Use __floor not floor in sinf.

The new sinf implementation introduced localplt failures for all
platforms where the compiler did not inline the calls to floor
(converted to trunc by machine-independent optimizations).  This patch
changes the calls to use __floor as normal in libm.

We can't use the public function names floor / floorf / floorl /
floorf128 in libm code in the absence of appropriate asms to redirect
floor/trunc calls, if not inlined, to use the internal names instead
(while avoiding breaking code building the floor functions themselves)
- while having such asms and then calling the public functions
unconditionally would be desirable for optimization (few architectures
have __floor inlines in math_private.h, and once the built-in function
is used you don't need them), using __floor is the minimum safe fix
for the present test regressions.

Tested with build-many-glibcs.py that this fixes the localplt test
failure for arm-linux-gnueabi.

	* sysdeps/ieee754/flt-32/s_sinf.c (SINF_FUNC): Use __floor instead
	of floor.

2 files changed, 7 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 6ac924be24..61c25076cf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-04  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/ieee754/flt-32/s_sinf.c (SINF_FUNC): Use __floor instead
+	of floor.
+
 2017-12-04  Siddhesh Poyarekar  <siddhesh@sourceware.org>
 
 	* sysdeps/aarch64/multiarch/memcpy_generic.S (__GI_memcpy):
diff --git a/sysdeps/ieee754/flt-32/s_sinf.c b/sysdeps/ieee754/flt-32/s_sinf.c
index f03dba4a8a..40d3d197a8 100644
--- a/sysdeps/ieee754/flt-32/s_sinf.c
+++ b/sysdeps/ieee754/flt-32/s_sinf.c
@@ -177,8 +177,8 @@ SINF_FUNC (float x)
 	{
 	  if (abstheta < 0x1p+23)     /* |x| < 2^23.  */
 	    {
-	      unsigned long int n = floor (abstheta * inv_PI_4) + 1.0;
-	      double x = floor (n / 2.0);
+	      unsigned long int n = __floor (abstheta * inv_PI_4) + 1.0;
+	      double x = __floor (n / 2.0);
 	      theta = x * PI_2_lo + (x * PI_2_hi + abstheta);
 	      /* Argument reduction needed.  */
 	      return reduced (theta, n, signbit);