From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 31 Mar 2012 03:41:43 +0000 (-0400)
Subject: optimize signbit macro
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=4dbd94112ff74064554054b5ff27a7af547e4899;hp=93a18a15e4428d4fe3f239081e0218ac0c69f458

optimize signbit macro
---

diff --git a/include/math.h b/include/math.h
index 8791bba8..ff62cb7c 100644
--- a/include/math.h
+++ b/include/math.h
@@ -77,8 +77,8 @@ int __signbitf(float);
 int __signbitl(long double);
 
 #define signbit(x) ( \
-	sizeof(x) == sizeof(float) ? !!(__FLOAT_BITS(x) & 0x80000000) : \
-	sizeof(x) == sizeof(double) ? !!(__DOUBLE_BITS(x) & (__uint64_t)1<<63) : \
+	sizeof(x) == sizeof(float) ? (int)(__FLOAT_BITS(x)>>31) : \
+	sizeof(x) == sizeof(double) ? (int)(__DOUBLE_BITS(x)>>63) : \
 	__signbitl(x) )
 
 #define isunordered(x,y) (isnan((x)) ? ((void)(y),1) : isnan((y)))