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Gabriel Wang f2dba2626e SVE2: Improves SVE2 8888 swizzling performance and important fixes (#15662)
* SVE2 was actually disabled in fdfbbce, this issue is fixed
  - The macro __ARM_FEATURE_SVE  is only defined when the compilation target is set as -march=armv8-m+sve2
* Improves 8888 alpha-blending performance
  - Now, in In-Order AArch64 processors, e.g. A520, SVE2 is better than NEON with the 128bit vector width
  - For Out-of-order processors, NEON is still better than SVE2 (We could improve this in the future), the performance is improved from 3.0 to 3.6.
* The 8888 -> RGB565 performance is also improved (from 7.4 to 9.3)
2026-05-26 07:57:44 -07:00
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