From a32e087d07257bb5754ebde4a92d5cb6fc4e3fdf Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Tue, 29 Aug 2017 00:36:17 -0400
Subject: [PATCH] stdlib: An implementation of SDL_scalbn using ldexp()
 (thanks, Ozkan!).

Fixes Bugzilla #3767.

--HG--
extra : rebase_source : c8dfcbc036ca99ce20808a33204cd87ae9b3e4d2
---
 src/stdlib/SDL_stdlib.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/stdlib/SDL_stdlib.c b/src/stdlib/SDL_stdlib.c
index 194298d3c..36b554857 100644
--- a/src/stdlib/SDL_stdlib.c
+++ b/src/stdlib/SDL_stdlib.c
@@ -187,6 +187,10 @@ SDL_scalbn(double x, int n)
     return scalbn(x, n);
 #elif defined(HAVE__SCALB)
     return _scalb(x, n);
+#elif defined(HAVE_LIBC) && defined(HAVE_FLOAT_H) && (FLT_RADIX == 2)
+/* from scalbn(3): If FLT_RADIX equals 2 (which is
+ * usual), then scalbn() is equivalent to ldexp(3). */
+    return ldexp(x, n);
 #else
     return SDL_uclibc_scalbn(x, n);
 #endif /* HAVE_SCALBN */