[all-commits] [llvm/llvm-project] 37f9ee: [RISCV] Allow conversion of fp divisions to fp mul...

[Anton Sidorenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 37f9eec14298731b0e2ca724c101478994df4243
      https://github.com/llvm/llvm-project/commit/37f9eec14298731b0e2ca724c101478994df4243
  Author: Anton Sidorenko <anton.sidorenko at syntacore.com>
  Date:   2022-12-15 (Thu, 15 Dec 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.h
    M llvm/test/CodeGen/RISCV/repeated-fp-divisors.ll

  Log Message:
  -----------
  [RISCV] Allow conversion of fp divisions to fp multiplications by the reciprocal

If the divisor is repeated at least twice, we will convert the FDIVs to the
calculation of the reciprocal and FMULs.

We perform the transformation only under fast-math mode. FDIVs must have
'arcp' flag.

Differential Revision: https://reviews.llvm.org/D140024