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util: fix negative 0 check in inspect #17507

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util: fix negative 0 check in inspect #17507

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devsnek
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@devsnek devsnek commented Dec 6, 2017

closes #17500

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

util

@nodejs-github-bot nodejs-github-bot added the util Issues and PRs related to the built-in util module. label Dec 6, 2017
bnoordhuis
bnoordhuis reviewed Dec 6, 2017
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lib/util.js Outdated
@@ -600,7 +600,7 @@ function formatNumber(fn, value) {
// Format -0 as '-0'. A `value === -0` check won't distinguish 0 from -0.
// Using a division check is currently faster than `Object.is(value, -0)`
// as of V8 6.1.
if (1 / value === -Infinity)
if (value === 0 && 1 / value === -Infinity)
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if (Object.is(value, -0))

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@apapirovski apapirovski Dec 6, 2017 •
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The performance concern is real (3x slower for Object.is) but does it really matter in this case? It feels like this might be a micro-optimization too far.

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It got better recently but those changes may not be in 6.3 yet. And yeah, I don't think Object.is() is going to be the expensive part here.

apapirovski
apapirovski approved these changes Dec 6, 2017
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lib/util.js Outdated
@@ -600,7 +600,7 @@ function formatNumber(fn, value) {
// Format -0 as '-0'. A `value === -0` check won't distinguish 0 from -0.
// Using a division check is currently faster than `Object.is(value, -0)`
// as of V8 6.1.
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The comment should be adjusted if this is being changed to Object.is again.

apapirovski
apapirovski reviewed Dec 6, 2017
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lib/util.js Outdated
// Using a division check is currently faster than `Object.is(value, -0)`
// as of V8 6.1.
// `Object.is` is faster as of 6.3, and this code doesn't
// need to be very performant anyway
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Sorry, I was thinking something more along the lines of:

// Format -0 as '-0'. A `value === -0` check won't distinguish 0 from -0.

We don't really need to talk about the performance of it, IMHO.

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alright 😄

BridgeAR
BridgeAR requested changes Dec 7, 2017
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LGTM but we definitely should add a test before landing.

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@BridgeAR would you mind reviewing this? It appears your feedback might've been addressed. Thank you!

@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Dec 8, 2017
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addaleax commented Dec 8, 2017

CI: https://ci.nodejs.org/job/node-test-commit/14686/

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Landed in 86527bd

@apapirovski apapirovski closed this Dec 9, 2017
apapirovski pushed a commit that referenced this pull request Dec 9, 2017
@devsnek @apapirovski
util: fix negative 0 check in inspect
86527bd 
PR-URL: #17507
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@devsnek devsnek deleted the patch-6 branch December 9, 2017 18:06
MylesBorins pushed a commit that referenced this pull request Dec 12, 2017
@devsnek @MylesBorins
util: fix negative 0 check in inspect
74429e7 
PR-URL: #17507
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
MylesBorins pushed a commit that referenced this pull request Dec 12, 2017
@devsnek @MylesBorins
util: fix negative 0 check in inspect
8383c34 
PR-URL: #17507
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@MylesBorins MylesBorins mentioned this pull request Dec 12, 2017
Merged
@addaleax addaleax removed the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Dec 13, 2017
@BridgeAR BridgeAR mentioned this pull request Dec 16, 2017
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@gibfahn
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gibfahn commented Dec 20, 2017

Should this be backported to v6.x-staging? If yes please follow the guide and raise a backport PR, if no let me know or add the dont-land-on label.

gibfahn pushed a commit that referenced this pull request Dec 20, 2017
@devsnek @gibfahn
util: fix negative 0 check in inspect
b718e45 
PR-URL: #17507
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@gibfahn gibfahn mentioned this pull request Dec 20, 2017
Closed
gibfahn pushed a commit that referenced this pull request Dec 20, 2017
@devsnek @gibfahn
util: fix negative 0 check in inspect
3236944 
PR-URL: #17507
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@gibfahn gibfahn mentioned this pull request Dec 20, 2017
Merged
@devsnek devsnek mentioned this pull request Dec 29, 2018
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@apapirovski apapirovski apapirovski approved these changes

@refack refack refack approved these changes

@bnoordhuis bnoordhuis bnoordhuis approved these changes

@addaleax addaleax addaleax approved these changes

@lpinca lpinca lpinca approved these changes

@cjihrig cjihrig cjihrig approved these changes

@XadillaX XadillaX XadillaX approved these changes

@BridgeAR BridgeAR BridgeAR approved these changes

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Successfully merging this pull request may close these issues.

Incorrect result when logging subnormal floating-point number to console.