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Posted to github@trafficserver.apache.org by GitBox <gi...@apache.org> on 2022/02/21 11:23:15 UTC

[GitHub] [trafficserver] wangrong1069 opened a new pull request #8688: update FREELIST macros for AArch64

wangrong1069 opened a new pull request #8688:
URL: https://github.com/apache/trafficserver/pull/8688


   1. remove redundant right shift operations when extract pointer
   ```C
   (((intptr_t)(_x).data) & 0x0000FFFFFFFFFFFFLL), get low 48 bits 
   ((~((((intptr_t)(_x).data) >> 63) - 1)) << 48)
       fill 0 at top 16 bits for user space pointer, fill 1 at top 16 bits for kernel space pointer
   0x0000FFFFFFFFFFFF
       (((intptr_t)(_x).data) & 0x0000FFFFFFFFFFFFLL)      => 0x0000FFFFFFFFFFFF
       ((~((((intptr_t)(_x).data) >> 63) - 1)) << 48)    => 0x0000000000000000
           0x0000FFFFFFFFFFFF -> 0 -> 0xFFFFFFFFFFFFFFFF -> 0 -> 0
   0x8000FFFFFFFFFFFF
       (((intptr_t)(_x).data) & 0x0000FFFFFFFFFFFFLL)      => 0x0000FFFFFFFFFFFF
       ((~((((intptr_t)(_x).data) >> 63) - 1)) << 48)    => 0xFFFF000000000000
           0x8000FFFFFFFFFFFF -> 1 -> 0 -> 0xFFFFFFFFFFFFFFFF -> 0xFFFF000000000000
   ```
   
   2. on AArch64, use 52~62 bits to save version info
   https://www.kernel.org/doc/html/latest/arm64/memory.html


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[GitHub] [trafficserver] zwoop commented on pull request #8688: update FREELIST macros for AArch64

Posted by GitBox <gi...@apache.org>.
zwoop commented on pull request #8688:
URL: https://github.com/apache/trafficserver/pull/8688#issuecomment-1063512245


   Cherry-picked to v9.2.x


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[GitHub] [trafficserver] randall merged pull request #8688: update FREELIST macros for AArch64

Posted by GitBox <gi...@apache.org>.
randall merged pull request #8688:
URL: https://github.com/apache/trafficserver/pull/8688


   


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