diff --git a/lib/compiler/passes/generate-code.js b/lib/compiler/passes/generate-code.js
index 3faf8f2..79e5b97 100644
--- a/lib/compiler/passes/generate-code.js
+++ b/lib/compiler/passes/generate-code.js
@@ -334,6 +334,8 @@ module.exports = function(ast, options) {
             '      ',
             '      var pos = 0;',
             '      var reportedPos = 0;',
+            '      var cachedReportedPos = 0;',
+            '      var cachedReportedPosDetails = { line: 1, column: 1, seenCR: false };',
             '      var reportFailures = 0;', // 0 = report, anything > 0 = do not report
             '      var rightmostFailuresPos = 0;',
             '      var rightmostFailuresExpected = [];',
@@ -370,16 +372,48 @@ module.exports = function(ast, options) {
             '        return \'\\\\\' + escapeChar + padLeft(charCode.toString(16).toUpperCase(), \'0\', length);',
             '      }',
             '      ',
+            '      function computeReportedPosDetails() {',
+            '        function advanceCachedReportedPos() {',
+            '          var ch;',
+            '          ',
+            '          for (; cachedReportedPos < reportedPos; cachedReportedPos++) {',
+            '            ch = input.charAt(cachedReportedPos);',
+            '            if (ch === "\\n") {',
+            '              if (!cachedReportedPosDetails.seenCR) { cachedReportedPosDetails.line++; }',
+            '              cachedReportedPosDetails.column = 1;',
+            '              cachedReportedPosDetails.seenCR = false;',
+            '            } else if (ch === "\\r" || ch === "\\u2028" || ch === "\\u2029") {',
+            '              cachedReportedPosDetails.line++;',
+            '              cachedReportedPosDetails.column = 1;',
+            '              cachedReportedPosDetails.seenCR = true;',
+            '            } else {',
+            '              cachedReportedPosDetails.column++;',
+            '              cachedReportedPosDetails.seenCR = false;',
+            '            }',
+            '          }',
+            '        }',
+            '        ',
+            '        if (cachedReportedPos !== reportedPos) {',
+            '          if (cachedReportedPos > reportedPos) {',
+            '            cachedReportedPos = 0;',
+            '            cachedReportedPosDetails = { line: 1, column: 1, seenCR: false };',
+            '          }',
+            '          advanceCachedReportedPos();',
+            '        }',
+            '        ',
+            '        return cachedReportedPosDetails;',
+            '      }',
+            '      ',
             '      function offset() {',
             '        return reportedPos;',
             '      }',
             '      ',
             '      function line() {',
-            '        return computePosDetails(reportedPos).line;',
+            '        return computeReportedPosDetails().line;',
             '      }',
             '      ',
             '      function column() {',
-            '        return computePosDetails(reportedPos).column;',
+            '        return computeReportedPosDetails().column;',
             '      }',
             '      ',
             '      function matchFailed(failure) {',
@@ -414,37 +448,6 @@ module.exports = function(ast, options) {
             '        return cleanExpected;',
             '      }',
             '      ',
-            '      function computePosDetails(pos) {',
-            '        /*',
-            '         * The first idea was to use |String.split| to break the input up to the',
-            '         * error position along newlines and derive the line and column from',
-            '         * there. However IE\'s |split| implementation is so broken that it was',
-            '         * enough to prevent it.',
-            '         */',
-            '        ',
-            '        var line = 1;',
-            '        var column = 1;',
-            '        var seenCR = false;',
-            '        ',
-            '        for (var i = 0; i < pos; i++) {',
-            '          var ch = input.charAt(i);',
-            '          if (ch === "\\n") {',
-            '            if (!seenCR) { line++; }',
-            '            column = 1;',
-            '            seenCR = false;',
-            '          } else if (ch === "\\r" || ch === "\\u2028" || ch === "\\u2029") {',
-            '            line++;',
-            '            column = 1;',
-            '            seenCR = true;',
-            '          } else {',
-            '            column++;',
-            '            seenCR = false;',
-            '          }',
-            '        }',
-            '        ',
-            '        return { line: line, column: column };',
-            '      }',
-            '      ',
             '      #if node.initializer',
             '        #block emit(node.initializer)',
             '      #end',
@@ -476,16 +479,16 @@ module.exports = function(ast, options) {
             '       * handle these states.',
             '       */',
             '      if (result === null || pos !== input.length) {',
-            '        var offset = Math.max(pos, rightmostFailuresPos);',
-            '        var found = offset < input.length ? input.charAt(offset) : null;',
-            '        var errorPosition = computePosDetails(Math.max(pos, rightmostFailuresPos));',
+            '        reportedPos = Math.max(pos, rightmostFailuresPos);',
+            '        var found = reportedPos < input.length ? input.charAt(reportedPos) : null;',
+            '        var reportedPosDetails = computeReportedPosDetails();',
             '        ',
             '        throw new this.SyntaxError(',
             '          cleanupExpected(rightmostFailuresExpected),',
             '          found,',
-            '          offset,',
-            '          errorPosition.line,',
-            '          errorPosition.column',
+            '          reportedPos,',
+            '          reportedPosDetails.line,',
+            '          reportedPosDetails.column',
             '        );',
             '      }',
             '      ',