| # Generated with |
| # |
| # clang -g -O1 -S -emit-llvm test.c |
| # llc -stop-before=branch-folder test.ll |
| # |
| # typedef struct bar { |
| # int data; |
| # } bar; |
| # |
| # int foo(int a) |
| # { |
| # return a; |
| # } |
| # |
| # int baz(int *out) |
| # { |
| # int ret; |
| # |
| # if ((ret = foo(*out)) < 0) |
| # return ret; |
| # if (out) |
| # *out = 1; |
| # |
| # return 0; |
| # } |
| # |
| # int test(bar *s) |
| # { |
| # int idx, ret; |
| # |
| # retry: |
| # do { |
| # ret = baz(&idx); |
| # if (ret < 0) |
| # return ret; |
| # } while (idx < 0 || !s->data); |
| # |
| # goto retry; |
| # } |
| # |
| # RUN: llc -o - %s -mtriple=x86_64-- -run-pass=branch-folder | FileCheck %s |
| --- | |
| ; ModuleID = 'test.ll' |
| source_filename = "test.ll" |
| |
| %struct.bar = type { i32 } |
| |
| define i32 @foo(i32 returned %a) local_unnamed_addr { |
| entry: |
| ret i32 %a |
| } |
| |
| define i32 @baz(i32* %out) local_unnamed_addr !dbg !4 { |
| entry: |
| %0 = load i32, i32* %out, align 4 |
| %call = tail call i32 @foo(i32 %0), !dbg !9 |
| %cmp = icmp slt i32 %call, 0 |
| br i1 %cmp, label %cleanup, label %if.then1 |
| |
| if.then1: ; preds = %entry |
| store i32 1, i32* %out, align 4 |
| br label %cleanup |
| |
| cleanup: ; preds = %if.then1, %entry |
| %retval.0 = phi i32 [ %call, %entry ], [ 0, %if.then1 ] |
| ret i32 %retval.0 |
| } |
| |
| define i32 @test(%struct.bar* nocapture readonly %s) local_unnamed_addr !dbg !11 { |
| entry: |
| %idx = alloca i32, align 4 |
| call void @llvm.dbg.label(metadata !20), !dbg !21 |
| %call58 = call i32 @baz(i32* nonnull %idx), !dbg !22 |
| %cmp69 = icmp slt i32 %call58, 0 |
| br i1 %cmp69, label %if.then, label %do.cond.lr.ph.lr.ph |
| |
| do.cond.lr.ph.lr.ph: ; preds = %entry |
| br label %do.cond |
| |
| retry.loopexit: ; preds = %lor.rhs |
| call void @llvm.dbg.label(metadata !20), !dbg !21 |
| %call5 = call i32 @baz(i32* nonnull %idx), !dbg !22 |
| %cmp6 = icmp slt i32 %call5, 0 |
| br i1 %cmp6, label %if.then, label %do.cond |
| |
| if.then: ; preds = %do.body.backedge, %retry.loopexit, %entry |
| %call.lcssa = phi i32 [ %call58, %entry ], [ %call, %do.body.backedge ], [ %call5, %retry.loopexit ] |
| ret i32 %call.lcssa |
| |
| do.cond: ; preds = %retry.loopexit, %do.body.backedge, %do.cond.lr.ph.lr.ph |
| %0 = load i32, i32* %idx, align 4 |
| %cmp1 = icmp slt i32 %0, 0 |
| br i1 %cmp1, label %do.body.backedge, label %lor.rhs |
| |
| lor.rhs: ; preds = %do.cond |
| %1 = bitcast %struct.bar* %s to i32* |
| %2 = load i32, i32* %1, align 4 |
| %tobool = icmp eq i32 %2, 0 |
| br i1 %tobool, label %do.body.backedge, label %retry.loopexit |
| |
| do.body.backedge: ; preds = %lor.rhs, %do.cond |
| %call = call i32 @baz(i32* nonnull %idx), !dbg !22 |
| %cmp = icmp slt i32 %call, 0 |
| br i1 %cmp, label %if.then, label %do.cond |
| } |
| |
| ; Function Attrs: nounwind readnone speculatable |
| declare void @llvm.dbg.label(metadata) #0 |
| |
| ; Function Attrs: nounwind |
| declare void @llvm.stackprotector(i8*, i8**) #1 |
| |
| attributes #0 = { nounwind readnone speculatable } |
| attributes #1 = { nounwind } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: GNU) |
| !1 = !DIFile(filename: "test.c", directory: "/home/users") |
| !2 = !{} |
| !3 = !{i32 2, !"Debug Info Version", i32 3} |
| !4 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 10, type: !5, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2) |
| !5 = !DISubroutineType(types: !6) |
| !6 = !{!7, !8} |
| !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) |
| !9 = !DILocation(line: 14, column: 14, scope: !10) |
| !10 = distinct !DILexicalBlock(scope: !4, file: !1, line: 14, column: 7) |
| !11 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 22, type: !12, isLocal: false, isDefinition: true, scopeLine: 23, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !19) |
