src/llvm-project/llvm/test/CodeGen/AArch64/coalescer-drop-subreg-to-reg-imm-ops.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
# RUN: llc -mtriple=arm64-apple-macosx -mcpu=apple-m1 -verify-coalescing -run-pass=register-coalescer -o - %s | FileCheck %s

# Hits assert "Trying to add an operand to a machine instr that is
# already done!" when rematerializing during greedy. This was because
# an IMPLICIT_DEF ended up with some immediate operands during
# coalescing. A SUBREG_TO_REG was not dropping the immediate operands
# when mutating to IMPLICIT_DEF, and would later fail the assert when
# creating a new IMPLICIT_DEF copy during rematerialization.

--- |
  define void @_ZN38SanitizerCommonInterceptors_Scanf_Test8TestBodyEv() {
    ret void
  }

  declare void @_ZL9testScanfPKcjz(ptr, i32, ...)

...
---
name:            _ZN38SanitizerCommonInterceptors_Scanf_Test8TestBodyEv
alignment:       4
tracksRegLiveness: true
frameInfo:
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  maxCallFrameSize: 24
body:             |
  bb.0:
    liveins: $x0, $x1, $x2, $x3, $x4, $x5, $x6

    ; CHECK-LABEL: name: _ZN38SanitizerCommonInterceptors_Scanf_Test8TestBodyEv
    ; CHECK: liveins: $x0, $x1, $x2, $x3, $x4, $x5, $x6
    ; CHECK-NEXT: {{  $}}
    ; CHECK-NEXT: [[DEF:%[0-9]+]]:gpr64sp = IMPLICIT_DEF
    ; CHECK-NEXT: dead [[DEF1:%[0-9]+]]:gpr32 = IMPLICIT_DEF
    ; CHECK-NEXT: [[DEF2:%[0-9]+]]:gpr64common = IMPLICIT_DEF
    ; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr64 = COPY $x5
    ; CHECK-NEXT: [[COPY1:%[0-9]+]]:gpr64 = COPY $x4
    ; CHECK-NEXT: [[COPY2:%[0-9]+]]:gpr64 = COPY $x3
    ; CHECK-NEXT: [[COPY3:%[0-9]+]]:gpr64 = COPY $x2
    ; CHECK-NEXT: [[COPY4:%[0-9]+]]:gpr64 = COPY $x1
    ; CHECK-NEXT: [[COPY5:%[0-9]+]]:gpr64 = COPY $x0
    ; CHECK-NEXT: [[DEF3:%[0-9]+]]:gpr64 = IMPLICIT_DEF
    ; CHECK-NEXT: [[DEF4:%[0-9]+]]:gpr64 = IMPLICIT_DEF
    ; CHECK-NEXT: [[DEF5:%[0-9]+]]:gpr64 = IMPLICIT_DEF
    ; CHECK-NEXT: ADJCALLSTACKDOWN 16, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: BL @_ZL9testScanfPKcjz, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
    ; CHECK-NEXT: ADJCALLSTACKUP 16, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: STRXui [[DEF3]], [[DEF]], 0 :: (store (s64) into stack)
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: STRWui undef [[DEF1]], [[DEF2]], 0 :: (store (s32))
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: STRXui [[DEF4]], undef [[DEF]], 0 :: (store (s64) into stack)
    ; CHECK-NEXT: $x0 = COPY [[COPY5]]
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: $x0 = COPY [[COPY4]]
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: $x0 = COPY [[COPY3]]
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: $x0 = COPY [[COPY2]]
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: $x0 = COPY [[COPY1]]
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: $x0 = COPY [[COPY]]
    ; CHECK-NEXT: ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: ADJCALLSTACKDOWN 24, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: STRXui [[DEF5]], undef [[DEF]], 1 :: (store (s64) into stack + 8)
    ; CHECK-NEXT: ADJCALLSTACKUP 24, 0, implicit-def dead $sp, implicit $sp
    ; CHECK-NEXT: RET_ReallyLR
    %0:gpr64sp = IMPLICIT_DEF
    %1:gpr32 = IMPLICIT_DEF
    %2:gpr64common = IMPLICIT_DEF
    %3:gpr64 = COPY killed $x5
    %4:gpr64 = COPY killed $x4
    %5:gpr64 = COPY killed $x3
    %6:gpr64 = COPY killed $x2
    %7:gpr64 = COPY killed $x1
    %8:gpr64 = COPY killed $x0
    %9:gpr64 = IMPLICIT_DEF
    %10:gpr64 = IMPLICIT_DEF
    %11:gpr64 = SUBREG_TO_REG 0, killed undef %1, %subreg.sub_32
    ADJCALLSTACKDOWN 16, 0, implicit-def dead $sp, implicit $sp
    BL @_ZL9testScanfPKcjz, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
    ADJCALLSTACKUP 16, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    STRXui %9, killed %0, 0 :: (store (s64) into stack)
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    STRWui undef %1, killed %2, 0 :: (store (s32))
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    STRXui killed %10, killed undef %0, 0 :: (store (s64) into stack)
    $x0 = COPY killed %8
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    $x0 = COPY killed %7
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    $x0 = COPY killed %6
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    $x0 = COPY killed %5
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    $x0 = COPY killed %4
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 8, 0, implicit-def dead $sp, implicit $sp
    $x0 = COPY killed %3
    ADJCALLSTACKUP 8, 0, implicit-def dead $sp, implicit $sp
    ADJCALLSTACKDOWN 24, 0, implicit-def dead $sp, implicit $sp
    STRXui killed %11, undef %0, 1 :: (store (s64) into stack + 8)
    ADJCALLSTACKUP 24, 0, implicit-def dead $sp, implicit $sp
    RET_ReallyLR

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