llvm/test/CodeGen/RISCV/machine-copyprop-noop-removal.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc -o - %s -mtriple=riscv64 -run-pass=machine-cp -mcp-use-is-copy-instr | FileCheck %s

## This test was added to capture a case where MachineCopyPropagation risks
## leaving a no-op register move (add, x0, reg).

---
name: ham
body: |
  ; CHECK-LABEL: name: ham
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x40000000), %bb.3(0x40000000)
  ; CHECK-NEXT:   liveins: $x10
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   renamable $x11 = ANDI killed renamable $x10, 1
  ; CHECK-NEXT:   renamable $x10 = ADDI $x0, 1
  ; CHECK-NEXT:   BEQ killed renamable $x11, $x0, %bb.3
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.4(0x40000000), %bb.2(0x40000000)
  ; CHECK-NEXT:   liveins: $x10
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x11 = ADDI $x0, 0
  ; CHECK-NEXT:   BEQ renamable $x10, $x0, %bb.4
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   $x10 = ADDI $x0, 0
  ; CHECK-NEXT:   PseudoRET implicit $x10
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.3:
  ; CHECK-NEXT:   successors: %bb.4(0x40000000), %bb.2(0x40000000)
  ; CHECK-NEXT:   liveins: $x10
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   renamable $x11 = ADDI $x0, 1
  ; CHECK-NEXT:   renamable $x10 = ADD killed renamable $x11, killed renamable $x10
  ; CHECK-NEXT:   BNE renamable $x10, $x0, %bb.2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.4:
  ; CHECK-NEXT:   liveins: $x10
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   PseudoRET implicit $x10
  bb.0:
    successors: %bb.1(0x40000000), %bb.2(0x40000000)
    liveins: $x10

    renamable $x11 = ANDI killed renamable $x10, 1
    renamable $x10 = ADDI $x0, 1
    BEQ killed renamable $x11, $x0, %bb.2

  bb.1:
    successors: %bb.4(0x40000000), %bb.5(0x40000000)
    liveins: $x10

    $x11 = ADDI $x0, 0
    renamable $x10 = ADD killed renamable $x11, killed renamable $x10
    BEQ renamable $x10, $x0, %bb.4

  bb.5:
    $x10 = ADDI $x0, 0
    PseudoRET implicit $x10

  bb.2:
    successors: %bb.4(0x40000000), %bb.5(0x40000000)
    liveins: $x10

    renamable $x11 = ADDI $x0, 1
    renamable $x10 = ADD killed renamable $x11, killed renamable $x10
    BNE renamable $x10, $x0, %bb.5

  bb.4:
    liveins: $x10

    PseudoRET implicit $x10
...