fix: detect Arm NEON with alternative predefined macro #84
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Currently Arm NEON availability is detected using only the __ARM_NEON__ predefined macro. However this is not used by all modern compilers, it seems it was superseded by __ARM_NEON. The "Arm C Language Extensions" guide[1] refers to __ARM_NEON macro aswell. To be able to detect NEON availability more reliably, check for both macro names. [1]: https://developer.arm.com/documentation/ihi0053/d/ - pdf, section 6.9 Signed-off-by: Gyorgy Sarvari <[email protected]>
kraj
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Feb 13, 2026
The llhttp vendored dependency of nodejs takes advantage of Arm NEON instructions when they are available, however they are detected by checking for an outdated CPU feature macro: it checks for __ARM_NEON__, however it is not defined by new compilers for aarch64, rather they set __ARM_NEON. The Arm C extension guide[1] refers to __ARM_NEON macro aswell. This patch changes the detection to check for both macros when detecting the availability of NEON instructions. The code this patch modifies is generated, so the patch itself isn't suitable for upstream submission, as the root cause of the error is in the generator itself. A PR has been submitted[2] to the generator project to rectify this issue. [1]: https://developer.arm.com/documentation/ihi0053/d/ - pdf, section 6.9 [2]: nodejs/llparse#84 Signed-off-by: Gyorgy Sarvari <[email protected]> Signed-off-by: Khem Raj <[email protected]>
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Currently Arm NEON availability is detected using only the ARM_NEON predefined macro. However this is not defined by all modern compilers, it seems it was superseded by __ARM_NEON. The "Arm C Language Extensions" guide[1] refers to __ARM_NEON macro aswell.
To be able to detect NEON availability more reliably, check for both macro names.
[1]: https://developer.arm.com/documentation/ihi0053/d/ - pdf, section 6.9