Generated code for substring slices in ia32.

test/mjsunit/string-slices.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 54 matching lines @@
 
 
 // Test substrings of different lengths and alignments.
 // First ASCII.
 var x = "ASCII";
 for (var i = 0; i < 25; i++) {
   x += (i >> 4).toString(16) + (i & 0x0f).toString(16);
 }
 /x/.exec(x);  // Try to force a flatten.
 for (var i = 5; i < 25; i++) {
-  for (var j = 12; j < 25; j++) {
+  for (var j = 0; j < 25; j++) {
     var z = x.substring(i, i+j);
     var w = Math.random() * 42;  // Allocate something new in new-space.
     assertEquals(j, z.length);
     for (var k = 0; k < j; k++) {
       assertEquals(x.charAt(i+k), z.charAt(k));
     }
   }
 }
 // Then two-byte strings.
 x = "UC16\u2028";  // Non-ascii char forces two-byte string.
@@ skipping 17 matching lines @@
 x += x;  // 2^5
 x += x;
 x += x;
 x += x;
 x += x;
 x += x;  // 2^10
 x += x;
 x += x;
 var xl = x.length;
 var cache = [];
-for (var i = 0; i < 10000; i++) {
+for (var i = 0; i < 1000; i++) {
   var z = x.substring(i % xl);
   assertEquals(xl - (i % xl), z.length);
   cache.push(z);
 }
 
 
 // Same with two-byte strings
 var x = "\u2028123456789ABCDEF";
 x += x;  // 2^5
 x += x;
 x += x;
 x += x;
 x += x;
 x += x;  // 2^10
 x += x;
 x += x;
 var xl = x.length;
 var cache = [];
-for (var i = 0; i < 10000; i++) {
+for (var i = 0; i < 1000; i++) {
   var z = x.substring(i % xl);
   assertEquals(xl - (i % xl), z.length);
   cache.push(z);
 }
 
 // Substring of substring.
 var cache = [];
 var last = x;
 var offset = 0;
 for (var i = 0; i < 64; i++) {
   var z = last.substring(i);
   last = z;
   cache.push(z);
   offset += i;
 }
 for (var i = 63; i >= 0; i--) {
   var z = cache.pop();
   assertTrue(/\u2028123456789ABCDEF/.test(z));
   assertEquals(xl - offset, z.length);
+  assertEquals(x.charAt(i*(i+1)/2), z.charAt(0));
   offset -= i;
 }
 
 // Test charAt for different strings.
 function f(s1, s2, s3, i) {
   assertEquals(String.fromCharCode(97+i%11), s1.charAt(i%11));
   assertEquals(String.fromCharCode(97+i%11), s2.charAt(i%11));
   assertEquals(String.fromCharCode(98+i%11), s3.charAt(i%11));
   assertEquals(String.fromCharCode(101), s3.charAt(3));
 }
@@ skipping 27 matching lines @@
     utf.substring(5,1) + utf.substring(3,7));
 
 /*
 // Externalizing strings.
 var a = "123456789qwertyuiopasdfghjklzxcvbnm";
 var b = a.slice(1,-1);
 assertEquals(a.slice(1,-1), b);
 externalizeString(a);
 assertEquals(a.slice(1,-1), b);
 */