Purge out setNan from math.cxx

Change-Id: I95f9b37b564bb733f44899a8c6c1ea3c36e35694
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118196
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

1 files changed, 4 insertions, 19 deletions

diff --git a/sal/rtl/math.cxx b/sal/rtl/math.cxx
index 88354763b2b4..75981d970d74 100644
--- a/sal/rtl/math.cxx
+++ b/sal/rtl/math.cxx
@@ -865,7 +865,7 @@ double stringToDouble(CharT const * pBegin, CharT const * pEnd,
             && (CharT('N') == p[2]))
         {
             p += 3;
-            rtl::math::setNan( &fVal );
+            fVal = std::numeric_limits<double>::quiet_NaN();
             bDone = true;
         }
         else if ((CharT('I') == p[0]) && (CharT('N') == p[1])
@@ -1012,19 +1012,8 @@ double stringToDouble(CharT const * pBegin, CharT const * pEnd,
             {
                 // "1.#NAN", "+1.#NAN", "-1.#NAN"
                 p += 4;
-                rtl::math::setNan( &fVal );
-                if (bSign)
-                {
-                    union {
-                        double sd;
-                        sal_math_Double md;
-                    } m;
-
-                    m.sd = fVal;
-                    m.md.w32_parts.msw |= 0x80000000; // create negative NaN
-                    fVal = m.sd;
-                    bSign = false; // don't negate again
-                }
+                fVal = std::numeric_limits<double>::quiet_NaN();
+                // bSign will cause negation of fVal in the end, producing a negative NAN.
 
                 // Eat any further digits:
                 while (p != pEnd && rtl::isAsciiDigit(*p))
@@ -1443,11 +1432,7 @@ double SAL_CALL rtl_math_acosh(double fX) SAL_THROW_EXTERN_C()
 {
     volatile double fZ = fX - 1.0;
     if (fX < 1.0)
-    {
-        double fResult;
-        ::rtl::math::setNan( &fResult );
-        return fResult;
-    }
+        return std::numeric_limits<double>::quiet_NaN();
     if ( fX == 1.0 )
         return 0.0;