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deps: V8: cherry-pick 56f6a76 #25269

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BridgeAR
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@BridgeAR BridgeAR commented Dec 29, 2018 •
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Original commit message:

[turbofan] Fix -0 check for subnormals.

Previously we'd check `x` for -0 by testing `(1.0 / x) == -Infinity`,
but this will yield the wrong results when `x` is a subnormal, i.e.
really close to 0.

In CSA we already perform bit checks to test for -0, so teach TurboFan
to do the same for comparisons to -0 (via `Object.is`). We introduce a
new NumberIsMinusZero simplified operator to handle the case where
SimplifiedLowering already knows that the input is a number.

Bug: chromium:903043, v8:6882
Change-Id: I0cb7c568029b461a92fc183104d5f359b4bfe7f4
Reviewed-on: https://chromium-review.googlesource.com/c/1328802
Commit-Queue: Benedikt Meurer <[email protected]>
Reviewed-by: Sigurd Schneider <[email protected]>
Cr-Commit-Position: refs/heads/master@{#57382}

Refs: v8/v8@56f6a76

Fixes: #25268

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@BridgeAR
deps: V8: cherry-pick 56f6a76
968a707 
Original commit message:

    [turbofan] Fix -0 check for subnormals.

    Previously we'd check `x` for -0 by testing `(1.0 / x) == -Infinity`,
    but this will yield the wrong results when `x` is a subnormal, i.e.
    really close to 0.

    In CSA we already perform bit checks to test for -0, so teach TurboFan
    to do the same for comparisons to -0 (via `Object.is`). We introduce a
    new NumberIsMinusZero simplified operator to handle the case where
    SimplifiedLowering already knows that the input is a number.

    Bug: chromium:903043, v8:6882
    Change-Id: I0cb7c568029b461a92fc183104d5f359b4bfe7f4
    Reviewed-on: https://chromium-review.googlesource.com/c/1328802
    Commit-Queue: Benedikt Meurer <[email protected]>
    Reviewed-by: Sigurd Schneider <[email protected]>
    Cr-Commit-Position: refs/heads/master@{#57382}

Refs: v8/v8@56f6a76
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@BridgeAR build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2102/pipeline

@nodejs-github-bot nodejs-github-bot added build Issues and PRs related to build files or the CI. v8 engine Issues and PRs related to the V8 dependency. labels Dec 29, 2018
TimothyGu
TimothyGu approved these changes Dec 29, 2018
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Rubber-stamp LGTM.

@devsnek
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devsnek commented Dec 29, 2018

just as a funny sidenote, we made the same mistake in node core :p #17507

mhdawson
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Rubber stamp LGTM

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addaleax commented Jan 8, 2019 •
edited by BridgeAR
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CI: https://ci.nodejs.org/job/node-test-pull-request/19998/ ✅ (yellow)
V8 CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/1992/ ✔️

@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jan 9, 2019
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BridgeAR commented Jan 9, 2019

Resumed yellow CI https://ci.nodejs.org/job/node-test-pull-request/20008/

danbev pushed a commit that referenced this pull request Jan 9, 2019
@BridgeAR @danbev
deps: cherry-pick 56f6a76 from upstream V8
ddbb7d7 
Original commit message:

    [turbofan] Fix -0 check for subnormals.

    Previously we'd check `x` for -0 by testing `(1.0 / x) == -Infinity`,
    but this will yield the wrong results when `x` is a subnormal, i.e.
    really close to 0.

    In CSA we already perform bit checks to test for -0, so teach TurboFan
    to do the same for comparisons to -0 (via `Object.is`). We introduce a
    new NumberIsMinusZero simplified operator to handle the case where
    SimplifiedLowering already knows that the input is a number.

    Bug: chromium:903043, v8:6882
    Change-Id: I0cb7c568029b461a92fc183104d5f359b4bfe7f4
    Reviewed-on: https://chromium-review.googlesource.com/c/1328802
    Commit-Queue: Benedikt Meurer <[email protected]>
    Reviewed-by: Sigurd Schneider <[email protected]>
    Cr-Commit-Position: refs/heads/master@{#57382}

PR-URL: #25269
Refs: v8/v8@56f6a76
Fixes: #25268
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Franziska Hinkelmann <[email protected]>
Reviewed-By: Ujjwal Sharma <[email protected]>
Reviewed-By: Gus Caplan <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: James M Snell <[email protected]>
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danbev commented Jan 9, 2019

Landed in ddbb7d7.

I updated the commit summary/subject to be deps: cherry-pick 56f6a76 from upstream V8 to avoid the issue reported by Travis CI, hope that was ok.

@danbev danbev closed this Jan 9, 2019
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addaleax commented Jan 15, 2019 •
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@BridgeAR This would need a manual backport to v11.x-staging (it applies cleanly but does not compile)

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@addaleax I would like to backport this and it lands cleanly on v11.x but it relies on some other code and I do not know the code base well enough to backport this on my own (see also #25270 (comment)).

It would be great if the @nodejs/v8-update could have a look at backporting this.

@targos targos mentioned this pull request Feb 6, 2019
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targos commented Feb 14, 2019

Attempts to backport to v11 and v10:

This was referenced Apr 23, 2019
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@BridgeAR BridgeAR deleted the fix-weird-numbers-master branch January 20, 2020 11:51
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@ryzokuken ryzokuken ryzokuken approved these changes

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@devsnek devsnek devsnek approved these changes

@TimothyGu TimothyGu TimothyGu approved these changes

@jasnell jasnell jasnell approved these changes

@fhinkel fhinkel fhinkel approved these changes

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Object.is(-Number.MIN_VALUE, -0) broken on ≥ v10.0.0