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

   1 /* Copyright (C) 2007  Free Software Foundation.
   2
   3    Verify that built-in folding of ldexp et al. is correctly performed
   4    by the compiler.
   5
   6    Origin: Kaveh R. Ghazi,  February 17, 2007.  */
   7
   8 /* { dg-do link } */
   9 /* { dg-options "-fno-finite-math-only" { target sh*-*-* } } */
  10 /* { dg-require-effective-target inf } */
  11 /* { dg-skip-if "" { *-*-* } { "-O0" } { "" } } */
  12
  13 extern void link_error(int);
  14
  15 /* Return TRUE if the sign of X != sign of Y.  This is important when
  16    comparing signed zeros.  */
  17 #define CKSGN_F(X,Y) \
  18   (__builtin_copysignf(1.0F,(X)) != __builtin_copysignf(1.0F,(Y)))
  19 #define CKSGN(X,Y) \
  20   (__builtin_copysign(1.0,(X)) != __builtin_copysign(1.0,(Y)))
  21 #define CKSGN_L(X,Y) \
  22   (__builtin_copysignl(1.0L,(X)) != __builtin_copysignl(1.0L,(Y)))
  23
  24 /* Test that FUNC(ARG1,ARG2) == RES.  Check the sign for -0.0.  */
  25 #define TESTIT(FUNC,ARG1,ARG2,RES) do { \
  26   if (__builtin_##FUNC##f(ARG1##f,ARG2) != RES##f \
  27       || CKSGN_F(__builtin_##FUNC##f(ARG1##f,ARG2),RES##f)) \
  28     link_error(__LINE__); \
  29   if (__builtin_##FUNC(ARG1,ARG2) != RES \
  30       || CKSGN(__builtin_##FUNC(ARG1,ARG2),RES)) \
  31     link_error(__LINE__); \
  32   if (__builtin_##FUNC##l(ARG1##l,ARG2) != RES##l \
  33       || CKSGN_L(__builtin_##FUNC##l(ARG1##l,ARG2),RES##l)) \
  34     link_error(__LINE__); \
  35   } while (0)
  36
  37 /* Test that (long)FUNC(ARG1,ARG2) == (long)RES.  The cast is
  38    necessary when RES is not a constant.  */
  39 #define TESTIT2(FUNC,ARG1,ARG2,RES) do { \
  40   if ((long)__builtin_##FUNC##f(ARG1##f,ARG2) != (long)RES##f) \
  41     link_error(__LINE__); \
  42   if ((long)__builtin_##FUNC(ARG1,ARG2) != (long)RES) \
  43     link_error(__LINE__); \
  44   if ((long)__builtin_##FUNC##l(ARG1##l,ARG2) != (long)RES##l) \
  45     link_error(__LINE__); \
  46   } while (0)
  47
  48 /* Test that FUNCRES(FUNC(NEG FUNCARG(ARGARG),ARG2)) is false.  Check
  49    the sign as well.  */
  50 #define TESTIT3(FUNC,NEG,FUNCARG,ARGARG,ARG2,FUNCRES) do { \
  51   if (!__builtin_##FUNCRES##f(__builtin_##FUNC##f(NEG __builtin_##FUNCARG##f(ARGARG),ARG2)) \
  52       || CKSGN_F(__builtin_##FUNC##f(NEG __builtin_##FUNCARG##f(ARGARG),ARG2), NEG __builtin_##FUNCARG##f(ARGARG))) \
  53     link_error(__LINE__); \
  54   if (!__builtin_##FUNCRES(__builtin_##FUNC(NEG __builtin_##FUNCARG(ARGARG),ARG2)) \
  55       || CKSGN(__builtin_##FUNC(NEG __builtin_##FUNCARG(ARGARG),ARG2), NEG __builtin_##FUNCARG(ARGARG))) \
  56     link_error(__LINE__); \
  57   if (!__builtin_##FUNCRES##l(__builtin_##FUNC##l(NEG __builtin_##FUNCARG##l(ARGARG),ARG2)) \
