diff options
Diffstat (limited to 'tools/js-optimizer.js')
| -rw-r--r-- | tools/js-optimizer.js | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/js-optimizer.js b/tools/js-optimizer.js index 12754bb2..efbfa8aa 100644 --- a/tools/js-optimizer.js +++ b/tools/js-optimizer.js @@ -486,6 +486,17 @@ function simplifyExpressionsPre(ast) { } } }); + + if (asm) { + // optimize num >> num, in asm we need this here since we do not run optimizeShifts + traverseGenerated(ast, function(node, type) { + if (type == 'binary' && node[1] == '>>' && node[2][0] == 'num' && node[3][0] == 'num') { + node[0] = 'num'; + node[1] = node[2][1] >> node[3][1]; + node.length = 2; + } + }); + } } // The most common mathop is addition, e.g. in getelementptr done repeatedly. We can join all of those, @@ -1653,7 +1664,7 @@ function registerize(ast) { // In memSafe mode, we are more careful and assume functions can replace HEAP and FUNCTION_TABLE, which // can happen in ALLOW_MEMORY_GROWTH mode -var ELIMINATION_SAFE_NODES = set('var', 'assign', 'call', 'if', 'toplevel', 'do', 'return'); // do is checked carefully, however +var ELIMINATION_SAFE_NODES = set('var', 'assign', 'call', 'if', 'toplevel', 'do', 'return', 'label'); // do is checked carefully, however var NODES_WITHOUT_ELIMINATION_SIDE_EFFECTS = set('name', 'num', 'string', 'binary', 'sub', 'unary-prefix'); var IGNORABLE_ELIMINATOR_SCAN_NODES = set('num', 'toplevel', 'string', 'break', 'continue', 'dot'); // dot can only be STRING_TABLE.* var ABORTING_ELIMINATOR_SCAN_NODES = set('new', 'object', 'function', 'defun', 'switch', 'for', 'while', 'array', 'throw'); // we could handle some of these, TODO, but nontrivial (e.g. for while, the condition is hit multiple times after the body) |