From eb9066203f6e07128d42f771def4b7ad37b25dc1 Mon Sep 17 00:00:00 2001
From: Shen-Ta Hsieh <ibmibmibm.tw@gmail.com>
Date: Mon, 24 May 2021 09:43:12 +0800
Subject: Use GCC builtins for roundeven functions if desired.

This patch is using the corresponding GCC builtin for roundevenf,
roundeven and roundevenl if the USE_FUNCTION_BUILTIN macros are defined
to one in math-use-builtins.h.

These builtin functions is supported since GCC 10.

The code of the generic implementation is not changed.

Signed-off-by: Shen-Ta Hsieh <ibmibmibm.tw@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
---
 sysdeps/ieee754/flt-32/s_roundevenf.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'sysdeps/ieee754/flt-32')

diff --git a/sysdeps/ieee754/flt-32/s_roundevenf.c b/sysdeps/ieee754/flt-32/s_roundevenf.c
index 2cc0d7b001..4f568579d8 100644
--- a/sysdeps/ieee754/flt-32/s_roundevenf.c
+++ b/sysdeps/ieee754/flt-32/s_roundevenf.c
@@ -21,6 +21,7 @@
 #include <math.h>
 #include <math_private.h>
 #include <libm-alias-float.h>
+#include <math-use-builtins.h>
 #include <stdint.h>
 
 #define BIAS 0x7f
@@ -30,6 +31,9 @@
 float
 __roundevenf (float x)
 {
+#if USE_ROUNDEVENF_BUILTIN
+  return __builtin_roundevenf (x);
+#else
   uint32_t ix, ux;
   GET_FLOAT_WORD (ix, x);
   ux = ix & 0x7fffffff;
@@ -67,6 +71,7 @@ __roundevenf (float x)
     ix &= 0x80000000;
   SET_FLOAT_WORD (x, ix);
   return x;
+#endif /* ! USE_ROUNDEVENF_BUILTIN  */
 }
 #ifndef __roundevenf
 libm_alias_float (__roundeven, roundeven)
-- 
cgit 1.4.1