  58       || CKSGN_L(__builtin_##FUNC##l(NEG __builtin_##FUNCARG##l(ARGARG),ARG2), NEG __builtin_##FUNCARG##l(ARGARG))) \
  59     link_error(__LINE__); \
  60   } while (0)
  61
  62 /* Using foo==MIN/MAX float values, test that FUNC(foo,EXP) == foo*exp2(EXP),
  63    and also that FUNC(foo,-EXP) == foo*exp2(-EXP).  */
  64 #define TESTIT4(FUNC,EXP) do { \
  65   if (__builtin_##FUNC##f(__FLT_MIN__,EXP) != __FLT_MIN__*__builtin_exp2f(EXP)) \
  66     link_error(__LINE__); \
  67   if (__builtin_##FUNC##f(-__FLT_MIN__,EXP) != -__FLT_MIN__*__builtin_exp2f(EXP)) \
  68     link_error(__LINE__); \
  69   if (__builtin_##FUNC(__DBL_MIN__,EXP) != __DBL_MIN__*__builtin_exp2(EXP)) \
  70     link_error(__LINE__); \
  71   if (__builtin_##FUNC(-__DBL_MIN__,EXP) != -__DBL_MIN__*__builtin_exp2(EXP)) \
  72     link_error(__LINE__); \
  73   if (__builtin_##FUNC##l(__LDBL_MIN__,EXP) != __LDBL_MIN__*__builtin_exp2l(EXP)) \
  74     link_error(__LINE__); \
  75   if (__builtin_##FUNC##l(-__LDBL_MIN__,EXP) != -__LDBL_MIN__*__builtin_exp2l(EXP)) \
  76     link_error(__LINE__); \
  77   if (__builtin_##FUNC##f(__FLT_MAX__,-EXP) != __FLT_MAX__*__builtin_exp2f(-EXP)) \
  78     link_error(__LINE__); \
  79   if (__builtin_##FUNC##f(-__FLT_MAX__,-EXP) != -__FLT_MAX__*__builtin_exp2f(-EXP)) \
  80     link_error(__LINE__); \
  81   if (__builtin_##FUNC(__DBL_MAX__,-EXP) != __DBL_MAX__*__builtin_exp2(-EXP)) \
  82     link_error(__LINE__); \
  83   if (__builtin_##FUNC(-__DBL_MAX__,-EXP) != -__DBL_MAX__*__builtin_exp2(-EXP)) \
  84     link_error(__LINE__); \
  85   if (__builtin_##FUNC##l(__LDBL_MAX__,-EXP) != __LDBL_MAX__*__builtin_exp2l(-EXP)) \
  86     link_error(__LINE__); \
  87   if (__builtin_##FUNC##l(-__LDBL_MAX__,-EXP) != -__LDBL_MAX__*__builtin_exp2l(-EXP)) \
  88     link_error(__LINE__); \
  89   } while (0)
  90
  91 void __attribute__ ((__noinline__))
  92 foo(float xf, double x, long double xl, int i, long l)
  93 {
  94   /* f(0.0, i) -> 0.0 and f(-0.0, i) -> -0.0.  */
  95   TESTIT (ldexp, 0.0, i, 0.0);
  96   TESTIT (ldexp, -0.0, i, -0.0);
  97   TESTIT (scalbn, 0.0, i, 0.0);
  98   TESTIT (scalbn, -0.0, i, -0.0);
  99   TESTIT (scalbln, 0.0, l, 0.0);
 100   TESTIT (scalbln, -0.0, l, -0.0);
 101
 102   /* f(x,0) -> x.  */
 103   TESTIT2 (ldexp, x, 0, x);
 104   TESTIT2 (scalbn, x, 0, x);
 105   TESTIT2 (scalbln, x, 0, x);
 106
 107   /* f(Inf,i) -> Inf and f(NaN,i) -> NaN.  */
 108   TESTIT3 (ldexp, , inf, , i, isinf);
 109   TESTIT3 (ldexp, -, inf, , i, isinf);
 110   TESTIT3 (ldexp, , nan, "", i, isnan);
 111   TESTIT3 (ldexp, -, nan, "", i, isnan);
 112
 113   TESTIT3 (scalbn, , inf, , i, isinf);
 114   TESTIT3 (scalbn, -, inf, , i, isinf);
 115   TESTIT3 (scalbn, , nan, "", i, isnan);
