Add document for -mstrict-align and -mno-strict-align #49
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
|
Ref: |
|
CC @preames |
topperc
reviewed
Jun 6, 2024
nick-knight
approved these changes
Jun 6, 2024
cmuellner
approved these changes
Jun 6, 2024
topperc
added a commit
to topperc/llvm-project
that referenced
this pull request
Jun 10, 2024
…. Alias -m[no-]strict-align to scalar. __riscv_misaligned_fast will be set based on -mno-scalar-strict-align or -mno-strict-align. This matches the direction gcc is proposing. See riscv-non-isa/riscv-c-api-doc#73 riscv-non-isa/riscv-toolchain-conventions#49 riscv-non-isa/riscv-toolchain-conventions#50 riscv-non-isa/riscv-c-api-doc#80
kito-cheng
force-pushed
the
kitoc/opt-strict-align
branch
from
18ef056
to
090aedc
Compare
|
Update to reflect the discussion within GCC and LLVM community: keep it control both scalar and vector unaligned access, because LLVM already use that semantic for more than one release, change it is not good idea, also GCC 14 isn't really control vector memory by -mstrict-align...it's always allowed in GCC 14, so we'll gonna "fix" GCC 14 to fix this behavior |
We have those two option for a while, but not document in this repo yet, however we are intend to claify the scope of the option recently, so it's time to document down what we have agree among different community.
kito-cheng
force-pushed
the
kitoc/opt-strict-align
branch
from
090aedc
to
79008be
Compare
|
Update:
|
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Outdated suggestions cannot be applied.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.
We have those two option for a while, but not document in this repo yet, however we are intend to claify the scope of the option recently, so it's time to document down what we have agree among different community.