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authorAlex Lam S.L <alexlamsl@gmail.com>2019-11-17 01:16:42 +0800
committerGitHub <noreply@github.com>2019-11-17 01:16:42 +0800
commitd1b2ecec27ea17e42d504503c6d760ff3c67b9ad (patch)
treed83a95a4721336282be5d24b6d06c80fbaa9d5c6
parent552be61c4d6756fb31675fee0b1284e23d5d8721 (diff)
downloadtracifyjs-d1b2ecec27ea17e42d504503c6d760ff3c67b9ad.tar.gz
tracifyjs-d1b2ecec27ea17e42d504503c6d760ff3c67b9ad.zip
refine precision limits on `unsafe_math` (#3589)
-rw-r--r--lib/compress.js3
-rw-r--r--test/compress/numbers.js14
2 files changed, 16 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js
index f82a165e..9366091c 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2953,7 +2953,8 @@ merge(Compressor.prototype, {
&& typeof result == "number"
&& (this.operator == "+" || this.operator == "-")) {
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;
diff --git a/test/compress/numbers.js b/test/compress/numbers.js
index cbb2863f..ee20fc15 100644
--- a/test/compress/numbers.js
+++ b/test/compress/numbers.js
@@ -917,3 +917,17 @@ issue_3547_4: {
"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"
+}