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fix corner case in sign propagation (#3696)

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- migrate de-facto functionality to `evaluate`

fixes #3695
This commit is contained in:
Alex Lam S.L
2020-01-28 22:44:18 +08:00
committed by GitHub
parent b499e03f82
commit 87119e44a0
3 changed files with 30 additions and 9 deletions
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19
lib/compress.js
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@@ -6062,6 +6062,8 @@ merge(Compressor.prototype, {
return self;
});
var SIGN_OPS = makePredicate("+ -");
var MULTIPLICATIVE_OPS = makePredicate("* / %");
OPT(AST_UnaryPrefix, function(self, compressor) {
var e = self.expression;
if (compressor.option("evaluate")
@@ -6112,12 +6114,12 @@ merge(Compressor.prototype, {
])).optimize(compressor);
}
}
if (self.operator == "-" && e instanceof AST_Infinity) {
e = e.transform(compressor);
}
if (e instanceof AST_Binary
&& (self.operator == "+" || self.operator == "-")
&& (e.operator == "*" || e.operator == "/" || e.operator == "%")) {
if (self.operator == "-" && e instanceof AST_Infinity) e = e.transform(compressor);
if (compressor.option("evaluate")
&& e instanceof AST_Binary
&& SIGN_OPS[self.operator]
&& MULTIPLICATIVE_OPS[e.operator]
&& (e.left.is_constant() || !e.right.has_side_effects(compressor))) {
return make_node(AST_Binary, self, {
operator: e.operator,
left: make_node(AST_UnaryPrefix, e.left, {
@@ -6387,7 +6389,8 @@ merge(Compressor.prototype, {
if (self.right instanceof AST_Binary
&& self.operator == self.right.operator
&& (self.left.is_string(compressor) && self.right.is_string(compressor)
|| self.right.left.is_string(compressor) && !self.right.right.has_side_effects(compressor))) {
|| self.right.left.is_string(compressor)
&& (self.left.is_constant() || !self.right.right.has_side_effects(compressor)))) {
swap_chain();
}
}
@@ -7084,7 +7087,7 @@ merge(Compressor.prototype, {
return reachable;
}
var ASSIGN_OPS = makePredicate("+ - / * % >> << >>> | ^ &");
var ASSIGN_OPS = makePredicate("+ - * / % >> << >>> | ^ &");
var ASSIGN_OPS_COMMUTATIVE = makePredicate("* | ^ &");
OPT(AST_Assign, function(self, compressor) {
if (compressor.option("dead_code")) {