# RUN: llc -mtriple=x86_64-gnu-linux -run-pass=machine-combiner %s -o - | FileCheck %s

--- |
  define float @reassoc_me(float %f1, float %f2, float %f3, float %f4) !dbg !4 {
    %add = fadd reassoc nsz float %f1, %f2, !dbg !10
    %add1 = fadd reassoc nsz float %add, %f3, !dbg !10
    %add2 = fadd reassoc nsz float %add1, %f4, !dbg !10
    call void @llvm.dbg.value(metadata float %add2, metadata !9, metadata !DIExpression()), !dbg !10
    ret float %add2, !dbg !10
  }

  declare void @llvm.dbg.value(metadata, metadata, metadata)

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!2, !3}

  !0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "hello", isOptimized: true, emissionKind: FullDebug)
  !1 = !DIFile(filename: "reassoc.c", directory: "blah")
  !2 = !{i32 7, !"Dwarf Version", i32 4}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = distinct !DISubprogram(name: "reassoc_me", scope: !1, file: !1, line: 1, type: !5, scopeLine: 1, unit: !0, retainedNodes: !8)
  !5 = !DISubroutineType(types: !6)
  !6 = !{!7, !7, !7, !7, !7}
  !7 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
  !8 = !{!9}
  !9 = !DILocalVariable(name: "temp3", scope: !4, file: !1, line: 4, type: !7)
  !10 = !DILocation(line: 0, scope: !4)

...
---
name:            reassoc_me
alignment:       16
debugInstrRef:   true
body:             |
  bb.0 (%ir-block.0):
    liveins: $xmm0, $xmm1, $xmm2, $xmm3

    %3:fr32 = COPY $xmm3
    %2:fr32 = COPY $xmm2
    %1:fr32 = COPY $xmm1
    %0:fr32 = COPY $xmm0
    %4:fr32 = nsz reassoc nofpexcept ADDSSrr %0, %1, implicit $mxcsr, debug-location !10
    %5:fr32 = nsz reassoc nofpexcept ADDSSrr %4, %2, implicit $mxcsr, debug-location !10
    %6:fr32 = nsz reassoc nofpexcept ADDSSrr %5, %3, implicit $mxcsr, debug-instr-number 1, debug-location !10
    DBG_INSTR_REF !9, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !10
    $xmm0 = COPY %6, debug-location !10
    RET 0, $xmm0, debug-location !10

  ; CHECK: ![[VAR:.*]] = !DILocalVariable(name: "temp3"
  ; CHECK:      %[[arg3:.*]]:fr32 = COPY $xmm3
  ; CHECK-NEXT: %[[arg2:.*]]:fr32 = COPY $xmm2
  ; CHECK-NEXT: %[[arg1:.*]]:fr32 = COPY $xmm1
  ; CHECK-NEXT: %[[arg0:.*]]:fr32 = COPY $xmm0
  ; CHECK-NEXT: %[[add1:.*]]:fr32 = {{.*}} ADDSSrr %[[arg0]], %[[arg1]]
  ; CHECK-NEXT: %[[add2:.*]]:fr32 = {{.*}} ADDSSrr %[[arg2]], %[[arg3]]
  ; CHECK-NEXT:                            ADDSSrr %[[add1]], killed %[[add2]], {{.*}} debug-instr-number 1
  ; CHECK-NEXT: DBG_INSTR_REF ![[VAR]], !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0)
...