[all-commits] [llvm/llvm-project] a10789: [ARM] Recognize SSAT and USAT from SMIN/SMAX

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a10789d6cda71cd2ea13309fd6daf854d44e0906
      https://github.com/llvm/llvm-project/commit/a10789d6cda71cd2ea13309fd6daf854d44e0906
  Author: David Green <david.green at arm.com>
  Date:   2022-02-23 (Wed, 23 Feb 2022)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/test/CodeGen/ARM/fpclamptosat.ll
    M llvm/test/CodeGen/ARM/sadd_sat.ll
    M llvm/test/CodeGen/ARM/sadd_sat_plus.ll
    M llvm/test/CodeGen/ARM/ssat-unroll-loops.ll
    M llvm/test/CodeGen/ARM/ssat.ll
    M llvm/test/CodeGen/ARM/ssub_sat.ll
    M llvm/test/CodeGen/ARM/ssub_sat_plus.ll
    M llvm/test/CodeGen/ARM/usat.ll

  Log Message:
  -----------
  [ARM] Recognize SSAT and USAT from SMIN/SMAX

We have some recognition of SSAT and USAT from SELECT_CC at the moment.
This extends the matching to SMIN/SMAX which can help catch more cases,
either from min/max being the canonical form in instcombine or from some
expanded nodes like fp_to_si_sat.

Differential Revision: https://reviews.llvm.org/D119819