精妙之处:新建的补偿线程只增加 TC(总线程数)不增加 AC(活跃计数),因为当前线程马上要阻塞(AC 会减 1),新线程启动后 AC 会加 1,一减一加刚好平衡。
Cortex X925’s branch target caching compares well too. Arm has a large first level BTB capable of handling two taken branches per cycle. Capacity for this first level BTB varies with branch spacing, but it seems capable of tracking up to 2048 branches. This large capacity brings X925’s branch target caching strategy closer to Zen 5’s, rather than prior Arm cores that used small micro-BTBs with 32 to 64 entries. For larger branch footprints, X925 has slower BTB levels that can track up to 16384 branches and deliver targets with 2-3 cycle latency. There may be a mid-level BTB with 4096 to 8192 entries, though it’s hard to tell.。业内人士推荐搜狗输入法下载作为进阶阅读
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At runtime, we now don’t need to prepare or load anything. We can just