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 /* { dg-options "-fno-finite-math-only" { target sh*-*-* } } */
  10
  11 extern void link_error(int);
  12
  13 /* Return TRUE if the sign of X != sign of Y.  This is important when
  14    comparing signed zeros.  */
  15 #define CKSGN_F(X,Y) \
  16   (__builtin_copysignf(1.0F,(X)) != __builtin_copysignf(1.0F,(Y)))
  17 #define CKSGN(X,Y) \
  18   (__builtin_copysign(1.0,(X)) != __builtin_copysign(1.0,(Y)))
  19 #define CKSGN_L(X,Y) \
  20   (__builtin_copysignl(1.0L,(X)) != __builtin_copysignl(1.0L,(Y)))
  21
  22 /* We can only check the exponent when optimizing since we rely on
  23    other optimizations to propagate the value.  TRUE means an error
  24    occurred.  */
  25 #ifdef __OPTIMIZE__
  26 #define CKEXP(X,Y) X != Y
  27 #else
  28 #define CKEXP(X,Y) 0
  29 #endif
  30
  31 /* Test that frexp(ARG,&i) == RES && i == EXP.  Check the sign in
  32    case we get -0.0.  */
  33 #define TESTIT_FREXP(ARG,RES,EXP) do { \
  34   int i = 123456; \
  35   if (__builtin_frexpf(ARG##f,&i) != RES##f \
  36       || CKEXP(i,EXP) \
  37       || CKSGN_F(__builtin_frexpf(ARG##f,&i),RES##f)) \
  38     link_error(__LINE__); \
  39   i = 123456; \
  40   if (__builtin_frexp(ARG,&i) != RES \
  41       || CKEXP(i,EXP) \
  42       || CKSGN(__builtin_frexp(ARG,&i),RES)) \
  43     link_error(__LINE__); \
  44   i = 123456; \
  45   if (__builtin_frexpl(ARG##l,&i) != RES##l \
  46       || CKEXP(i,EXP) \
  47       || CKSGN_L(__builtin_frexpl(ARG##l,&i),RES##l)) \
  48     link_error(__LINE__); \
  49   } while (0)
  50
  51 /* Test that FUNCRES(frexp(NEG FUNCARG(ARGARG),&i)) is false.  Check
  52    the sign as well.  Ensure side-effects are evaluated in i.  */
  53 #define TESTIT_FREXP2(NEG,FUNCARG,ARGARG,FUNCRES) do { \
  54   int i=5; \
  55   if (!__builtin_##FUNCRES##f(__builtin_frexpf(NEG __builtin_##FUNCARG##f(ARGARG),&i)) \
  56       || CKSGN_F(__builtin_frexpf(NEG __builtin_##FUNCARG##f(ARGARG),(i++,&i)), NEG __builtin_##FUNCARG##f(ARGARG)) \
  57       || CKEXP(i,6)) \
  58     link_error(__LINE__); \
  59   if (!__builtin_##FUNCRES(__builtin_frexp(NEG __builtin_##FUNCARG(ARGARG),&i)) \
  60       || CKSGN(__builtin_frexp(NEG __builtin_##FUNCARG(ARGARG),(i++,&i)), NEG __builtin_##FUNCARG(ARGARG)) \
  61       || CKEXP(i,7)) \
  62     link_error(__LINE__); \
  63   if (!__builtin_##FUNCRES##l(__builtin_frexpl(NEG __builtin_##FUNCARG##l(ARGARG),&i)) \
  64       || CKSGN_L(__builtin_frexpl(NEG __builtin_##FUNCARG##l(ARGARG),(i++,&i)), NEG __builtin_##FUNCARG##l(ARGARG)) \
  65       || CKEXP(i,8)) \
  66     link_error(__LINE__); \
  67   } while (0)
  68
  69 void __attribute__ ((__noinline__))
  70 foo(void)
  71 {
  72   /* Test that frexp(ARG1,&i) -> ARG2 && i == ARG3.  */
  73   TESTIT_FREXP (-0x1p40, -0.5, 41);
  74   TESTIT_FREXP (-0x1p30, -0.5, 31);
  75   TESTIT_FREXP (-0x1p20, -0.5, 21);
  76   TESTIT_FREXP (-0x1p10, -0.5, 11);
  77   TESTIT_FREXP (-0x1p5, -0.5, 6);
  78   TESTIT_FREXP (-100/3.0, -100/192.0, 6);
  79   TESTIT_FREXP (-1.5, -0.75, 1);
  80   TESTIT_FREXP (-1.0, -0.5, 1);
  81   TESTIT_FREXP (-1/3.0, -2/3.0, -1);
  82   TESTIT_FREXP (-1/9.0, -8/9.0, -3);
  83   TESTIT_FREXP (-0x1p-5, -0.5, -4);
  84   TESTIT_FREXP (-0x1p-10, -0.5, -9);
  85   TESTIT_FREXP (-0x1p-20, -0.5, -19);
  86   TESTIT_FREXP (-0x1p-30, -0.5, -29);
  87   TESTIT_FREXP (-0x1p-40, -0.5, -39);
  88   TESTIT_FREXP (-0.0, -0.0, 0);
  89   TESTIT_FREXP (0.0, 0.0, 0);
  90   TESTIT_FREXP (0x1p-40, 0.5, -39);
  91   TESTIT_FREXP (0x1p-30, 0.5, -29);
  92   TESTIT_FREXP (0x1p-20, 0.5, -19);
  93   TESTIT_FREXP (0x1p-10, 0.5, -9);
  94   TESTIT_FREXP (0x1p-5, 0.5, -4);
  95   TESTIT_FREXP (1/9.0, 8/9.0, -3);
  96   TESTIT_FREXP (1/3.0, 2/3.0, -1);
  97   TESTIT_FREXP (1.0, 0.5, 1);
  98   TESTIT_FREXP (1.5, 0.75, 1);
  99   TESTIT_FREXP (100/3.0, 100/192.0, 6);
 100   TESTIT_FREXP (0x1p5, 0.5, 6);
 101   TESTIT_FREXP (0x1p10, 0.5, 11);
 102   TESTIT_FREXP (0x1p20, 0.5, 21);
 103   TESTIT_FREXP (0x1p30, 0.5, 31);
 104   TESTIT_FREXP (0x1p40, 0.5, 41);
 105
 106   /* Test for frexp(+-Inf,&i) -> +-Inf and frexp(+-NaN,&i) -> +-NaN.
 107      Exponent is left unspecified, but we test for side-effects.  */
 108   TESTIT_FREXP2 ( ,inf, , isinf);
 109   TESTIT_FREXP2 (- ,inf, , isinf);
 110   TESTIT_FREXP2 ( ,nan, "", isnan);
 111   TESTIT_FREXP2 (- ,nan, "", isnan);
 112 }
 113
 114 int main()
 115 {
 116   foo ();
 117
 118   return 0;
 119 }