Use chopped rounding to add 0.5.
2014-07-03 Richard Henderson <rth@redhat.com>
+ * sysdeps/alpha/fpu/s_lround.c: Add 0.5 with chopped rounding.
+ * sysdeps/alpha/fpu/s_lroundf.c: Likewise.
+
* sysdeps/alpha/fpu/s_round.c: Remove file.
* sysdeps/alpha/fpu/s_roundf.c: Remove file.
long int
__lround (double x)
{
- double adj;
+ double adj, y;
- adj = 0x1.fffffffffffffp-2; /* nextafter (0.5, 0.0) */
- adj = copysign (adj, x);
- return x + adj;
+ adj = copysign (0.5, x);
+ asm("addt/suc %1,%2,%0" : "=&f"(y) : "f"(x), "f"(adj));
+ return y;
}
strong_alias (__lround, __llround)
long int
__lroundf (float x)
{
- float adj;
+ float adj, y;
- adj = 0x1.fffffep-2; /* nextafterf (0.5f, 0.0f) */
- adj = copysignf (adj, x);
- return x + adj;
+ adj = copysignf (0.5f, x);
+ asm("adds/suc %1,%2,%0" : "=&f"(y) : "f"(x), "f"(adj));
+ return y;
}
strong_alias (__lroundf, __llroundf)