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[thirdparty/glibc.git] / sysdeps / aarch64 / fpu / s_lrint.c

diff --git a/sysdeps/aarch64/fpu/s_lrint.c b/sysdeps/aarch64/fpu/s_lrint.c
index c45c070cb017e65b30e9784c32272f69f48ee8b0..885cc086b6aa17b144f138e8f12843abac6ba651 100644 (file)
--- a/sysdeps/aarch64/fpu/s_lrint.c
+++ b/sysdeps/aarch64/fpu/s_lrint.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
 
    This file is part of the GNU C Library.
 
@@ -14,40 +14,75 @@
 
    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
+   <https://www.gnu.org/licenses/>.  */
 
 #include <math.h>
+#include <get-rounding-mode.h>
+#include <stdint.h>
+#include <math-barriers.h>
+#include <libm-alias-double.h>
 
-#ifndef FUNC
-# define FUNC lrint
-#endif
+# define IREG_SIZE 64
+
+# ifdef __ILP32__
+#  define OREG_SIZE 32
+# else
+#  define OREG_SIZE 64
+# endif
 
-#ifndef ITYPE
-# define ITYPE double
 # define IREGS "d"
+
+#if OREG_SIZE == 32
+# define OREGS "w"
 #else
-# ifndef IREGS
-#  error IREGS not defined
-# endif
+# define OREGS "x"
 #endif
 
-#ifndef OTYPE
-# define OTYPE long int
+
+long int
+__lrint (double x)
+{
+
+#if IREG_SIZE == 64 && OREG_SIZE == 32
+  long int result;
+
+  if (__builtin_fabs (x) > INT32_MAX)
+    {
+      /* Converting large values to a 32 bit int may cause the frintx/fcvtza
+        sequence to set both FE_INVALID and FE_INEXACT.  To avoid this
+        check the rounding mode and do a single instruction with the
+        appropriate rounding mode.  */
+
+      switch (get_rounding_mode ())
+       {
+       case FE_TONEAREST:
+         asm volatile ("fcvtns" "\t%" OREGS "0, %" IREGS "1"
+                       : "=r" (result) : "w" (x));
+         break;
+       case FE_UPWARD:
+         asm volatile ("fcvtps" "\t%" OREGS "0, %" IREGS "1"
+                       : "=r" (result) : "w" (x));
+         break;
+       case FE_DOWNWARD:
+         asm volatile ("fcvtms" "\t%" OREGS "0, %" IREGS "1"
+                       : "=r" (result) : "w" (x));
+         break;
+       case FE_TOWARDZERO:
+       default:
+         asm volatile ("fcvtzs" "\t%" OREGS "0, %" IREGS "1"
+                       : "=r" (result) : "w" (x));
+       }
+      return result;
+    }
 #endif
 
-#define OREGS "x"
+  double r =  __builtin_rint (x);
 
-#define __CONCATX(a,b) __CONCAT(a,b)
+  /* Prevent gcc from calling lrint directly when compiled with
+     -fno-math-errno by inserting a barrier.  */
 
-OTYPE
-__CONCATX(__,FUNC) (ITYPE x)
-{
-  OTYPE result;
-  ITYPE temp;
-  asm ( "frintx" "\t%" IREGS "1, %" IREGS "2\n\t"
-        "fcvtzs" "\t%" OREGS "0, %" IREGS "1"
-        : "=r" (result), "=w" (temp) : "w" (x) );
-  return result;
+  math_opt_barrier (r);
+  return r;
 }
 
-weak_alias (__CONCATX(__,FUNC), FUNC)
+libm_alias_double (__lrint, lrint)