scriptc

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Chris Tate 82f5aa9608 Keep x86-64-v3 code from running slower than the baseline

- Worker programs run strip-mined typed-array loops in blocks of 128
  iterations when the program's code is compiled for x86-64-v3 or above,
  or with --cpu-dispatch. At that level the vectorized loop over bytes
  takes 128 iterations a step, so in blocks of 64 its vector code never
  ran.
- In --cpu-dispatch builds, the LLVM helper gives an x86-64-v3 copy the
  optimized code of its baseline copy when the v3 code has vectors of at
  most 128 bits, none wider, and no rounding or bit-count intrinsic in a
  loop. Its direct calls go to the callees' x86-64-v3 copies. The text
  partitioner places each x86-64-v3 copy with its baseline copy, so the
  two are optimized in one partition.

2026-10-29 20:21:41 -05:00