1 # RUN: llc -start-after=machine-scheduler %s -o - | FileCheck %s 2 3 # C source: 4 # void escape(int *); 5 # extern int global; 6 # void f(int x) { 7 # escape(&x); 8 # x = 1; 9 # global = x; 10 # x = 2; 11 # escape(&x); 12 # } 13 14 # CHECK-LABEL: f: # @f 15 # CHECK: movl %ecx, [[OFF_X:[0-9]+]](%rsp) 16 # CHECK: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0] 17 # CHECK: leaq [[OFF_X]](%rsp), %rsi 18 # CHECK: callq escape 19 # CHECK: #DEBUG_VALUE: f:x <- 1 20 # CHECK: movl $1, global(%rip) 21 # CHECK: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0] 22 # CHECK: movl $2, [[OFF_X]](%rsp) 23 # CHECK: callq escape 24 # CHECK: retq 25 26 27 --- | 28 ; ModuleID = '<stdin>' 29 source_filename = "dse.c" 30 target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" 31 target triple = "x86_64-pc-windows-msvc19.0.24215" 32 33 @global = external global i32, align 4 34 35 ; Function Attrs: nounwind readnone speculatable 36 declare void @llvm.dbg.value(metadata, metadata, metadata) #0 37 38 declare void @escape(i32*) 39 40 ; Function Attrs: nounwind uwtable 41 define void @f(i32 %x) #1 !dbg !8 { 42 entry: 43 %x.addr = alloca i32, align 4 44 store i32 %x, i32* %x.addr, align 4 45 call void @llvm.dbg.value(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !14 46 call void @escape(i32* %x.addr), !dbg !15 47 call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !16 48 store i32 1, i32* @global, align 4, !dbg !17 49 call void @llvm.dbg.value(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !18 50 store i32 2, i32* %x.addr, align 4, !dbg !18 51 call void @escape(i32* %x.addr), !dbg !19 52 ret void, !dbg !20 53 } 54 55 ; Function Attrs: nounwind 56 declare void @llvm.stackprotector(i8*, i8**) #2 57 58 attributes #0 = { nounwind readnone speculatable } 59 attributes #1 = { nounwind uwtable } 60 attributes #2 = { nounwind } 61 62 !llvm.dbg.cu = !{!0} 63 !llvm.module.flags = !{!3, !4, !5, !6} 64 !llvm.ident = !{!7} 65 66 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 67 !1 = !DIFile(filename: "dse.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild") 68 !2 = !{} 69 !3 = !{i32 2, !"Dwarf Version", i32 4} 70 !4 = !{i32 2, !"Debug Info Version", i32 3} 71 !5 = !{i32 1, !"wchar_size", i32 2} 72 !6 = !{i32 7, !"PIC Level", i32 2} 73 !7 = !{!"clang version 6.0.0 "} 74 !8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12) 75 !9 = !DISubroutineType(types: !10) 76 !10 = !{null, !11} 77 !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 78 !12 = !{!13} 79 !13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11) 80 !14 = !DILocation(line: 3, column: 12, scope: !8) 81 !15 = !DILocation(line: 4, column: 3, scope: !8) 82 !16 = !DILocation(line: 5, column: 5, scope: !8) 83 !17 = !DILocation(line: 6, column: 10, scope: !8) 84 !18 = !DILocation(line: 7, column: 5, scope: !8) 85 !19 = !DILocation(line: 8, column: 3, scope: !8) 86 !20 = !DILocation(line: 9, column: 1, scope: !8) 87 88 ... 89 --- 90 name: f 91 alignment: 4 92 exposesReturnsTwice: false 93 legalized: false 94 regBankSelected: false 95 selected: false 96 tracksRegLiveness: true 97 registers: 98 - { id: 0, class: gr32, preferred-register: '' } 99 - { id: 1, class: gr64, preferred-register: '' } 100 liveins: 101 - { reg: '$ecx', virtual-reg: '%0' } 102 frameInfo: 103 isFrameAddressTaken: false 104 isReturnAddressTaken: false 105 hasStackMap: false 106 hasPatchPoint: false 107 stackSize: 0 108 offsetAdjustment: 0 109 maxAlignment: 8 110 adjustsStack: false 111 hasCalls: true 112 stackProtector: '' 113 maxCallFrameSize: 4294967295 114 hasOpaqueSPAdjustment: false 115 hasVAStart: false 116 hasMustTailInVarArgFunc: false 117 savePoint: '' 118 restorePoint: '' 119 fixedStack: 120 stack: 121 - { id: 0, name: x.addr, type: default, offset: 0, size: 4, alignment: 4, 122 stack-id: 0, callee-saved-register: '', debug-info-variable: '', 123 debug-info-expression: '', debug-info-location: '' } 124 constants: 125 body: | 126 bb.0.entry: 127 liveins: $ecx 128 129 %0 = COPY $ecx 130 MOV32mr %stack.0.x.addr, 1, _, 0, _, %0 :: (store 4 into %ir.x.addr) 131 DBG_VALUE %stack.0.x.addr, 0, !13, !DIExpression(), debug-location !14 132 ADJCALLSTACKDOWN64 32, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15 133 %1 = LEA64r %stack.0.x.addr, 1, _, 0, _ 134 $rcx = COPY %1, debug-location !15 135 CALL64pcrel32 @escape, csr_win64, implicit $rsp, implicit $ssp, implicit $rcx, implicit-def $rsp, implicit-def $ssp, debug-location !15 136 ADJCALLSTACKUP64 32, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15 137 DBG_VALUE 1, debug-use _, !13, !DIExpression(), debug-location !16 138 MOV32mi $rip, 1, _, @global, _, 1, debug-location !17 :: (store 4 into @global) 139 DBG_VALUE %stack.0.x.addr, 0, !13, !DIExpression(), debug-location !18 140 MOV32mi %stack.0.x.addr, 1, _, 0, _, 2, debug-location !18 :: (store 4 into %ir.x.addr) 141 ADJCALLSTACKDOWN64 32, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !19 142 $rcx = COPY %1, debug-location !19 143 CALL64pcrel32 @escape, csr_win64, implicit $rsp, implicit $ssp, implicit $rcx, implicit-def $rsp, implicit-def $ssp, debug-location !19 144 ADJCALLSTACKUP64 32, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !19 145 RET 0, debug-location !20 146 147 ... 148
