Make strconv.atof("-0") return -0

and update test.

R=iant
DELTA=11  (3 added, 1 deleted, 7 changed)
OCL=20350
CL=20362

src/lib/strconv/atof.go

@@ -110,14 +110,16 @@ var powtab = []int{
 }
 
 func DecimalToFloatBits(neg bool, d *Decimal, trunc bool, flt *FloatInfo) (b uint64, overflow bool) {
+	var exp int;
+	var mant uint64;
+
 	// Zero is always a special case.
 	if d.nd == 0 {
-		return 0, false
+		mant = 0;
+		exp = flt.bias;
+		goto out;
 	}
 
-	var exp int;
-	var mant uint64;
-
 	// Obvious overflow/underflow.
 	// These bounds are for 64-bit floats.
 	// Will have to change if we want to support 80-bit floats in the future.
@@ -212,7 +214,7 @@ func DecimalToFloat64Int(neg bool, d *Decimal) float64 {
 		f = f*10 + float64(d.d[i] - '0');
 	}
 	if neg {
-		f = -f;
+		f *= -1;	// BUG work around 6g f = -f.
 	}
 	return f;
 }
@@ -223,7 +225,7 @@ func DecimalToFloat32Int(neg bool, d *Decimal) float32 {
 		f = f*10 + float32(d.d[i] - '0');
 	}
 	if neg {
-		f = -f;
+		f *= -1;	// BUG work around 6g f = -f.
 	}
 	return f;
 }

src/lib/strconv/atof_test.go

@@ -32,7 +32,7 @@ var tests = []Test {
 	Test{ "100000000000000016777215", "1.0000000000000001e+23", nil },
 	Test{ "100000000000000016777216", "1.0000000000000003e+23", nil },
 	Test{ "-1", "-1", nil },
-	Test{ "-0", "0", nil },
+	Test{ "-0", "-0", nil },
 	Test{ "1e-20", "1e-20", nil },
 	Test{ "625e-3", "0.625", nil },