xiaoxiang781216 commented on a change in pull request #5662:
URL: https://github.com/apache/incubator-nuttx/pull/5662#discussion_r818262375
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File path: arch/arm/Kconfig
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@@ -908,6 +908,11 @@ config ARM_FP_ABI_SOFT
---help---
Pass float value via integer register (-mfloat-abi=softfp)
+config ARM_FP_NEON
Review comment:
This config can't work, FPU and NEON share the same register set. OS
save and restore this register set only when FPU is enabled. If you enable NEON
but disable FPU, thread context will corrupt randomly.
ARM also require that FP hardware must exist before silicon vender can
enable NEON when they design SoC, so I don't believe there is any benefit to
enable NEON but not FPU.
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