From a67292f20f5248f6a189622c9d0e858942659789 Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Fri, 11 Feb 2011 16:06:04 -0800
Subject: [PATCH] strconv/ftoa: avoid a double shift. (shifts by variables are
 expensive.)

R=rsc, gri, r2
CC=golang-dev
https://golang.org/cl/4169048
---
 src/pkg/strconv/ftoa.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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)