Cleanup rint() portability checks

cmake/os/WindowsCache.cmake

@@ -139,7 +139,6 @@ SET(HAVE_READLINK CACHE  INTERNAL "")
 SET(HAVE_READ_REAL_TIME CACHE  INTERNAL "")
 SET(HAVE_REALPATH CACHE  INTERNAL "")
 SET(HAVE_RENAME 1 CACHE  INTERNAL "")
-#SET(HAVE_RINT CACHE  INTERNAL "")
 SET(HAVE_RWLOCK_INIT CACHE  INTERNAL "")
 SET(HAVE_SCHED_H CACHE  INTERNAL "")
 SET(HAVE_SCHED_YIELD CACHE  INTERNAL "")

config.h.cmake

@@ -210,7 +210,6 @@
 #cmakedefine HAVE_READLINK 1
 #cmakedefine HAVE_REALPATH 1
 #cmakedefine HAVE_RENAME 1
-#cmakedefine HAVE_RINT 1
 #cmakedefine HAVE_RWLOCK_INIT 1
 #cmakedefine HAVE_SCHED_YIELD 1
 #cmakedefine HAVE_SELECT 1

configure.cmake

@@ -478,7 +478,6 @@ CHECK_SYMBOL_EXISTS(FIONREAD "sys/filio.h" FIONREAD_IN_SYS_FILIO)
 CHECK_SYMBOL_EXISTS(gettimeofday "sys/time.h" HAVE_GETTIMEOFDAY)
 
 CHECK_SYMBOL_EXISTS(log2  math.h HAVE_LOG2)
-CHECK_SYMBOL_EXISTS(rint  math.h HAVE_RINT)
 
 #
 # Test for endianness

include/my_global.h

@@ -1179,41 +1179,6 @@ typedef struct { const char *dli_fname, dli_fbase; } Dl_info;
 #endif
 #endif /* !defined(__func__) */
 
-#ifndef HAVE_RINT
-/**
-   All integers up to this number can be represented exactly as double precision
-   values (DBL_MANT_DIG == 53 for IEEE 754 hardware).
-*/
-#define MAX_EXACT_INTEGER ((1LL << DBL_MANT_DIG) - 1)
-
-/**
-   rint(3) implementation for platforms that do not have it.
-   Always rounds to the nearest integer with ties being rounded to the nearest
-   even integer to mimic glibc's rint() behavior in the "round-to-nearest"
-   FPU mode. Hardware-specific optimizations are possible (frndint on x86).
-   Unlike this implementation, hardware will also honor the FPU rounding mode.
-*/
-
-static inline double rint(double x)
-{
-  double f, i;
-  f = modf(x, &i);
-  /*
-    All doubles with absolute values > MAX_EXACT_INTEGER are even anyway,
-    no need to check it.
-  */
-  if (x > 0.0)
-    i += (double) ((f > 0.5) || (f == 0.5 &&
-                                 i <= (double) MAX_EXACT_INTEGER &&
-                                 (longlong) i % 2));
-  else
-    i -= (double) ((f < -0.5) || (f == -0.5 &&
-                                  i >= (double) -MAX_EXACT_INTEGER &&
-                                  (longlong) i % 2));
-  return i;
-}
-#endif /* HAVE_RINT */
-
 /* 
   MYSQL_PLUGIN_IMPORT macro is used to export mysqld data
   (i.e variables) for usage in storage engine loadable plugins.