From: Shenghou Ma <minux.ma@gmail.com>
Date: Thu, 10 May 2012 19:09:14 +0000 (+0800)
Subject: runtime: fix complex division benchmarks
X-Git-Tag: go1.1rc2~3222
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=aa45e52e74f37e39a5a8234071742d50b87b7b2c;p=gostls13.git

runtime: fix complex division benchmarks
we can't add the division result to n during iteration, because it might
turn n into NaN or Inf.

R=golang-dev, rsc, iant, iant
CC=golang-dev
https://golang.org/cl/6197045
---

diff --git a/src/pkg/runtime/complex_test.go b/src/pkg/runtime/complex_test.go
index ebe2d59124..f41e6a3570 100644
--- a/src/pkg/runtime/complex_test.go
+++ b/src/pkg/runtime/complex_test.go
@@ -14,44 +14,54 @@ var result complex128
 func BenchmarkComplex128DivNormal(b *testing.B) {
 	d := 15 + 2i
 	n := 32 + 3i
+	res := 0i
 	for i := 0; i < b.N; i++ {
-		n += n / d
+		n += 0.1i
+		res += n / d
 	}
-	result = n
+	result = res
 }
 
 func BenchmarkComplex128DivNisNaN(b *testing.B) {
 	d := cmplx.NaN()
 	n := 32 + 3i
+	res := 0i
 	for i := 0; i < b.N; i++ {
-		n += n / d
+		n += 0.1i
+		res += n / d
 	}
-	result = n
+	result = res
 }
 
 func BenchmarkComplex128DivDisNaN(b *testing.B) {
 	d := 15 + 2i
 	n := cmplx.NaN()
+	res := 0i
 	for i := 0; i < b.N; i++ {
-		n += n / d
+		d += 0.1i
+		res += n / d
 	}
-	result = n
+	result = res
 }
 
 func BenchmarkComplex128DivNisInf(b *testing.B) {
 	d := 15 + 2i
 	n := cmplx.Inf()
+	res := 0i
 	for i := 0; i < b.N; i++ {
-		n += n / d
+		d += 0.1i
+		res += n / d
 	}
-	result = n
+	result = res
 }
 
 func BenchmarkComplex128DivDisInf(b *testing.B) {
 	d := cmplx.Inf()
 	n := 32 + 3i
+	res := 0i
 	for i := 0; i < b.N; i++ {
-		n += n / d
+		n += 0.1i
+		res += n / d
 	}
-	result = n
+	result = res
 }