[all-commits] [llvm/llvm-project] 1fafa3: [SCEV] Avoid unnecessary call to getExitingBlock()...

[Enna1 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1fafa32f6ee844f0862954d0b2330dee26b0469f
      https://github.com/llvm/llvm-project/commit/1fafa32f6ee844f0862954d0b2330dee26b0469f
  Author: Enna1 <xumingjie.enna1 at bytedance.com>
  Date:   2024-06-21 (Fri, 21 Jun 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/ScalarEvolution.h
    M llvm/lib/Analysis/ScalarEvolution.cpp

  Log Message:
  -----------
  [SCEV] Avoid unnecessary call to getExitingBlock() in computeExitLimit() (#96188)

In `computeExitLimit()`, we use `getExitingBlock()` to check if loop has
exactly one exiting block.
Since `computeExitLimit()` is only used in
`computeBackedgeTakenCount()`, and `getExitingBlocks()` is called to get
all exiting blocks in `computeBackedgeTakenCount()`, we can simply check
if loop has exactly one exiting block by checking if the number of
exiting blocks equals 1 in `computeBackedgeTakenCount()` and pass it as
an argument to `computeExitLimit()`.

This change helps to improve the compile time for files containing large
loops.



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