| !12 = !DISubroutineType(types: !13) |
| !13 = !{!7, !14} |
| !14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64) |
| !15 = !DIDerivedType(tag: DW_TAG_typedef, name: "bar", file: !1, line: 3, baseType: !16) |
| !16 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "bar", file: !1, line: 1, size: 32, elements: !17) |
| !17 = !{!18} |
| !18 = !DIDerivedType(tag: DW_TAG_member, name: "data", scope: !16, file: !1, line: 2, baseType: !7, size: 32) |
| !19 = !{!20} |
| !20 = !DILabel(scope: !11, name: "retry", file: !1, line: 26) |
| !21 = !DILocation(line: 26, column: 1, scope: !11) |
| !22 = !DILocation(line: 28, column: 11, scope: !23) |
| !23 = distinct !DILexicalBlock(scope: !11, file: !1, line: 27, column: 6) |
| |
| ... |
| --- |
| name: foo |
| alignment: 16 |
| exposesReturnsTwice: false |
| legalized: false |
| regBankSelected: false |
| selected: false |
| failedISel: false |
| tracksRegLiveness: true |
| hasWinCFI: false |
| registers: |
| liveins: |
| - { reg: '$edi', virtual-reg: '' } |
| frameInfo: |
| isFrameAddressTaken: false |
| isReturnAddressTaken: false |
| hasStackMap: false |
| hasPatchPoint: false |
| stackSize: 0 |
| offsetAdjustment: 0 |
| maxAlignment: 0 |
| adjustsStack: false |
| hasCalls: false |
| stackProtector: '' |
| maxCallFrameSize: 0 |
| cvBytesOfCalleeSavedRegisters: 0 |
| hasOpaqueSPAdjustment: false |
| hasVAStart: false |
| hasMustTailInVarArgFunc: false |
| localFrameSize: 0 |
| savePoint: '' |
| restorePoint: '' |
| fixedStack: |
| stack: |
| constants: |
| body: | |
| bb.0.entry: |
| liveins: $edi |
| |
| renamable $eax = COPY $edi |
| RET 0, $eax |
| |
| ... |
| --- |
| name: baz |
| alignment: 16 |
| exposesReturnsTwice: false |
| legalized: false |
| regBankSelected: false |
| selected: false |
| failedISel: false |
| tracksRegLiveness: true |
| hasWinCFI: false |
| registers: |
| liveins: |
| - { reg: '$rdi', virtual-reg: '' } |
| frameInfo: |
| isFrameAddressTaken: false |
| isReturnAddressTaken: false |
| hasStackMap: false |
| hasPatchPoint: false |
| stackSize: 8 |
| offsetAdjustment: 0 |
| maxAlignment: 0 |
| adjustsStack: true |
| hasCalls: true |
| stackProtector: '' |
| maxCallFrameSize: 0 |
| cvBytesOfCalleeSavedRegisters: 8 |
| hasOpaqueSPAdjustment: false |
| hasVAStart: false |
| hasMustTailInVarArgFunc: false |
| localFrameSize: 0 |
| savePoint: '' |
| restorePoint: '' |
| fixedStack: |
| - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default, |
| callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| stack: |
| constants: |
| body: | |
| bb.0.entry: |
| successors: %bb.1(0x30000000), %bb.2(0x50000000) |
| liveins: $rdi, $rbx |
| |
| frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 16 |
| CFI_INSTRUCTION offset $rbx, -16 |
| renamable $rbx = COPY $rdi |
| renamable $edi = MOV32rm $rdi, 1, $noreg, 0, $noreg :: (load (s32) from %ir.out) |
| CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $ssp, implicit $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !9 |
| TEST32rr renamable $eax, renamable $eax, implicit-def $eflags |
| JCC_1 %bb.2, 9, implicit killed $eflags |
| ; CHECK: JCC_1 %bb.2, 8, implicit $eflags |
| |
| bb.1: |
| successors: %bb.3(0x80000000) |
| liveins: $eax |
| |
| JMP_1 %bb.3 |
| |
| bb.2.if.then1: |
| successors: %bb.3(0x80000000) |
| liveins: $rbx |
| |
| MOV32mi killed renamable $rbx, 1, $noreg, 0, $noreg, 1 :: (store (s32) into %ir.out) |
| renamable $eax = MOV32r0 implicit-def dead $eflags |
| |
| bb.3.cleanup: |
| liveins: $eax |
| |
| $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 8 |
| RET 0, $eax |
| |
| ... |
| --- |
| name: test |
| alignment: 16 |
| exposesReturnsTwice: false |
| legalized: false |
| regBankSelected: false |
