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Posted to commits@nuttx.apache.org by "anchao (via GitHub)" <gi...@apache.org> on 2026/10/20 08:34:19 UTC
[PR] armv8-m: reset FPSCR LTPSIZE only for MVE builds [nuttx]
anchao opened a new pull request, #20832:
URL: https://github.com/apache/nuttx/pull/20832
## Summary
Limit the ARMv8-M FPSCR LTPSIZE reset to MVE-enabled builds.
The LTPSIZE field is used by MVE tail predication. The exception paths previously reset FPSCR.LTPSIZE whenever `CONFIG_ARCH_FPU` was enabled, even on FPU-only builds without MVE support.
This change keeps the reset under `CONFIG_ARM_HAVE_MVE`, avoiding unnecessary FPSCR writes on non-MVE FPU configurations while preserving the required MVE tail-predication semantics.
## Impact
- Avoids unnecessary FPSCR writes on FPU-only ARMv8-M builds.
- Keeps MVE exception-path behavior unchanged.
- Preserves the VPR/MVE context model.
## Testing
Built and ostest successfully with:
- `ek-ra8m1:nsh`
- `mps3-an547:nsh`
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Re: [PR] armv8-m: reset FPSCR LTPSIZE only for MVE builds [nuttx]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #20832:
URL: https://github.com/apache/nuttx/pull/20832#issuecomment-6299243573
<!-- membrowse-pr-comment -->
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*No memory changes detected for:*
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- [esp32-devkitc](https://membrowse.com/public/apache/nuttx/target/esp32-devkitc/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [hifive1-revb](https://membrowse.com/public/apache/nuttx/target/hifive1-revb/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [mirtoo](https://membrowse.com/public/apache/nuttx/target/mirtoo/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [qemu-armv8a](https://membrowse.com/public/apache/nuttx/target/qemu-armv8a/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [qemu-intel64](https://membrowse.com/public/apache/nuttx/target/qemu-intel64/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [rx65n-rsk2mb](https://membrowse.com/public/apache/nuttx/target/rx65n-rsk2mb/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [s698pm-dkit](https://membrowse.com/public/apache/nuttx/target/s698pm-dkit/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
- [stm32-nucleo-f103rb](https://membrowse.com/public/apache/nuttx/target/stm32-nucleo-f103rb/compare?head=f610d95b298cd4f0727e32907afbe915dd8614c4&base=f479de022ef3f281e01dbc248b1a199693a907e1)
---
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Re: [PR] armv8-m: reset FPSCR LTPSIZE only for MVE builds [nuttx]
Posted by "Donny9 (via GitHub)" <gi...@apache.org>.
Donny9 merged PR #20832:
URL: https://github.com/apache/nuttx/pull/20832
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