 116   TESTIT3 (scalbn, -, nan, "", i, isnan);
 117
 118   TESTIT3 (scalbln, , inf, , i, isinf);
 119   TESTIT3 (scalbln, -, inf, , i, isinf);
 120   TESTIT3 (scalbln, , nan, "", i, isnan);
 121   TESTIT3 (scalbln, -, nan, "", i, isnan);
 122
 123   /* Evaluate when both arguments are constant.  */
 124   TESTIT (ldexp, 5.0, 3, 40.0);
 125   TESTIT (ldexp, -5.0, 3, -40.0);
 126   TESTIT (ldexp, 5.0, -3, 0.625);
 127   TESTIT (ldexp, -5.0, -3, -0.625);
 128
 129   TESTIT (ldexp, 1000.0, 5, 32000.0);
 130   TESTIT (ldexp, -1000.0, 5, -32000.0);
 131   TESTIT (ldexp, 1000.0, -5, 31.25);
 132   TESTIT (ldexp, -1000.0, -5, -31.25);
 133
 134   /* f(x,N) -> x*exp2(N), using MIN/MAX constants for x and constant N.  */
 135   TESTIT4 (ldexp, 1);
 136   TESTIT4 (ldexp, 2);
 137   TESTIT4 (ldexp, 3);
 138   TESTIT4 (ldexp, 5);
 139   TESTIT4 (ldexp, 9);
 140   TESTIT4 (ldexp, 10);
 141   TESTIT4 (ldexp, 12);
 142   TESTIT4 (ldexp, 18);
 143   TESTIT4 (ldexp, 25);
 144   TESTIT4 (ldexp, 50);
 145   TESTIT4 (ldexp, 75);
 146   TESTIT4 (ldexp, 100);
 147   TESTIT4 (ldexp, 123);
 148
 149   /* These are folded when float radix is two.  */
 150 #if __FLT_RADIX__ == 2
 151   TESTIT (scalbn, 5.0, 3, 40.0);
 152   TESTIT (scalbn, -5.0, 3, -40.0);
 153   TESTIT (scalbn, 5.0, -3, 0.625);
 154   TESTIT (scalbn, -5.0, -3, -0.625);
 155
 156   TESTIT (scalbn, 1000.0, 5, 32000.0);
 157   TESTIT (scalbn, -1000.0, 5, -32000.0);
 158   TESTIT (scalbn, 1000.0, -5, 31.25);
 159   TESTIT (scalbn, -1000.0, -5, -31.25);
 160
 161   TESTIT4 (scalbn, 1);
 162   TESTIT4 (scalbn, 2);
 163   TESTIT4 (scalbn, 3);
 164   TESTIT4 (scalbn, 5);
 165   TESTIT4 (scalbn, 9);
 166   TESTIT4 (scalbn, 10);
 167   TESTIT4 (scalbn, 12);
 168   TESTIT4 (scalbn, 18);
 169   TESTIT4 (scalbn, 25);
 170   TESTIT4 (scalbn, 50);
 171   TESTIT4 (scalbn, 75);
 172   TESTIT4 (scalbn, 100);
 173   TESTIT4 (scalbn, 123);
 174
 175   TESTIT (scalbln, 5.0, 3, 40.0);
 176   TESTIT (scalbln, -5.0, 3, -40.0);
 177   TESTIT (scalbln, 5.0, -3, 0.625);
 178   TESTIT (scalbln, -5.0, -3, -0.625);
 179
 180   TESTIT (scalbln, 1000.0, 5, 32000.0);
 181   TESTIT (scalbln, -1000.0, 5, -32000.0);
 182   TESTIT (scalbln, 1000.0, -5, 31.25);
 183   TESTIT (scalbln, -1000.0, -5, -31.25);
 184
 185   TESTIT4 (scalbln, 1);
 186   TESTIT4 (scalbln, 2);
 187   TESTIT4 (scalbln, 3);
 188   TESTIT4 (scalbln, 5);
 189   TESTIT4 (scalbln, 9);
 190   TESTIT4 (scalbln, 10);
 191   TESTIT4 (scalbln, 12);
 192   TESTIT4 (scalbln, 18);
 193   TESTIT4 (scalbln, 25);
 194   TESTIT4 (scalbln, 50);
 195   TESTIT4 (scalbln, 75);
 196   TESTIT4 (scalbln, 100);
 197   TESTIT4 (scalbln, 123);
 198 #endif
 199 }
 200
 201 int main()
 202 {
 203   foo (0, 0, 0, 0, 0);
 204
 205   return 0;
 206 }