[all-commits] [llvm/llvm-project] 20a9be: Revert "[LoongArch] Lowering flog2 to flogb (#1629...

[wanglei via All-commits]

  Branch: refs/heads/release/22.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 20a9be33d173d3f83612b655f522b721ff51ec1a
      https://github.com/llvm/llvm-project/commit/20a9be33d173d3f83612b655f522b721ff51ec1a
  Author: wanglei <wanglei at loongson.cn>
  Date:   2026-01-20 (Tue, 20 Jan 2026)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchFloat32InstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchFloat64InstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
    M llvm/test/CodeGen/LoongArch/ir-instruction/flog2.ll
    M llvm/test/CodeGen/LoongArch/lasx/ir-instruction/flog2.ll
    M llvm/test/CodeGen/LoongArch/lsx/ir-instruction/flog2.ll

  Log Message:
  -----------
  Revert "[LoongArch] Lowering flog2 to flogb (#162978)"

This reverts commit d9e5e725ed33e462477d5559ffece0d08e9c8dad.

The semantics of `flog2(x)` and `logb(x)` are different.

Fixes: https://github.com/llvm/llvm-project/issues/176818

Reviewers: zhaoqi5, SixWeining, ylzsx

Pull Request: https://github.com/llvm/llvm-project/pull/176850

(cherry picked from commit 009e0ccbbcb5d33dcf864efea177a82175962816)



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