| selected: false |
| failedISel: false |
| tracksRegLiveness: true |
| hasWinCFI: false |
| registers: |
| liveins: |
| - { reg: '$rdi', virtual-reg: '' } |
| frameInfo: |
| isFrameAddressTaken: false |
| isReturnAddressTaken: false |
| hasStackMap: false |
| hasPatchPoint: false |
| stackSize: 24 |
| offsetAdjustment: 0 |
| maxAlignment: 4 |
| adjustsStack: true |
| hasCalls: true |
| stackProtector: '' |
| maxCallFrameSize: 0 |
| cvBytesOfCalleeSavedRegisters: 16 |
| hasOpaqueSPAdjustment: false |
| hasVAStart: false |
| hasMustTailInVarArgFunc: false |
| localFrameSize: 0 |
| savePoint: '' |
| restorePoint: '' |
| fixedStack: |
| - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default, |
| callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default, |
| callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| stack: |
| - { id: 0, name: idx, type: default, offset: -28, size: 4, alignment: 4, |
| stack-id: default, callee-saved-register: '', callee-saved-restored: true, |
| debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } |
| constants: |
| body: | |
| bb.0.entry: |
| successors: %bb.1(0x30000000), %bb.2(0x50000000) |
| liveins: $rdi, $r14, $rbx |
| |
| frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 16 |
| frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 24 |
| frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 32 |
| CFI_INSTRUCTION offset $rbx, -24 |
| CFI_INSTRUCTION offset $r14, -16 |
| renamable $rbx = COPY $rdi |
| DBG_LABEL !20, debug-location !21 |
| renamable $rdi = LEA64r $rsp, 1, $noreg, 4, $noreg |
| CALL64pcrel32 @baz, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !22 |
| TEST32rr renamable $eax, renamable $eax, implicit-def $eflags |
| JCC_1 %bb.2, 9, implicit killed $eflags |
| ; CHECK: JCC_1 %bb.5, 8, implicit $eflags |
| |
| bb.1: |
| successors: %bb.5(0x80000000) |
| liveins: $eax |
| |
| JMP_1 %bb.5 |
| |
| bb.2: |
| successors: %bb.6(0x80000000) |
| liveins: $rbx |
| |
| renamable $r14 = LEA64r $rsp, 1, $noreg, 4, $noreg |
| JMP_1 %bb.6 |
| |
| bb.3.retry.loopexit: |
| successors: %bb.4(0x04000000), %bb.6(0x7c000000) |
| liveins: $rbx, $r14 |
| |
| DBG_LABEL !20, debug-location !21 |
| $rdi = COPY renamable $r14, debug-location !22 |
| CALL64pcrel32 @baz, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !22 |
| TEST32rr renamable $eax, renamable $eax, implicit-def $eflags |
| JCC_1 %bb.6, 9, implicit killed $eflags |
| |
| bb.4: |
| successors: %bb.5(0x80000000) |
| liveins: $eax |
| |
| |
| bb.5.if.then: |
| liveins: $eax |
| |
| $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags |
| CFI_INSTRUCTION def_cfa_offset 24 |
| $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 16 |
| $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 8 |
| RET 0, $eax |
| |
| bb.6.do.cond: |
| successors: %bb.8(0x30000000), %bb.7(0x50000000) |
| liveins: $rbx, $r14 |
| |
| CMP32mi8 $rsp, 1, $noreg, 4, $noreg, 0, implicit-def $eflags :: (dereferenceable load (s32) from %ir.idx) |
| JCC_1 %bb.8, 8, implicit killed $eflags |
| JMP_1 %bb.7 |
| |
| bb.7.lor.rhs: |
| successors: %bb.8(0x30000000), %bb.3(0x50000000) |
| liveins: $rbx, $r14 |
| |
| CMP32mi8 renamable $rbx, 1, $noreg, 0, $noreg, 0, implicit-def $eflags :: (load (s32) from %ir.1) |
| JCC_1 %bb.3, 5, implicit killed $eflags |
| JMP_1 %bb.8 |
| |
| bb.8.do.body.backedge: |
| successors: %bb.9(0x04000000), %bb.6(0x7c000000) |
| liveins: $rbx, $r14 |
| |
| $rdi = COPY renamable $r14, debug-location !22 |
| CALL64pcrel32 @baz, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !22 |
| TEST32rr renamable $eax, renamable $eax, implicit-def $eflags |
| JCC_1 %bb.6, 9, implicit killed $eflags |
| |
| bb.9: |
| successors: %bb.5(0x80000000) |
| liveins: $eax |
| |
| JMP_1 %bb.5 |
| |
| ... |
