bpf: verifier: stop emitting zext for LDX #5664
Closed
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
![kernel-patches-daemon-bpf[bot]](https://avatars.githubusercontent.com/u/70728002?s=60&v=4){kind=small}
|
Upstream branch: 5bbb9e1 |
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
1fd6cd6
to
96c4b8f
Compare
|
Upstream branch: 5bbb9e1 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/783586=>bpf-next
branch
from
a656a0c
to
c4e19f9
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
96c4b8f
to
e4f30c6
Compare
The JITs should not depend on the verifier for zero extending the upper 32 bits of the destination register when loading a byte, half-word, or word. A following patch will make the verifier stop patching zext instructions after LDX. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
The JITs should not depend on the verifier for zero extending the upper 32 bits of the destination register when loading a byte, half-word, or word. A following patch will make the verifier stop patching zext instructions after LDX. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
The JITs should not depend on the verifier for zero extending the upper 32 bits of the destination register when loading a byte, half-word, or word. A following patch will make the verifier stop patching zext instructions after LDX. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
The JITs should not depend on the verifier for zero extending the upper 32 bits of the destination register when loading a byte, half-word, or word. A following patch will make the verifier stop patching zext instructions after LDX. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
The JITs should not depend on the verifier for zero extending the upper 32 bits of the destination register when loading a byte, half-word, or word. A following patch will make the verifier stop patching zext instructions after LDX. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
All 64-bit JITs utilize a single instruction to load + zero-extend a byte, word, or a half-word. The optimisation of emitting zext for LDX is not useful for most of the JITs. All the JITs that relied on the verifier for zero extension of LDX desitination registers have been modified to always zero extend the destination. Now the verifier can safely mark LDX destination as 64-bit and stop emitting zero-extension instructions for it. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
|
Upstream branch: 5bbb9e1 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/783586=>bpf-next
branch
from
c4e19f9
to
7c30304
Compare
|
At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=783586 expired. Closing PR. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Pull request for series with
subject: bpf: verifier: stop emitting zext for LDX
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=783586