnan (x) && isnan (y))
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{
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/* Recover infinities that computed as NaN + iNaN. */
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_Bool recalc = 0;
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if (isinf (a) || isinf (b))
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{
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/* z is infinite. "Box" the infinity and change NaNs in
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the other factor to 0. */
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a = COPYSIGN (isinf (a) ? 1 : 0, a);
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b = COPYSIGN (isinf (b) ? 1 : 0, b);
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if (isnan (c)) c = COPYSIGN (0, c);
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if (isnan (d)) d = COPYSIGN (0, d);
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recalc = 1;
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}
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if (isinf (c) || isinf (d))
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{
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/* w is infinite. "Box" the infinity and change NaNs in
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the other factor to 0. */
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c = COPYSIGN (isinf (c) ? 1 : 0, c);
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d = COPYSIGN (isinf (d) ? 1 : 0, d);
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if (isnan (a)) a = COPYSIGN (0, a);
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if (isnan (b)) b = COPYSIGN (0, b);
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recalc = 1;
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}
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if (!recalc
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&& (isinf (ac) || isinf (bd)
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|| isinf (ad) || isinf (bc)))
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{
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/* Recover infinities from overflow by changing NaNs to 0. */
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if (isnan (a)) a = COPYSIGN (0, a);
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if (isnan (b)) b = COPYSIGN (0, b);
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if (isnan (c)) c = COPYSIGN (0, c);
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if (isnan (d)) d = COPYSIGN (0, d);
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recalc = 1;
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}
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if (recalc)
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{
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x = INFINITY * (a * c - b * d);
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y = INFINITY * (a * d + b * c);
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}
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}
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__real__ res = x;
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__imag__ res = y;
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return res;
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}
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