gcc/testsuite/gcc.dg/pr32293.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 unsigned int _IDEC_glbround;
   5 unsigned int _IDEC_glbflags;
   6 typedef unsigned UINT32;
   7 typedef signed SINT32;
   8 typedef unsigned long long UINT64;
   9 typedef signed long long SINT64;
  10 typedef
  11 __attribute__ ((aligned(16)))
  12      struct {
  13        UINT64 w[2];
  14      } UINT128;
  15
  16 static __inline UINT64
  17 unpack_BID128 (UINT64 * psign_x, int *pexponent_x,
  18         UINT128 * pcoefficient_x, UINT128 * px) {
  19   UINT128 coeff;
  20   UINT64 ex;
  21   *psign_x = (px->w[1]) & 0x8000000000000000ull;
  22   ex = (px->w[1]) >> 49;
  23   *pexponent_x = ((int) ex) & 0x3fff;
  24   return coeff.w[0] | coeff.w[1];
  25 }
  26
  27 static __inline UINT32
  28 get_BID32 (UINT32 sgn, int expon, UINT64 coeff, int rmode,
  29     unsigned *fpsc) {
  30   UINT32 r;
  31
  32   if (((unsigned) expon) > 191) {
  33       r = sgn | 0x78000000ul;
  34       switch (rmode) {
  35       case 0x00002:
  36         if (sgn)
  37           r = sgn | 0x77f8967f;
  38       }
  39       return r;
  40   }
  41   r = expon;
  42   return r;
  43 }
  44
  45 UINT32
  46 bid128_to_bid32 (UINT128 x)
  47 {
  48   UINT128 *px;
  49   UINT128 CX;
  50   UINT64 sign_x;
  51   UINT32 res;
  52   int exponent_x = 0;
  53   px = &x;
  54   if (!unpack_BID128 (&sign_x, &exponent_x, &CX, px)) {
  55       return(res);
  56   }
  57   res = get_BID32 ((UINT32) (sign_x >> 32),
  58         exponent_x, CX.w[0], _IDEC_glbround, &_IDEC_glbflags);
  59   return(res);;
  60 }
  61