Rewritten.
authordrepper <drepper>
Wed, 7 May 1997 15:29:27 +0000 (15:29 +0000)
committerdrepper <drepper>
Wed, 7 May 1997 15:29:27 +0000 (15:29 +0000)
sysdeps/m68k/fpu/s_cexp.c

index 4846ec1..86cc894 100644 (file)
@@ -25,9 +25,6 @@
 #ifndef SUFF
 #define SUFF
 #endif
-#ifndef huge_val
-#define huge_val HUGE_VAL
-#endif
 #ifndef float_type
 #define float_type double
 #endif
@@ -40,85 +37,79 @@ __complex__ float_type
 s(__cexp) (__complex__ float_type x)
 {
   __complex__ float_type retval;
+  unsigned long ix_cond;
+
+  ix_cond = __m81_test (__imag__ x);
 
-  if (m81(__finite) (__real__ x))
+  if ((ix_cond & (__M81_COND_NAN|__M81_COND_INF)) == 0)
     {
-      if (m81(__finite) (__imag__ x))
+      /* Imaginary part is finite.  */
+      float_type exp_val = m81(__ieee754_exp) (__real__ x);
+
+      __real__ retval = __imag__ retval = exp_val;
+      if (m81(__finite) (exp_val))
        {
-         float_type exp_val = m81(__ieee754_exp) (__real__ x);
+         float_type sin_ix, cos_ix;
+         __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_ix), "=f" (cos_ix)
+                : "f" (__imag__ x));
+         __real__ retval *= cos_ix;
+         if (ix_cond & __M81_COND_ZERO)
+           __imag__ retval = __imag__ x;
+         else
+           __imag__ retval *= sin_ix;
+       }
+      else
+       {
+         /* Compute the sign of the result.  */
+         float_type remainder, pi_2;
+         int quadrant;
 
-         __real__ retval = __imag__ retval = exp_val;
-         if (m81(__finite) (exp_val))
+         __asm ("fmovecr %#0,%0\n\tfscale%.w %#-1,%0" : "=f" (pi_2));
+         __asm ("fmod%.x %2,%0\n\tfmove%.l %/fpsr,%1"
+                : "=f" (remainder), "=dm" (quadrant)
+                : "f" (pi_2), "0" (__imag__ x));
+         quadrant = (quadrant >> 16) & 0x83;
+         if (quadrant & 0x80)
+           quadrant ^= 0x83;
+         switch (quadrant)
            {
-             float_type sin_ix, cos_ix;
-             __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_ix), "=f" (cos_ix)
-                    : "f" (__imag__ x));
-             __real__ retval *= cos_ix;
-             __imag__ retval *= sin_ix;
+           default:
+             break;
+           case 1:
+             __real__ retval = -__real__ retval;
+             break;
+           case 2:
+             __real__ retval = -__real__ retval;
+           case 3:
+             __imag__ retval = -__imag__ retval;
+             break;
            }
-         else
-           goto fix_sign;
+         if (ix_cond & __M81_COND_ZERO && !m81(__isnan) (exp_val))
+           __imag__ retval = __imag__ x;
        }
-      else
-       /* If the imaginary part is +-inf or NaN and the real part is
-          not +-inf the result is NaN + iNaN.  */
-       __real__ retval = __imag__ retval = 0.0/0.0;
     }
-  else if (m81(__isinf) (__real__ x))
+  else
     {
-      if (m81(__finite) (__imag__ x))
-       {
-         float_type value = m81(__signbit) (__real__ x) ? 0.0 : huge_val;
+      unsigned long rx_cond = __m81_test (__real__ x);
 
-         if (__imag__ x == 0.0)
+      if (rx_cond & __M81_COND_INF)
+       {
+         /* Real part is infinite.  */
+         if (rx_cond & __M81_COND_NEG)
            {
-             __real__ retval = value;
-             __imag__ retval = __imag__ x;
+             __real__ retval = __imag__ retval = 0.0;
+             if (ix_cond & __M81_COND_NEG)
+               __imag__ retval = -__imag__ retval;
            }
          else
            {
-             float_type remainder, pi_2;
-             int quadrant;
-             __real__ retval = value;
-             __imag__ retval = value;
-
-           fix_sign:
-             __asm ("fmovecr %#0,%0\n\tfscale%.w %#-1,%0" : "=f" (pi_2));
-             __asm ("fmod%.x %2,%0\n\tfmove%.l %/fpsr,%1"
-                    : "=f" (remainder), "=dm" (quadrant)
-                    : "f" (pi_2), "0" (__imag__ x));
-             quadrant = (quadrant >> 16) & 0x83;
-             if (quadrant & 0x80)
-               quadrant ^= 0x83;
-             switch (quadrant)
-               {
-               default:
-                 break;
-               case 1:
-                 __real__ retval = -__real__ retval;
-                 break;
-               case 2:
-                 __real__ retval = -__real__ retval;
-               case 3:
-                 __imag__ retval = -__imag__ retval;
-                 break;
-               }
+             __real__ retval = __real__ x;
+             __imag__ retval = __imag__ x - __imag__ x;
            }
        }
-      else if (m81(__signbit) (__real__ x) == 0)
-       {
-         __real__ retval = huge_val;
-         __imag__ retval = 0.0/0.0;
-       }
       else
-       {
-         __real__ retval = 0.0;
-         __imag__ retval = s(__copysign) (0.0, __imag__ x);
-       }
+       __real__ retval = __imag__ retval = __imag__ x - __imag__ x;
     }
-  else
-    /* If the real part is NaN the result is NaN + iNaN.  */
-    __real__ retval = __imag__ retval = 0.0/0.0;
 
   return retval;
 }