diff --git a/mozilla/js/ref/jsinterp.c b/mozilla/js/ref/jsinterp.c
index 0bc14265b9d..b77db742adb 100644
--- a/mozilla/js/ref/jsinterp.c
+++ b/mozilla/js/ref/jsinterp.c
@@ -1118,7 +1118,7 @@ js_Interpret(JSContext *cx, jsval *result)
 
 #if JS_HAS_SWITCH_STATEMENT
 	  case JSOP_DEFAULT:
-	    POP();
+	    (void) POP();
 	    /* fall through */
 #endif
 	  case JSOP_GOTO:
@@ -1661,7 +1661,7 @@ js_Interpret(JSContext *cx, jsval *result)
 #if JS_HAS_SWITCH_STATEMENT
 	  case JSOP_CASE:
 	    NEW_EQUALITY_OP(==, JS_FALSE);
-	    POP();
+	    (void) POP();
 	    if (cond) {
 		len = GET_JUMP_OFFSET(pc);
 		CHECK_BRANCH(len);
@@ -1848,7 +1848,16 @@ js_Interpret(JSContext *cx, jsval *result)
 
 	  case JSOP_NEG:
 	    POP_NUMBER(cx, d);
+#ifdef HPUX
+            /* 
+             * Negation of a zero doesn't produce a negative
+             * zero on HPUX. Perform the operation by bit
+             * twiddling.
+             */
+            JSDOUBLE_HI32(d) ^= JSDOUBLE_HI32_SIGNBIT;
+#else
 	    d = -d;
+#endif
 	    PUSH_NUMBER(cx, d);
 	    break;
 
diff --git a/mozilla/js/ref/jsnum.c b/mozilla/js/ref/jsnum.c
index 41b70262a17..45249ebca59 100644
--- a/mozilla/js/ref/jsnum.c
+++ b/mozilla/js/ref/jsnum.c
@@ -653,6 +653,16 @@ js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp)
 		d = *cx->runtime->jsPositiveInfinity;
 	    else if (d == -HUGE_VAL)
 		d = *cx->runtime->jsNegativeInfinity;
+#ifdef HPUX
+        if (d == 0.0 && negative) {
+            /* 
+             * "-0", "-1e-2000" come out as positive zero
+    		 * here on HPUX. Force a negative zero instead.
+             */
+            JSDOUBLE_HI32(d) = JSDOUBLE_HI32_SIGNBIT;
+            JSDOUBLE_LO32(d) = 0;
+        }
+#endif
     }
 
     free(cstr);
diff --git a/mozilla/js/ref/jsparse.c b/mozilla/js/ref/jsparse.c
index 456bf57ee9a..fb639500ab4 100644
--- a/mozilla/js/ref/jsparse.c
+++ b/mozilla/js/ref/jsparse.c
@@ -2704,7 +2704,16 @@ js_FoldConstants(JSContext *cx, JSParseNode *pn)
 		break;
 
 	      case JSOP_NEG:
-		d = -d;
+#ifdef HPUX
+                /* 
+                 * Negation of a zero doesn't produce a negative
+                 * zero on HPUX. Perform the operation by bit
+                 * twiddling.
+                 */
+                JSDOUBLE_HI32(d) ^= JSDOUBLE_HI32_SIGNBIT;
+#else
+                d = -d;
+#endif
 		break;
 
 	      case JSOP_POS: