alpha: fix rint on sNaN input

The alpha version of rint wrongly return sNaN for sNaN input. Fix that
by checking for NaN and by returning the input value added with itself
in that case.

Changelog:
	* sysdeps/alpha/fpu/s_rint.c (__rint): Add argument with itself
	when it is a NaN.
	* sysdeps/alpha/fpu/s_rintf.c (__rintf): Likewise.

(cherry picked from commit cb7f9d63b921ea1a1cbb4ab377a8484fd5da9a2b)

diff --git a/ChangeLog b/ChangeLog
index 4f8dc172cc4210c60fca9bd04f33255b8d3e902d..b4d4b6af2ae68d2278e4162943bb1c8b5746f49f 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,5 @@
+2016-08-02  Aurelien Jarno  <aurelien@aurel32.net>
+
 2016-08-02  Aurelien Jarno  <aurelien@aurel32.net>
 
        * sysdeps/alpha/fpu/s_ceil.c (__ceil): Add argument with itself
@@ -8,6 +10,9 @@
        when it is a NaN.
        [_IEEE_FP_INEXACT] Remove.
        * sysdeps/alpha/fpu/s_floorf.c (__floorf): Likewise.
+       * sysdeps/alpha/fpu/s_rint.c (__rint): Add argument with itself
+       when it is a NaN.
+       * sysdeps/alpha/fpu/s_rintf.c (__rintf): Likewise.
 
 2016-11-23  Matthew Fortune  <Matthew.Fortune@imgtec.com>
            Maciej W. Rozycki  <macro@imgtec.com>

diff --git a/sysdeps/alpha/fpu/s_rint.c b/sysdeps/alpha/fpu/s_rint.c
index f33fe72c116be997625006bd719cd11c9098f75e..259348afc08dd18880c9a44c4c054bb814ec7ba3 100644 (file)
--- a/sysdeps/alpha/fpu/s_rint.c
+++ b/sysdeps/alpha/fpu/s_rint.c
@@ -23,6 +23,9 @@
 double
 __rint (double x)
 {
+  if (isnan (x))
+    return x + x;
+
   if (isless (fabs (x), 9007199254740992.0))   /* 1 << DBL_MANT_DIG */
     {
       double tmp1, new_x;

diff --git a/sysdeps/alpha/fpu/s_rintf.c b/sysdeps/alpha/fpu/s_rintf.c
index 1400dfe8d76b3bff112a8c58d2876a43598a3923..645728ad5b02e1c9b9c47a8cb3806471e9362ba7 100644 (file)
--- a/sysdeps/alpha/fpu/s_rintf.c
+++ b/sysdeps/alpha/fpu/s_rintf.c
@@ -22,6 +22,9 @@
 float
 __rintf (float x)
 {
+  if (isnanf (x))
+    return x + x;
+
   if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
     {
       /* Note that Alpha S_Floating is stored in registers in a