From e49ecaed57181c10bf01e1f84b9eead65a759386 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 3 May 2020 14:38:19 +0900
Subject: Optimize sin/cos

GCC/Clang can optimize to calculate `sin(x)` and `cos(x)` at once,
when the both are closely called on the same argument.

Similar optimization is possible for `__sinpi(x)` and `__cospi(x)`
if available, which calculate arguments in radian, i.e.
`sin(x*M_PI)` and `cos(x*M_PI)` respectively.
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index e16c3e44ed..f78eb38c93 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1991,6 +1991,8 @@ AC_CHECK_FUNCS(utimensat)
 AC_CHECK_FUNCS(utimes)
 AC_CHECK_FUNCS(wait4)
 AC_CHECK_FUNCS(waitpid)
+AC_CHECK_FUNCS(__cospi)
+AC_CHECK_FUNCS(__sinpi)
 
 AS_IF([test "x$ac_cv_member_struct_statx_stx_btime" = xyes],
     [AC_CHECK_FUNCS(statx)])
-- 
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