llvm/test/CodeGen/PowerPC/machinelicm-cse-dead-flag.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -run-pass early-machinelicm -mtriple=powerpc64le-unknown-linux-gnu \
# RUN:   -verify-machineinstrs %s -o - | FileCheck %s
---
name: deadFlagAfterCSE
# This case tests that after the dead %3 is CSE-ed with hoisted %5 in MachineLICM
# pass, the dead flag will be cleared for %3 if %5 has users.
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: deadFlagAfterCSE
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $x3, $x4
  ; CHECK:   [[COPY:%[0-9]+]]:g8rc = COPY $x3
  ; CHECK:   [[COPY1:%[0-9]+]]:g8rc = COPY $x4
  ; CHECK:   [[ADD8_:%[0-9]+]]:g8rc_and_g8rc_nox0 = ADD8 [[COPY]], [[COPY1]]
  ; CHECK:   [[ADDI8_:%[0-9]+]]:g8rc_and_g8rc_nox0 = ADDI8 [[ADD8_]], 100
  ; CHECK:   B %bb.1
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   [[PHI:%[0-9]+]]:g8rc_and_g8rc_nox0 = PHI [[ADD8_]], %bb.0, %5, %bb.1
  ; CHECK:   STDX [[PHI]], [[ADDI8_]], [[ADD8_]]
  ; CHECK:   [[ADDI8_1:%[0-9]+]]:g8rc = nuw ADDI8 [[PHI]], 1
  ; CHECK:   B %bb.1
  ; CHECK: bb.2:
  ; CHECK:   BLR8 implicit $lr8, implicit $rm
  bb.0:
    liveins: $x3, $x4
    %0:g8rc = COPY $x3
    %1:g8rc = COPY $x4
    %2:g8rc_and_g8rc_nox0 = ADD8 %0, %1
    dead %3:g8rc_and_g8rc_nox0 = ADDI8 %2, 100
    B %bb.1

  bb.1:
    %4:g8rc_and_g8rc_nox0 = PHI %2, %bb.0, %6, %bb.1
    %5:g8rc_and_g8rc_nox0 = ADDI8 %2, 100
    STDX %4, %5, %2
    %6:g8rc = nuw ADDI8 %4, 1
    B %bb.1

  bb.2:
    BLR8 implicit $lr8, implicit $rm
...
---
name: deadFlagAfterCSE2
# This case tests that after the dead %3 is CSE-ed with hoisted dead %5 in
# MachineLICM pass, the dead flag will be kept.
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: deadFlagAfterCSE2
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $x3, $x4
  ; CHECK:   [[COPY:%[0-9]+]]:g8rc = COPY $x3
  ; CHECK:   [[COPY1:%[0-9]+]]:g8rc = COPY $x4
  ; CHECK:   [[ADD8_:%[0-9]+]]:g8rc_and_g8rc_nox0 = ADD8 [[COPY]], [[COPY1]]
  ; CHECK:   dead %3:g8rc_and_g8rc_nox0 = ADDI8 [[ADD8_]], 100
  ; CHECK:   B %bb.1
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   [[PHI:%[0-9]+]]:g8rc_and_g8rc_nox0 = PHI [[ADD8_]], %bb.0, %5, %bb.1
  ; CHECK:   [[ADDI8_:%[0-9]+]]:g8rc = nuw ADDI8 [[PHI]], 1
  ; CHECK:   B %bb.1
  ; CHECK: bb.2:
  ; CHECK:   BLR8 implicit $lr8, implicit $rm
  bb.0:
    liveins: $x3, $x4
    %0:g8rc = COPY $x3
    %1:g8rc = COPY $x4
    %2:g8rc_and_g8rc_nox0 = ADD8 %0, %1
    dead %3:g8rc_and_g8rc_nox0 = ADDI8 %2, 100
    B %bb.1

  bb.1:
    %4:g8rc_and_g8rc_nox0 = PHI %2, %bb.0, %6, %bb.1
    dead %5:g8rc_and_g8rc_nox0 = ADDI8 %2, 100
    %6:g8rc = nuw ADDI8 %4, 1
    B %bb.1

  bb.2:
    BLR8 implicit $lr8, implicit $rm
...