[all-commits] [llvm/llvm-project] e80637: [LangRef] Update the semantic of `experimental.get...

[Min-Yih Hsu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e8063702cfbbf39f0b92283d0588dee264b5eb2b
      https://github.com/llvm/llvm-project/commit/e8063702cfbbf39f0b92283d0588dee264b5eb2b
  Author: Min-Yih Hsu <min.hsu at sifive.com>
  Date:   2024-08-27 (Tue, 27 Aug 2024)

  Changed paths:
    M llvm/docs/LangRef.rst

  Log Message:
  -----------
  [LangRef] Update the semantic of `experimental.get.vector.length` (#104475)

The previous semantics of `llvm.experimental.get.vector.length` was too
permissive such that it gave optimizers a hard time on anything related
to the number of iterations of VP-vectorized loops.

This patch tries to address this by assigning it a set of stricter
semantics similar to that of RVV's VSETVLI instructions, while being not
too RISC-V specific and leaving room for other (future) targets.

---------

Co-authored-by: Craig Topper <craig.topper at sifive.com>



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