Use doubleToRawLongBits for isNegativeZero

chrisseaton · chrisseaton · commit ddd2cf9a138a · 2019-06-18T12:05:56.000+01:00
diff --git a/src/main/java/org/truffleruby/language/RubyGuards.java b/src/main/java/org/truffleruby/language/RubyGuards.java
@@ -16,6 +16,8 @@
 
 public abstract class RubyGuards {
 
+    private static final long NEGATIVE_ZERO_DOUBLE_BITS = Double.doubleToRawLongBits(-0.0);
+
     // Basic Java types
 
     public static boolean isBoolean(Object value) {
@@ -323,7 +325,7 @@ public static boolean isPositive(double value) {
     }
 
     public static boolean isNegativeZero(double value) {
-        return Double.valueOf(value).equals(-0.0);
+        return Double.doubleToRawLongBits(value) == NEGATIVE_ZERO_DOUBLE_BITS;
     }
 
     // Composite

Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,8 @@`
`16`	`16`
`17`	`17`	`public abstract class RubyGuards {`
`18`	`18`
	`19`	`+ private static final long NEGATIVE_ZERO_DOUBLE_BITS = Double.doubleToRawLongBits(-0.0);`
	`20`	`+`
`19`	`21`	`// Basic Java types`
`20`	`22`
`21`	`23`	`public static boolean isBoolean(Object value) {`
`@@ -323,7 +325,7 @@ public static boolean isPositive(double value) {`
`323`	`325`	`}`
`324`	`326`
`325`	`327`	`public static boolean isNegativeZero(double value) {`
`326`		`- return Double.valueOf(value).equals(-0.0);`
	`328`	`+ return Double.doubleToRawLongBits(value) == NEGATIVE_ZERO_DOUBLE_BITS;`
`327`	`329`	`}`
`328`	`330`
`329`	`331`	`// Composite`