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-skip-if "" { *-*-* } { "-O0" } { "" } } */
  11
  12 extern void link_error(int);
  13
  14 /* Return TRUE if the sign of X != sign of Y.  This is important when
  15    comparing signed zeros.  */
  16 #define CKSGN_F(X,Y) \
  17   (__builtin_copysignf(1.0F,(X)) != __builtin_copysignf(1.0F,(Y)))
  18 #define CKSGN(X,Y) \
  19   (__builtin_copysign(1.0,(X)) != __builtin_copysign(1.0,(Y)))
  20 #define CKSGN_L(X,Y) \
  21   (__builtin_copysignl(1.0L,(X)) != __builtin_copysignl(1.0L,(Y)))
  22
  23 /* Test that FUNC(ARG1,ARG2) == RES.  Check the sign for -0.0.  */
  24 #define TESTIT(FUNC,ARG1,ARG2,RES) do { \
  25   if (__builtin_##FUNC##f(ARG1##f,ARG2) != RES##f \
  26       || CKSGN_F(__builtin_##FUNC##f(ARG1##f,ARG2),RES##f)) \
  27     link_error(__LINE__); \
  28   if (__builtin_##FUNC(ARG1,ARG2) != RES \
  29       || CKSGN(__builtin_##FUNC(ARG1,ARG2),RES)) \
  30     link_error(__LINE__); \
  31   if (__builtin_##FUNC##l(ARG1##l,ARG2) != RES##l \
  32       || CKSGN_L(__builtin_##FUNC##l(ARG1##l,ARG2),RES##l)) \
  33     link_error(__LINE__); \
  34   } while (0)
  35
  36 /* Test that (long)FUNC(ARG1,ARG2) == (long)RES.  The cast is
  37    necessary when RES is not a constant.  */
  38 #define TESTIT2(FUNC,ARG1,ARG2,RES) do { \
  39   if ((long)__builtin_##FUNC##f(ARG1##f,ARG2) != (long)RES##f) \
  40     link_error(__LINE__); \
  41   if ((long)__builtin_##FUNC(ARG1,ARG2) != (long)RES) \
  42     link_error(__LINE__); \
  43   if ((long)__builtin_##FUNC##l(ARG1##l,ARG2) != (long)RES##l) \
  44     link_error(__LINE__); \
  45   } while (0)
  46
  47 /* Test that FUNCRES(FUNC(NEG FUNCARG(ARGARG),ARG2)) is false.  Check
  48    the sign as well.  */
  49 #ifndef __SPU__
  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 #else
  62 #define TESTIT3(FUNC,NEG,FUNCARG,ARGARG,ARG2,FUNCRES) do { \
  63   /* SPU single-precision floating point format does not support Inf or Nan.  */ \
  64   if (!__builtin_##FUNCRES(__builtin_##FUNC(NEG __builtin_##FUNCARG(ARGARG),ARG2)) \
  65       || CKSGN(__builtin_##FUNC(NEG __builtin_##FUNCARG(ARGARG),ARG2), NEG __builtin_##FUNCARG(ARGARG))) \
  66     link_error(__LINE__); \
  67   if (!__builtin_##FUNCRES##l(__builtin_##FUNC##l(NEG __builtin_##FUNCARG##l(ARGARG),ARG2)) \
  68       || CKSGN_L(__builtin_##FUNC##l(NEG __builtin_##FUNCARG##l(ARGARG),ARG2), NEG __builtin_##FUNCARG##l(ARGARG))) \
  69     link_error(__LINE__); \
  70   } while (0)
  71 #endif
  72
  73 /* Using foo==MIN/MAX float values, test that FUNC(foo,EXP) == foo*exp2(EXP),
