PR 19700 testcase.

From-SVN: r94443

gcc/testsuite/gcc.c-torture/execute/ieee/copysign2.c

+#include <string.h>
+#include <stdlib.h>
+
+#define TEST(TYPE, EXT)						\
+static TYPE Y##EXT[] = {					\
+  2.0, -2.0, -2.0, -2.0, -2.0, 2.0, -0.0, __builtin_inf##EXT ()	\
+};								\
+static const TYPE Z##EXT[] = {					\
+  1.0, -1.0, -1.0, -0.0, -0.0, 0.0, -__builtin_inf##EXT (),	\
+  __builtin_nan##EXT ("")					\
+};								\
+								\
+void test##EXT (void)						\
+{								\
+  TYPE r[8];							\
+  /* Make sure to avoid comparing unused bits in the type.  */	\
+  memset (r, 0, sizeof r);					\
+  r[0] = __builtin_copysign##EXT (1.0, Y##EXT[0]);		\
+  r[1] = __builtin_copysign##EXT (1.0, Y##EXT[1]);		\
+  r[2] = __builtin_copysign##EXT (-1.0, Y##EXT[2]);		\
+  r[3] = __builtin_copysign##EXT (0.0, Y##EXT[3]);		\
+  r[4] = __builtin_copysign##EXT (-0.0, Y##EXT[4]);		\
+  r[5] = __builtin_copysign##EXT (-0.0, Y##EXT[5]);		\
+  r[6] = __builtin_copysign##EXT (__builtin_inf##EXT (), Y##EXT[6]); \
+  r[7] = __builtin_copysign##EXT (-__builtin_nan##EXT (""), Y##EXT[7]); \
+  if (memcmp (r, Z##EXT, sizeof r) != 0)			\
+    abort ();							\
+}
+
+TEST(float, f)
+TEST(double, )
+TEST(long double, l)
+
+int main()
+{
+  testf();
+  test();
+  testl();
+  return 0;
+}