libgo: update to Go 1.8 release candidate 1

    
    Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.
    
    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.
    
    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.

From-SVN: r244456

1 files changed, 44 insertions, 3 deletions

diff --git a/libgo/go/math/big/float_test.go b/libgo/go/math/big/float_test.go
index 464619b..7d4bd31 100644
--- a/libgo/go/math/big/float_test.go
+++ b/libgo/go/math/big/float_test.go
@@ -5,6 +5,7 @@
 package big
 
 import (
+	"flag"
 	"fmt"
 	"math"
 	"strconv"
@@ -1495,12 +1496,14 @@ func TestFloatQuo(t *testing.T) {
 	}
 }
 
+var long = flag.Bool("long", false, "run very long tests")
+
 // TestFloatQuoSmoke tests all divisions x/y for values x, y in the range [-n, +n];
 // it serves as a smoke test for basic correctness of division.
 func TestFloatQuoSmoke(t *testing.T) {
-	n := 1000
-	if testing.Short() {
-		n = 10
+	n := 10
+	if *long {
+		n = 1000
 	}
 
 	const dprec = 3         // max. precision variation
@@ -1762,3 +1765,41 @@ func TestFloatCmpSpecialValues(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkFloatAdd(b *testing.B) {
+	x := new(Float)
+	y := new(Float)
+	z := new(Float)
+
+	for _, prec := range []uint{10, 1e2, 1e3, 1e4, 1e5} {
+		x.SetPrec(prec).SetRat(NewRat(1, 3))
+		y.SetPrec(prec).SetRat(NewRat(1, 6))
+		z.SetPrec(prec)
+
+		b.Run(fmt.Sprintf("%v", prec), func(b *testing.B) {
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				z.Add(x, y)
+			}
+		})
+	}
+}
+
+func BenchmarkFloatSub(b *testing.B) {
+	x := new(Float)
+	y := new(Float)
+	z := new(Float)
+
+	for _, prec := range []uint{10, 1e2, 1e3, 1e4, 1e5} {
+		x.SetPrec(prec).SetRat(NewRat(1, 3))
+		y.SetPrec(prec).SetRat(NewRat(1, 6))
+		z.SetPrec(prec)
+
+		b.Run(fmt.Sprintf("%v", prec), func(b *testing.B) {
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				z.Sub(x, y)
+			}
+		})
+	}
+}