  74    and also that FUNC(foo,-EXP) == foo*exp2(-EXP).  */
  75 #define TESTIT4(FUNC,EXP) do { \
  76   if (__builtin_##FUNC##f(__FLT_MIN__,EXP) != __FLT_MIN__*__builtin_exp2f(EXP)) \
  77     link_error(__LINE__); \
  78   if (__builtin_##FUNC##f(-__FLT_MIN__,EXP) != -__FLT_MIN__*__builtin_exp2f(EXP)) \
  79     link_error(__LINE__); \
  80   if (__builtin_##FUNC(__DBL_MIN__,EXP) != __DBL_MIN__*__builtin_exp2(EXP)) \
  81     link_error(__LINE__); \
  82   if (__builtin_##FUNC(-__DBL_MIN__,EXP) != -__DBL_MIN__*__builtin_exp2(EXP)) \
  83     link_error(__LINE__); \
  84   if (__builtin_##FUNC##l(__LDBL_MIN__,EXP) != __LDBL_MIN__*__builtin_exp2l(EXP)) \
  85     link_error(__LINE__); \
  86   if (__builtin_##FUNC##l(-__LDBL_MIN__,EXP) != -__LDBL_MIN__*__builtin_exp2l(EXP)) \
  87     link_error(__LINE__); \
  88   if (__builtin_##FUNC##f(__FLT_MAX__,-EXP) != __FLT_MAX__*__builtin_exp2f(-EXP)) \
  89     link_error(__LINE__); \
  90   if (__builtin_##FUNC##f(-__FLT_MAX__,-EXP) != -__FLT_MAX__*__builtin_exp2f(-EXP)) \
  91     link_error(__LINE__); \
  92   if (__builtin_##FUNC(__DBL_MAX__,-EXP) != __DBL_MAX__*__builtin_exp2(-EXP)) \
  93     link_error(__LINE__); \
  94   if (__builtin_##FUNC(-__DBL_MAX__,-EXP) != -__DBL_MAX__*__builtin_exp2(-EXP)) \
  95     link_error(__LINE__); \
  96   if (__builtin_##FUNC##l(__LDBL_MAX__,-EXP) != __LDBL_MAX__*__builtin_exp2l(-EXP)) \
  97     link_error(__LINE__); \
  98   if (__builtin_##FUNC##l(-__LDBL_MAX__,-EXP) != -__LDBL_MAX__*__builtin_exp2l(-EXP)) \
  99     link_error(__LINE__); \
 100   } while (0)
 101
 102 void __attribute__ ((__noinline__))
 103 foo(float xf, double x, long double xl, int i, long l)
 104 {
 105   /* f(0.0, i) -> 0.0 and f(-0.0, i) -> -0.0.  */
 106   TESTIT (ldexp, 0.0, i, 0.0);
 107   TESTIT (ldexp, -0.0, i, -0.0);
 108   TESTIT (scalbn, 0.0, i, 0.0);
 109   TESTIT (scalbn, -0.0, i, -0.0);
 110   TESTIT (scalbln, 0.0, l, 0.0);
 111   TESTIT (scalbln, -0.0, l, -0.0);
 112
 113   /* f(x,0) -> x.  */
 114   TESTIT2 (ldexp, x, 0, x);
 115   TESTIT2 (scalbn, x, 0, x);
 116   TESTIT2 (scalbln, x, 0, x);
 117
 118   /* f(Inf,i) -> Inf and f(NaN,i) -> NaN.  */
 119   TESTIT3 (ldexp, , inf, , i, isinf);
 120   TESTIT3 (ldexp, -, inf, , i, isinf);
 121   TESTIT3 (ldexp, , nan, "", i, isnan);
 122   TESTIT3 (ldexp, -, nan, "", i, isnan);
 123
 124   TESTIT3 (scalbn, , inf, , i, isinf);
 125   TESTIT3 (scalbn, -, inf, , i, isinf);
 126   TESTIT3 (scalbn, , nan, "", i, isnan);
 127   TESTIT3 (scalbn, -, nan, "", i, isnan);
 128
 129   TESTIT3 (scalbln, , inf, , i, isinf);
 130   TESTIT3 (scalbln, -, inf, , i, isinf);
