[all-commits] [llvm/llvm-project] b3be14: [RISCV] Use LiveIntervals::extendToIndices to exte...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b3be14896770b31c18f4ec32b05b334dc811f356
      https://github.com/llvm/llvm-project/commit/b3be14896770b31c18f4ec32b05b334dc811f356
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-07-03 (Wed, 03 Jul 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp
    M llvm/test/CodeGen/RISCV/rvv/vsetvli-insert-crossbb.ll

  Log Message:
  -----------
  [RISCV] Use LiveIntervals::extendToIndices to extend AVL in insertVSETVLI (#97512)

In #96200 we handled extending AVL LiveIntervals across basic blocks,
which fixed a crash in a test case in
133ab9a8c82a31549f060da33fd7e14f1d7f39fd.

This was done by manually adding a single segment to the LiveInterval to
extend it from AVL def -> inserted vsetvli, but in hindsight this was
too simple and fails to handle cases where the vsetlvi is located before
the AVL def.

This patch fixes this by using LiveIntervals::extendToIndices instead
which can handle these cases.

(The crash that this fixes is separate from the crash in #97264)



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