gcc/testsuite/gcc.dg/torture/builtin-frexp-1.c

   1 /* Copyright (C) 2007  Free Software Foundation.
   2
   3    Verify that built-in folding of frexp is correctly performed by the
   4    compiler.
   5
   6    Origin: Kaveh R. Ghazi,  February 21, 2007.  */
   7
   8 /* { dg-do link } */
   9
  10 extern void link_error(int);
  11
  12 /* Return TRUE if the sign of X != sign of Y.  This is important when
  13    comparing signed zeros.  */
  14 #define CKSGN_F(X,Y) \
  15   (__builtin_copysignf(1.0F,(X)) != __builtin_copysignf(1.0F,(Y)))
  16 #define CKSGN(X,Y) \
  17   (__builtin_copysign(1.0,(X)) != __builtin_copysign(1.0,(Y)))
  18 #define CKSGN_L(X,Y) \
  19   (__builtin_copysignl(1.0L,(X)) != __builtin_copysignl(1.0L,(Y)))
  20
  21 /* We can only check the exponent when optimizing since we rely on
  22    other optimizations to propagate the value.  TRUE means an error
  23    occurred.  */
  24 #ifdef __OPTIMIZE__
  25 #define CKEXP(X,Y) X != Y
  26 #else
  27 #define CKEXP(X,Y) 0
  28 #endif
  29
  30 /* Test that frexp(ARG,&i) == RES && i == EXP.  Check the sign in
  31    case we get -0.0.  */
  32 #define TESTIT_FREXP(ARG,RES,EXP) do { \
  33   int i = 123456; \
  34   if (__builtin_frexpf(ARG##f,&i) != RES##f \
  35       || CKEXP(i,EXP) \
  36       || CKSGN_F(__builtin_frexpf(ARG##f,&i),RES##f)) \
  37     link_error(__LINE__); \
  38   i = 123456; \
  39   if (__builtin_frexp(ARG,&i) != RES \
  40       || CKEXP(i,EXP) \
  41       || CKSGN(__builtin_frexp(ARG,&i),RES)) \
  42     link_error(__LINE__); \
  43   i = 123456; \
  44   if (__builtin_frexpl(ARG##l,&i) != RES##l \
  45       || CKEXP(i,EXP) \
  46       || CKSGN_L(__builtin_frexpl(ARG##l,&i),RES##l)) \
  47     link_error(__LINE__); \
  48   } while (0)
  49
  50 /* Test that FUNCRES(frexp(NEG FUNCARG(ARGARG),&i)) is false.  Check
  51    the sign as well.  Ensure side-effects are evaluated in i.  */
  52 #define TESTIT_FREXP2(NEG,FUNCARG,ARGARG,FUNCRES) do { \
  53   int i=5; \
  54   if (!__builtin_##FUNCRES##f(__builtin_frexpf(NEG __builtin_##FUNCARG##f(ARGARG),&i)) \
  55       || CKSGN_F(__builtin_frexpf(NEG __builtin_##FUNCARG##f(ARGARG),(i++,&i)), NEG __builtin_##FUNCARG##f(ARGARG)) \
  56       || CKEXP(i,6)) \
  57     link_error(__LINE__); \
  58   if (!__builtin_##FUNCRES(__builtin_frexp(NEG __builtin_##FUNCARG(ARGARG),&i)) \
  59       || CKSGN(__builtin_frexp(NEG __builtin_##FUNCARG(ARGARG),(i++,&i)), NEG __builtin_##FUNCARG(ARGARG)) \
  60       || CKEXP(i,7)) \
  61     link_error(__LINE__); \
  62   if (!__builtin_##FUNCRES##l(__builtin_frexpl(NEG __builtin_##FUNCARG##l(ARGARG),&i)) \
  63       || CKSGN_L(__builtin_frexpl(NEG __builtin_##FUNCARG##l(ARGARG),(i++,&i)), NEG __builtin_##FUNCARG##l(ARGARG)) \
  64       || CKEXP(i,8)) \
  65     link_error(__LINE__); \
  66   } while (0)
  67
  68 void __attribute__ ((__noinline__))
  69 foo(void)
  70 {
  71   /* Test that frexp(ARG1,&i) -> ARG2 && i == ARG3.  */
  72   TESTIT_FREXP (-0x1p40, -0.5, 41);
  73   TESTIT_FREXP (-0x1p30, -0.5, 31);
  74   TESTIT_FREXP (-0x1p20, -0.5, 21);
  75   TESTIT_FREXP (-0x1p10, -0.5, 11);
  76   TESTIT_FREXP (-0x1p5, -0.5, 6);
  77   TESTIT_FREXP (-100/3.0, -100/192.0, 6);
  78   TESTIT_FREXP (-1.5, -0.75, 1);
  79   TESTIT_FREXP (-1.0, -0.5, 1);
  80   TESTIT_FREXP (-1/3.0, -2/3.0, -1);
  81   TESTIT_FREXP (-1/9.0, -8/9.0, -3);
  82   TESTIT_FREXP (-0x1p-5, -0.5, -4);
  83   TESTIT_FREXP (-0x1p-10, -0.5, -9);
  84   TESTIT_FREXP (-0x1p-20, -0.5, -19);
  85   TESTIT_FREXP (-0x1p-30, -0.5, -29);
  86   TESTIT_FREXP (-0x1p-40, -0.5, -39);
  87   TESTIT_FREXP (-0.0, -0.0, 0);
  88   TESTIT_FREXP (0.0, 0.0, 0);
  89   TESTIT_FREXP (0x1p-40, 0.5, -39);
  90   TESTIT_FREXP (0x1p-30, 0.5, -29);
  91   TESTIT_FREXP (0x1p-20, 0.5, -19);
  92   TESTIT_FREXP (0x1p-10, 0.5, -9);
  93   TESTIT_FREXP (0x1p-5, 0.5, -4);
  94   TESTIT_FREXP (1/9.0, 8/9.0, -3);
  95   TESTIT_FREXP (1/3.0, 2/3.0, -1);
  96   TESTIT_FREXP (1.0, 0.5, 1);
  97   TESTIT_FREXP (1.5, 0.75, 1);
  98   TESTIT_FREXP (100/3.0, 100/192.0, 6);
  99   TESTIT_FREXP (0x1p5, 0.5, 6);
 100   TESTIT_FREXP (0x1p10, 0.5, 11);
 101   TESTIT_FREXP (0x1p20, 0.5, 21);
 102   TESTIT_FREXP (0x1p30, 0.5, 31);
 103   TESTIT_FREXP (0x1p40, 0.5, 41);
 104
 105   /* Test for frexp(+-Inf,&i) -> +-Inf and frexp(+-NaN,&i) -> +-NaN.
 106      Exponent is left unspecified, but we test for side-effects.  */
 107   TESTIT_FREXP2 ( ,inf, , isinf);
 108   TESTIT_FREXP2 (- ,inf, , isinf);
 109   TESTIT_FREXP2 ( ,nan, "", isnan);
 110   TESTIT_FREXP2 (- ,nan, "", isnan);
 111 }
 112
 113 int main()
 114 {
 115   foo ();
 116
 117   return 0;
 118 }