Wasmtime GitHub notifications bot (Jun 05 2020 at 02:22): Wasmtime GitHub notifications bot (Jun 05 2020 at 02:22):cfallin opened PR #1825 from spidermonkey-fixes to master:
Properly mask constant values down to appropriate width when
generating a constant value directly in aarch64 backend. This was a
miscompilation introduced in the new-isel refactor. In combination
with failure to respect NarrowValueMode, this resulted in a very
subtle bug when ani32constant was used in bit-twiddling logic.Add support for
iadd_ifcoutin aarch64 backend as used in explicit
heap-check mode. With this change, we no longer fail heap-related
tests with the huge-heap-region mode disabled.Remove a panic that was occurring in some tests that are currently
ignored on aarch64, by simply returning empty/default information in
value_labelfunctionality rather than touching unimplemented APIs.
This is not a bugfix per-se, but removes confusing panic messages from
cargo testoutput that might otherwise mislead.<!--
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Wasmtime GitHub notifications bot (Jun 05 2020 at 02:22):cfallin requested bnjbvr for a review on PR #1825.
Wasmtime GitHub notifications bot (Jun 05 2020 at 22:34):cfallin updated PR #1825 from spidermonkey-fixes to master:
Properly mask constant values down to appropriate width when
generating a constant value directly in aarch64 backend. This was a
miscompilation introduced in the new-isel refactor. In combination
with failure to respect NarrowValueMode, this resulted in a very
subtle bug when ani32constant was used in bit-twiddling logic.Add support for
iadd_ifcoutin aarch64 backend as used in explicit
heap-check mode. With this change, we no longer fail heap-related
tests with the huge-heap-region mode disabled.Remove a panic that was occurring in some tests that are currently
ignored on aarch64, by simply returning empty/default information in
value_labelfunctionality rather than touching unimplemented APIs.
This is not a bugfix per-se, but removes confusing panic messages from
cargo testoutput that might otherwise mislead.<!--
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Wasmtime GitHub notifications bot (Jun 05 2020 at 23:12):cfallin updated PR #1825 from spidermonkey-fixes to master:
Properly mask constant values down to appropriate width when
generating a constant value directly in aarch64 backend. This was a
miscompilation introduced in the new-isel refactor. In combination
with failure to respect NarrowValueMode, this resulted in a very
subtle bug when ani32constant was used in bit-twiddling logic.Add support for
iadd_ifcoutin aarch64 backend as used in explicit
heap-check mode. With this change, we no longer fail heap-related
tests with the huge-heap-region mode disabled.Remove a panic that was occurring in some tests that are currently
ignored on aarch64, by simply returning empty/default information in
value_labelfunctionality rather than touching unimplemented APIs.
This is not a bugfix per-se, but removes confusing panic messages from
cargo testoutput that might otherwise mislead.<!--
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Wasmtime GitHub notifications bot (Jun 06 2020 at 00:30):cfallin updated PR #1825 from spidermonkey-fixes to master:
Properly mask constant values down to appropriate width when
generating a constant value directly in aarch64 backend. This was a
miscompilation introduced in the new-isel refactor. In combination
with failure to respect NarrowValueMode, this resulted in a very
subtle bug when ani32constant was used in bit-twiddling logic.Add support for
iadd_ifcoutin aarch64 backend as used in explicit
heap-check mode. With this change, we no longer fail heap-related
tests with the huge-heap-region mode disabled.Remove a panic that was occurring in some tests that are currently
ignored on aarch64, by simply returning empty/default information in
value_labelfunctionality rather than touching unimplemented APIs.
This is not a bugfix per-se, but removes confusing panic messages from
cargo testoutput that might otherwise mislead.<!--
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the PR.
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here.[ ] A short description of what this does, why it is needed; if the
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Wasmtime GitHub notifications bot (Jun 08 2020 at 16:47):bnjbvr submitted PR Review.
Wasmtime GitHub notifications bot (Jun 08 2020 at 16:47):bnjbvr created PR Review Comment:
nit: corresponds
Wasmtime GitHub notifications bot (Jun 08 2020 at 16:47):bnjbvr submitted PR Review.
Wasmtime GitHub notifications bot (Jun 08 2020 at 16:47):bnjbvr created PR Review Comment:
nit: corresponds
Wasmtime GitHub notifications bot (Jun 08 2020 at 16:47):bnjbvr created PR Review Comment:
It was UnsignedLessThan in the old backend's code; was this a preexisting bug, or is this a bad copy-pasto? I'm not sure it's quite easy to test right now, because there's no support for x86-64 in Spidermonkey, and I'm convinced it's testable with Cranelift's old x86 backend in Spidermonkey.
Wasmtime GitHub notifications bot (Jun 08 2020 at 20:02):cfallin updated PR #1825 from spidermonkey-fixes to master:
Properly mask constant values down to appropriate width when
generating a constant value directly in aarch64 backend. This was a
miscompilation introduced in the new-isel refactor. In combination
with failure to respect NarrowValueMode, this resulted in a very
subtle bug when ani32constant was used in bit-twiddling logic.Add support for
iadd_ifcoutin aarch64 backend as used in explicit
heap-check mode. With this change, we no longer fail heap-related
tests with the huge-heap-region mode disabled.Remove a panic that was occurring in some tests that are currently
ignored on aarch64, by simply returning empty/default information in
value_labelfunctionality rather than touching unimplemented APIs.
This is not a bugfix per-se, but removes confusing panic messages from
cargo testoutput that might otherwise mislead.<!--
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the PR.
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here.[ ] A short description of what this does, why it is needed; if the
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first.[ ] This PR contains test cases, if meaningful.
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Wasmtime GitHub notifications bot (Jun 08 2020 at 20:03):cfallin submitted PR Review.
Wasmtime GitHub notifications bot (Jun 08 2020 at 20:03):cfallin created PR Review Comment:
It's unclear to me why it was the way it was; but with the way that things are lowered now, it should be
>=, as far as I can tell. The documentation for the underlying trait method this fulfills (onTargetIsa) says that it is the condition that should be triggered when an add overflows; and that's definitely carry-flag-set on x86 (and aarch64). In any case we will want to carefully check this when we build out the new x86-64 backend.
Wasmtime GitHub notifications bot (Jun 08 2020 at 20:54):cfallin merged PR #1825.
Last updated: Dec 23 2024 at 12:05 UTC