[all-commits] [llvm/llvm-project] b60e62: [RISCV][CostModel] Remove cost of icmp inst in icm...

[Elvis Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b60e62896e2665e1a0ac51fc9942c1c4d31c0f53
      https://github.com/llvm/llvm-project/commit/b60e62896e2665e1a0ac51fc9942c1c4d31c0f53
  Author: Elvis Wang <110374989+ElvisWang123 at users.noreply.github.com>
  Date:   2024-05-20 (Mon, 20 May 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    A llvm/test/Analysis/CostModel/RISCV/cmp-select.ll

  Log Message:
  -----------
  [RISCV][CostModel] Remove cost of icmp inst in icmp+select with SFB. (#91158)

With ShortFowrardBranchOpt(SFB) or ConditionalMoveFusion, scalar
ICmp and scalar Select instructions will lower to SELECT_CC
and lower to PseudoCCMOVGPR which will generate a conditional
branch instruction and a move instruction.
The cost of scalar (ICmp + Select) = (0 + Select instruction cost)



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