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refine precision limits on unsafe_math (#3589)

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Alex Lam S.L 2019-11-17 01:16:42 +08:00 committed by GitHub
parent 552be61c4d
commit d1b2ecec27
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2 changed files with 16 additions and 1 deletions
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3
lib/compress.js
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@ -2953,7 +2953,8 @@ merge(Compressor.prototype, {
&& typeof result == "number" && typeof result == "number"
&& (this.operator == "+" || this.operator == "-")) { && (this.operator == "+" || this.operator == "-")) {
var digits = Math.max(0, decimals(left), decimals(right)); var digits = Math.max(0, decimals(left), decimals(right));
if (digits < 21) return +result.toFixed(digits); // 53-bit significand => 15.95 decimal places
if (digits < 16) return +result.toFixed(digits);
} }
return result; return result;

14
test/compress/numbers.js
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@ -917,3 +917,17 @@ issue_3547_4: {
"number 0", "number 0",
] ]
} }
unsafe_math_rounding: {
options = {
evaluate: true,
unsafe_math: true,
}
input: {
console.log(4 / -3 + 1 === 1 / -3);
}
expect: {
console.log(false);
}
expect_stdout: "false"
}