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improve unused (#1832)

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- extract leading value with side-effects out of `var` statement
- reduce scanning of `AST_Definitions` from 3 passes to just once
This commit is contained in:
Alex Lam S.L
2017-04-20 13:06:14 +08:00
committed by GitHub
parent 88e7a542cd
commit f05d4f7af3
4 changed files with 82 additions and 105 deletions
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6
test/compress/collapse_vars.js
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@@ -701,10 +701,10 @@ collapse_vars_lvalues_drop_assign: {
function f2(x) { var z = x, a = ++z; return z += a; }
function f3(x) { var a = (x -= 3); return x + a; }
function f4(x) { var a = (x -= 3); return x + a; }
function f5(x) { var v = (e1(), e2()), c = v = --x; return x - c; }
function f5(x) { e1(); var v = e2(), c = v = --x; return x - c; }
function f6(x) { e1(), e2(); return --x - x; }
function f7(x) { var c = (e1(), e2() - x); return x - c; }
function f8(x) { var v = (e1(), e2()); return x - (v - x); }
function f7(x) { e1(); var c = e2() - x; return x - c; }
function f8(x) { e1(); var v = e2(); return x - (v - x); }
function f9(x) { e1(); return e2() - x - x; }
}
}