msvcrt: Import rintf implementation from musl.

configure

@@ -19652,7 +19652,6 @@ for ac_func in \
 	remainderf \
 	remquo \
 	remquof \
-	rintf \
 	tgamma \
 	tgammaf \
 	trunc \

configure.ac

@@ -2692,7 +2692,6 @@ AC_CHECK_FUNCS(\
 	remainderf \
 	remquo \
 	remquof \
-	rintf \
 	tgamma \
 	tgammaf \
 	trunc \

dlls/msvcrt/math.c

@@ -4312,10 +4312,27 @@ double CDECL rint(double x)
 
 /*********************************************************************
  *      rintf (MSVCR120.@)
+ *
+ * Copied from musl: src/math/rintf.c
  */
 float CDECL rintf(float x)
 {
-    return unix_funcs->rintf(x);
+    static const float toint = 1 / FLT_EPSILON;
+
+    unsigned int ix = *(unsigned int*)&x;
+    int e = ix >> 23 & 0xff;
+    int s = ix >> 31;
+    float y;
+
+    if (e >= 0x7f + 23)
+        return x;
+    if (s)
+        y = fp_barrierf(x - toint) + toint;
+    else
+        y = fp_barrierf(x + toint) - toint;
+    if (y == 0)
+        return s ? -0.0f : 0.0f;
+    return y;
 }
 
 /*********************************************************************

dlls/msvcrt/unixlib.c

@@ -730,18 +730,6 @@ static float CDECL unix_remquof(float x, float y, int *quo)
 }
 
 /*********************************************************************
- *      rintf
- */
-static float CDECL unix_rintf(float x)
-{
-#ifdef HAVE_RINTF
-    return rintf(x);
-#else
-    return x >= 0 ? floorf(x + 0.5) : ceilf(x - 0.5);
-#endif
-}
-
-/*********************************************************************
  *      sin
  */
 static double CDECL unix_sin( double x )
@@ -922,7 +910,6 @@ static const struct unix_funcs funcs =
     unix_remainderf,
     unix_remquo,
     unix_remquof,
-    unix_rintf,
     unix_sin,
     unix_sinf,
     unix_sinh,

dlls/msvcrt/unixlib.h

@@ -88,7 +88,6 @@ struct unix_funcs
     float           (CDECL *remainderf)(float x, float y);
     double          (CDECL *remquo)(double x, double y, int *quo);
     float           (CDECL *remquof)(float x, float y, int *quo);
-    float           (CDECL *rintf)(float x);
     double          (CDECL *sin)(double x);
     float           (CDECL *sinf)(float x);
     double          (CDECL *sinh)(double x);

include/config.h.in

@@ -684,9 +684,6 @@
 /* Define to 1 if you have the `res_getservers' function. */
 #undef HAVE_RES_GETSERVERS
 
-/* Define to 1 if you have the `rintf' function. */
-#undef HAVE_RINTF
-
 /* Define to 1 if you have the <sasl/sasl.h> header file. */
 #undef HAVE_SASL_SASL_H