--- /dev/null
+# 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)
+...