math: test for pos/neg zero return of Ceil/Floor/Trunc

Ceil and Trunc of -0.2 return -0, not +0, but we didn't test that.

Updates #23647

Change-Id: Idbd4699376abfb4ca93f16c73c114d610d86a9f2
Reviewed-on: https://go-review.googlesource.com/91335
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/src/math/all_test.go b/src/math/all_test.go
index bcc20a391768087ec7f0b433415fbd8a9f78d954..00f2058ea68b130a3491237eb075753815de582c 100644 (file)
--- a/src/math/all_test.go
+++ b/src/math/all_test.go
@@ -128,7 +128,7 @@ var cbrt = []float64{
 var ceil = []float64{
        5.0000000000000000e+00,
        8.0000000000000000e+00,
-       0.0000000000000000e+00,
+       Copysign(0, -1),
        -5.0000000000000000e+00,
        1.0000000000000000e+01,
        3.0000000000000000e+00,
@@ -644,7 +644,7 @@ var tanh = []float64{
 var trunc = []float64{
        4.0000000000000000e+00,
        7.0000000000000000e+00,
-       -0.0000000000000000e+00,
+       Copysign(0, -1),
        -5.0000000000000000e+00,
        9.0000000000000000e+00,
        2.0000000000000000e+00,
@@ -2158,7 +2158,7 @@ func TestCbrt(t *testing.T) {
 
 func TestCeil(t *testing.T) {
        for i := 0; i < len(vf); i++ {
-               if f := Ceil(vf[i]); ceil[i] != f {
+               if f := Ceil(vf[i]); !alike(ceil[i], f) {
                        t.Errorf("Ceil(%g) = %g, want %g", vf[i], f, ceil[i])
                }
        }
@@ -2385,7 +2385,7 @@ func TestDim(t *testing.T) {
 
 func TestFloor(t *testing.T) {
        for i := 0; i < len(vf); i++ {
-               if f := Floor(vf[i]); floor[i] != f {
+               if f := Floor(vf[i]); !alike(floor[i], f) {
                        t.Errorf("Floor(%g) = %g, want %g", vf[i], f, floor[i])
                }
        }
@@ -2916,7 +2916,7 @@ func TestTanh(t *testing.T) {
 
 func TestTrunc(t *testing.T) {
        for i := 0; i < len(vf); i++ {
-               if f := Trunc(vf[i]); trunc[i] != f {
+               if f := Trunc(vf[i]); !alike(trunc[i], f) {
                        t.Errorf("Trunc(%g) = %g, want %g", vf[i], f, trunc[i])
                }
        }