s_sinf.c: Replace floor with simple casts

Since s_sinf.c either assigns the return value of floor to integer or
passes double converted from integer to floor, this patch replaces
floor with simple casts.

Also since long == int for 32-bit targets, we can use long instead of
int to avoid 64-bit integer for 64-bit targets.

On Skylake, bench-sinf reports performance improvement:

           Before        After         Improvement
max        130.566       129.564           30%
min        7.704         7.706             0%
mean       21.8188       19.1363           30%

	* sysdeps/ieee754/flt-32/s_sinf.c (reduced): Replace long with
	int.
	(SINF_FUNC): Likewise.  Replace floor with simple casts.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index f36d934c52..5636a571fa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-12-05  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* sysdeps/ieee754/flt-32/s_sinf.c (reduced): Replace long with
+	int.
+	(SINF_FUNC): Likewise.  Replace floor with simple casts.
+
 2017-12-05  Mike FABIAN  <mfabian@redhat.com>
 
 	[BZ #22517]