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Bit-twiddling optimizations in Zed's Rope

(zed.dev)
120 points misternugget | 1 comments | 18 Nov 24 16:39 UTC | HN request time: 0s | source
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camel-cdr ◴[20 Nov 24 21:29 UTC] No.42198301[source]▶
nth_set_bit_u64: wouldn't that be __builtin_ctzll(_pdep_u64(1<<n, v)) with BMI2?
replies(3): >>42198733 #>>42199867 #>>42200581 #
1. stouset ◴[21 Nov 24 02:46 UTC] No.42200581[source]▶
I believe the equivalent ARM64 instructions are in SVE2 which isn’t yet supported on Apple’s M-series chips as of M4, sadly.