| # RUN: llc -start-after=machine-scheduler %s -o - | FileCheck %s |
| |
| # C source: |
| # void escape(int *); |
| # extern int global; |
| # void f(int x) { |
| # escape(&x); |
| # x = 1; |
| # global = x; |
| # x = 2; |
| # escape(&x); |
| # } |
| |
| # CHECK-LABEL: f: # @f |
| # CHECK: movl %ecx, [[OFF_X:[0-9]+]](%rsp) |
| # CHECK: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0] |
| # CHECK: leaq [[OFF_X]](%rsp), %rsi |
| # CHECK: callq escape |
| # CHECK: #DEBUG_VALUE: f:x <- 1 |
| # CHECK: movl $1, global(%rip) |
| # CHECK: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0] |
| # CHECK: movl $2, [[OFF_X]](%rsp) |
| # CHECK: callq escape |
| # CHECK: retq |
| |
| |
| --- | |
| ; ModuleID = '<stdin>' |
| source_filename = "dse.c" |
| target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-pc-windows-msvc19.0.24215" |
| |
| @global = external global i32, align 4 |
| |
| ; Function Attrs: nounwind readnone speculatable |
| declare void @llvm.dbg.value(metadata, metadata, metadata) #0 |
| |
| declare void @escape(i32*) |
| |
| ; Function Attrs: nounwind uwtable |
| define void @f(i32 %x) #1 !dbg !8 { |
| entry: |
| %x.addr = alloca i32, align 4 |
| store i32 %x, i32* %x.addr, align 4 |
| call void @llvm.dbg.value(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !14 |
| call void @escape(i32* %x.addr), !dbg !15 |
| call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !16 |
| store i32 1, i32* @global, align 4, !dbg !17 |
| call void @llvm.dbg.value(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !18 |
| store i32 2, i32* %x.addr, align 4, !dbg !18 |
| call void @escape(i32* %x.addr), !dbg !19 |
| ret void, !dbg !20 |
| } |
| |
| ; Function Attrs: nounwind |
| declare void @llvm.stackprotector(i8*, i8**) #2 |
| |
| attributes #0 = { nounwind readnone speculatable } |
| attributes #1 = { nounwind uwtable } |
| attributes #2 = { nounwind } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3, !4, !5, !6} |
| !llvm.ident = !{!7} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) |
| !1 = !DIFile(filename: "dse.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild") |
| !2 = !{} |
| !3 = !{i32 2, !"Dwarf Version", i32 4} |
| !4 = !{i32 2, !"Debug Info Version", i32 3} |
| !5 = !{i32 1, !"wchar_size", i32 2} |
| !6 = !{i32 7, !"PIC Level", i32 2} |
| !7 = !{!"clang version 6.0.0 "} |
| !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) |
| !9 = !DISubroutineType(types: !10) |
| !10 = !{null, !11} |
| !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !12 = !{!13} |
| !13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11) |
| !14 = !DILocation(line: 3, column: 12, scope: !8) |
| !15 = !DILocation(line: 4, column: 3, scope: !8) |
| !16 = !DILocation(line: 5, column: 5, scope: !8) |
| !17 = !DILocation(line: 6, column: 10, scope: !8) |
| !18 = !DILocation(line: 7, column: 5, scope: !8) |
| !19 = !DILocation(line: 8, column: 3, scope: !8) |
| !20 = !DILocation(line: 9, column: 1, scope: !8) |
| |
| ... |
| --- |
| name: f |
| alignment: 16 |
| exposesReturnsTwice: false |
| legalized: false |
| regBankSelected: false |
| selected: false |
| tracksRegLiveness: true |
| registers: |
| - { id: 0, class: gr32, preferred-register: '' } |
| - { id: 1, class: gr64, preferred-register: '' } |
| liveins: |
| - { reg: '$ecx', virtual-reg: '%0' } |
| frameInfo: |
| isFrameAddressTaken: false |
| isReturnAddressTaken: false |
| hasStackMap: false |
| hasPatchPoint: false |
| stackSize: 0 |
| offsetAdjustment: 0 |
| maxAlignment: 8 |
| adjustsStack: false |
| hasCalls: true |
| stackProtector: '' |
| maxCallFrameSize: 4294967295 |
| hasOpaqueSPAdjustment: false |
| hasVAStart: false |
| hasMustTailInVarArgFunc: false |
| savePoint: '' |
| restorePoint: '' |
| fixedStack: |
| stack: |
| - { id: 0, name: x.addr, type: default, offset: 0, size: 4, alignment: 4, |
| stack-id: default, callee-saved-register: '', debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| constants: |
| body: | |
| bb.0.entry: |
| liveins: $ecx |
| |
| %0 = COPY $ecx |
| MOV32mr %stack.0.x.addr, 1, _, 0, _, %0 :: (store (s32) into %ir.x.addr) |
| DBG_VALUE %stack.0.x.addr, 0, !13, !DIExpression(), debug-location !14 |
| ADJCALLSTACKDOWN64 32, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15 |
| %1 = LEA64r %stack.0.x.addr, 1, _, 0, _ |
| $rcx = COPY %1, debug-location !15 |
| CALL64pcrel32 @escape, csr_win64, implicit $rsp, implicit $ssp, implicit $rcx, implicit-def $rsp, implicit-def $ssp, debug-location !15 |
| ADJCALLSTACKUP64 32, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15 |
| DBG_VALUE 1, _, !13, !DIExpression(), debug-location !16 |
| MOV32mi $rip, 1, _, @global, _, 1, debug-location !17 :: (store (s32) into @global) |
| DBG_VALUE %stack.0.x.addr, 0, !13, !DIExpression(), debug-location !18 |
| MOV32mi %stack.0.x.addr, 1, _, 0, _, 2, debug-location !18 :: (store (s32) into %ir.x.addr) |
| ADJCALLSTACKDOWN64 32, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !19 |
| $rcx = COPY %1, debug-location !19 |
| CALL64pcrel32 @escape, csr_win64, implicit $rsp, implicit $ssp, implicit $rcx, implicit-def $rsp, implicit-def $ssp, debug-location !19 |
| ADJCALLSTACKUP64 32, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !19 |
| RET 0, debug-location !20 |
| |
| ... |