1 files changed, 75 insertions, 0 deletions
diff --git a/test/regression/floats-basics.c b/test/regression/floats-basics.c
new file mode 100644
index 0000000..0a4c69d
--- /dev/null
+++ b/test/regression/floats-basics.c
@@ -0,0 +1,75 @@
+#include<stdio.h>
+#include<stdlib.h>
+
+#define STR_EXPAND(tok) #tok
+#define STR(tok) STR_EXPAND(tok)
+
+#if defined(__ppc__) || defined(__PPC__)
+#define ARCH_BIG_ENDIAN
+#elif defined(__i386__) || defined(__x86_64__) || defined(__ARMEL__)
+#undef ARCH_BIG_ENDIAN
+#else
+#error "unknown endianness"
+#endif
+
+union converter64 {
+  double dbl;
+  struct {
+#ifdef ARCH_BIG_ENDIAN
+    unsigned h, l;
+#else
+    unsigned l, h;
+#endif
+  } u64;
+};
+
+int num_errors = 0;
+
+void comp64(double d, unsigned high, unsigned low, char* s) {
+  union converter64 c;
+  c.dbl = d;
+  if((c.u64.h & 0x7FF00000) == 0x7FF00000 && (c.u64.l | (c.u64.h & 0xFFFFF)) != 0) {
+    c.u64.l = 0xFFFFFFFF;
+    c.u64.h = 0x7FFFFFFF;
+  }
+  if((high & 0x7FF00000) == 0x7FF00000 && (low | (high & 0xFFFFF)) != 0) {
+    low = 0xFFFFFFFF;
+    high = 0x7FFFFFFF;
+  }
+  if(low != c.u64.l || high != c.u64.h) {
+    printf("%s : %08x %08x (%a)\n", s, c.u64.h, c.u64.l, d);
+    num_errors++;
+  }
+}
+
+void compd(double d1, double d2, char* s) {
+  union converter64 c1, c2;
+  c1.dbl = d1;
+  c2.dbl = d2;
+  if(c1.u64.l != c2.u64.l || c1.u64.h != c2.u64.h) {
+    printf("%s : %a %a\n", s, d1, d2);
+    num_errors++;
+  }
+}
+
+int main(void) {
+  comp64(3.518437208883201171875E+013, 0x42c00000, 0x00000002, STR(__LINE__));
+  compd(1.50000000000000011102230246251565404236316680908203125, 0x1.8p+0, STR(__LINE__));
+  compd(0.500000000000000166533453693773481063544750213623046875, 0x1.0000000000002p-1, STR(__LINE__));
+  compd(1.2, 1.20000000000000005, STR(__LINE__));
+  compd(1.2f, 1.2000001f, STR(__LINE__));
+  compd(1, 1., STR(__LINE__));
+  compd(0.5, .5, STR(__LINE__));
+  compd(1, 1E0, STR(__LINE__));
+  compd(0.5, 0x1p-1, STR(__LINE__));
+  compd(0.5, 0x1.p-1, STR(__LINE__));
+  compd(0.5, 0x.1p3, STR(__LINE__));
+  compd(0.5, 0x.8p0, STR(__LINE__));
+  compd(15./16, 0x.fp0, STR(__LINE__));
+  compd(15./16, 0x.Fp0, STR(__LINE__));
+  compd(15./16, 0x.fP0, STR(__LINE__));
+  compd(15./16, 0X.fp0, STR(__LINE__));
+    
+  printf("%d error(s) detected.\n", num_errors);
+  return 0;
+}