[all-commits] [llvm/llvm-project] 1ff313: [SCEV] Always constant fold mul expression operands

[Nikita Popov via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ff313f0989009f8a080418e93fe510ec66e8999
      https://github.com/llvm/llvm-project/commit/1ff313f0989009f8a080418e93fe510ec66e8999
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2020-10-25 (Sun, 25 Oct 2020)

  Changed paths:
    M llvm/lib/Analysis/ScalarEvolution.cpp
    M llvm/test/Analysis/ScalarEvolution/limit-depth.ll

  Log Message:
  -----------
  [SCEV] Always constant fold mul expression operands

Establish parity with the handling of add expressions, by always
constant folding mul expression operands before checking the depth
limit (this is a non-recursive simplification). The code was already
unconditionally constant folding the case where all operands were
constants, but was not folding multiple constant operands together
if there were also non-constant operands.

This requires picking out a different demonstration for depth-based
folding differences in the limit-depth.ll test.