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148 lines
5.7 KiB
148 lines
5.7 KiB
4 months ago
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# RUN: llc -start-after=machine-scheduler %s -o - | FileCheck %s
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# C source:
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# void escape(int *);
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# extern int global;
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# void f(int x) {
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# escape(&x);
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# x = 1;
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# global = x;
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# x = 2;
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# escape(&x);
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# }
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# CHECK-LABEL: f: # @f
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# CHECK: movl %ecx, [[OFF_X:[0-9]+]](%rsp)
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# CHECK: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0]
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# CHECK: leaq [[OFF_X]](%rsp), %rsi
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# CHECK: callq escape
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# CHECK: #DEBUG_VALUE: f:x <- 1
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# CHECK: movl $1, global(%rip)
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# CHECK: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0]
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# CHECK: movl $2, [[OFF_X]](%rsp)
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# CHECK: callq escape
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# CHECK: retq
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--- |
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; ModuleID = '<stdin>'
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source_filename = "dse.c"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.0.24215"
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@global = external global i32, align 4
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #0
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declare void @escape(i32*)
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; Function Attrs: nounwind uwtable
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define void @f(i32 %x) #1 !dbg !8 {
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !14
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call void @escape(i32* %x.addr), !dbg !15
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call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !16
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store i32 1, i32* @global, align 4, !dbg !17
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !18
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store i32 2, i32* %x.addr, align 4, !dbg !18
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call void @escape(i32* %x.addr), !dbg !19
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ret void, !dbg !20
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}
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**) #2
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attributes #0 = { nounwind readnone speculatable }
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attributes #1 = { nounwind uwtable }
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attributes #2 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "dse.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 6.0.0 "}
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!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)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !{!13}
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!13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11)
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!14 = !DILocation(line: 3, column: 12, scope: !8)
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!15 = !DILocation(line: 4, column: 3, scope: !8)
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!16 = !DILocation(line: 5, column: 5, scope: !8)
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!17 = !DILocation(line: 6, column: 10, scope: !8)
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!18 = !DILocation(line: 7, column: 5, scope: !8)
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!19 = !DILocation(line: 8, column: 3, scope: !8)
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!20 = !DILocation(line: 9, column: 1, scope: !8)
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...
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---
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name: f
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gr32, preferred-register: '' }
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- { id: 1, class: gr64, preferred-register: '' }
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liveins:
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- { reg: '$ecx', virtual-reg: '%0' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 8
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adjustsStack: false
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hasCalls: true
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stackProtector: ''
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maxCallFrameSize: 4294967295
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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savePoint: ''
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restorePoint: ''
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fixedStack:
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stack:
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- { id: 0, name: x.addr, type: default, offset: 0, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '', debug-info-variable: '',
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debug-info-expression: '', debug-info-location: '' }
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constants:
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body: |
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bb.0.entry:
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liveins: $ecx
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%0 = COPY $ecx
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MOV32mr %stack.0.x.addr, 1, _, 0, _, %0 :: (store 4 into %ir.x.addr)
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DBG_VALUE %stack.0.x.addr, 0, !13, !DIExpression(), debug-location !14
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ADJCALLSTACKDOWN64 32, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15
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%1 = LEA64r %stack.0.x.addr, 1, _, 0, _
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$rcx = COPY %1, debug-location !15
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CALL64pcrel32 @escape, csr_win64, implicit $rsp, implicit $ssp, implicit $rcx, implicit-def $rsp, implicit-def $ssp, debug-location !15
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ADJCALLSTACKUP64 32, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15
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DBG_VALUE 1, _, !13, !DIExpression(), debug-location !16
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MOV32mi $rip, 1, _, @global, _, 1, debug-location !17 :: (store 4 into @global)
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DBG_VALUE %stack.0.x.addr, 0, !13, !DIExpression(), debug-location !18
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MOV32mi %stack.0.x.addr, 1, _, 0, _, 2, debug-location !18 :: (store 4 into %ir.x.addr)
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ADJCALLSTACKDOWN64 32, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !19
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$rcx = COPY %1, debug-location !19
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CALL64pcrel32 @escape, csr_win64, implicit $rsp, implicit $ssp, implicit $rcx, implicit-def $rsp, implicit-def $ssp, debug-location !19
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ADJCALLSTACKUP64 32, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !19
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RET 0, debug-location !20
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...
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