 131   TESTIT3 (scalbln, , nan, "", i, isnan);
 132   TESTIT3 (scalbln, -, nan, "", i, isnan);
 133
 134   /* Evaluate when both arguments are constant.  */
 135   TESTIT (ldexp, 5.0, 3, 40.0);
 136   TESTIT (ldexp, -5.0, 3, -40.0);
 137   TESTIT (ldexp, 5.0, -3, 0.625);
 138   TESTIT (ldexp, -5.0, -3, -0.625);
 139
 140   TESTIT (ldexp, 1000.0, 5, 32000.0);
 141   TESTIT (ldexp, -1000.0, 5, -32000.0);
 142   TESTIT (ldexp, 1000.0, -5, 31.25);
 143   TESTIT (ldexp, -1000.0, -5, -31.25);
 144
 145   /* f(x,N) -> x*exp2(N), using MIN/MAX constants for x and constant N.  */
 146   TESTIT4 (ldexp, 1);
 147   TESTIT4 (ldexp, 2);
 148   TESTIT4 (ldexp, 3);
 149   TESTIT4 (ldexp, 5);
 150   TESTIT4 (ldexp, 9);
 151   TESTIT4 (ldexp, 10);
 152   TESTIT4 (ldexp, 12);
 153   TESTIT4 (ldexp, 18);
 154   TESTIT4 (ldexp, 25);
 155   TESTIT4 (ldexp, 50);
 156   TESTIT4 (ldexp, 75);
 157   TESTIT4 (ldexp, 100);
 158   TESTIT4 (ldexp, 123);
 159
 160   /* These are folded when float radix is two.  */
 161 #if __FLT_RADIX__ == 2
 162   TESTIT (scalbn, 5.0, 3, 40.0);
 163   TESTIT (scalbn, -5.0, 3, -40.0);
 164   TESTIT (scalbn, 5.0, -3, 0.625);
 165   TESTIT (scalbn, -5.0, -3, -0.625);
 166
 167   TESTIT (scalbn, 1000.0, 5, 32000.0);
 168   TESTIT (scalbn, -1000.0, 5, -32000.0);
 169   TESTIT (scalbn, 1000.0, -5, 31.25);
 170   TESTIT (scalbn, -1000.0, -5, -31.25);
 171
 172   TESTIT4 (scalbn, 1);
 173   TESTIT4 (scalbn, 2);
 174   TESTIT4 (scalbn, 3);
 175   TESTIT4 (scalbn, 5);
 176   TESTIT4 (scalbn, 9);
 177   TESTIT4 (scalbn, 10);
 178   TESTIT4 (scalbn, 12);
 179   TESTIT4 (scalbn, 18);
 180   TESTIT4 (scalbn, 25);
 181   TESTIT4 (scalbn, 50);
 182   TESTIT4 (scalbn, 75);
 183   TESTIT4 (scalbn, 100);
 184   TESTIT4 (scalbn, 123);
 185
 186   TESTIT (scalbln, 5.0, 3, 40.0);
 187   TESTIT (scalbln, -5.0, 3, -40.0);
 188   TESTIT (scalbln, 5.0, -3, 0.625);
 189   TESTIT (scalbln, -5.0, -3, -0.625);
 190
 191   TESTIT (scalbln, 1000.0, 5, 32000.0);
 192   TESTIT (scalbln, -1000.0, 5, -32000.0);
 193   TESTIT (scalbln, 1000.0, -5, 31.25);
 194   TESTIT (scalbln, -1000.0, -5, -31.25);
 195
 196   TESTIT4 (scalbln, 1);
 197   TESTIT4 (scalbln, 2);
 198   TESTIT4 (scalbln, 3);
 199   TESTIT4 (scalbln, 5);
 200   TESTIT4 (scalbln, 9);
 201   TESTIT4 (scalbln, 10);
 202   TESTIT4 (scalbln, 12);
 203   TESTIT4 (scalbln, 18);
 204   TESTIT4 (scalbln, 25);
 205   TESTIT4 (scalbln, 50);
 206   TESTIT4 (scalbln, 75);
 207   TESTIT4 (scalbln, 100);
 208   TESTIT4 (scalbln, 123);
 209 #endif
 210 }
 211
 212 int main()
 213 {
 214   foo (0, 0, 0, 0, 0);
 215
 216   return 0;
 217 }