From: Rob Pike <r@golang.org>
Date: Sat, 12 Feb 2011 00:06:04 +0000 (-0800)
Subject: strconv/ftoa: avoid a double shift. (shifts by variables are expensive.)
X-Git-Tag: weekly.2011-02-15~16
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=a67292f20f5248f6a189622c9d0e858942659789;p=gostls13.git

strconv/ftoa: avoid a double shift. (shifts by variables are expensive.)

R=rsc, gri, r2
CC=golang-dev
https://golang.org/cl/4169048
---

diff --git a/src/pkg/strconv/ftoa.go b/src/pkg/strconv/ftoa.go
index 4ec3cdbb97..b6049c5458 100644
--- a/src/pkg/strconv/ftoa.go
+++ b/src/pkg/strconv/ftoa.go
@@ -64,7 +64,7 @@ func FtoaN(f float64, fmt byte, prec int, n int) string {
 }
 
 func genericFtoa(bits uint64, fmt byte, prec int, flt *floatInfo) string {
-	neg := bits>>flt.expbits>>flt.mantbits != 0
+	neg := bits>>(flt.expbits+flt.mantbits) != 0
 	exp := int(bits>>flt.mantbits) & (1<<flt.expbits - 1)
 	mant := bits & (uint64(1)<<flt.mantbits - 1)