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Use the frame index side table for byval and inalloca arguments

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Summary:
For inalloca functions, this is a very common code pattern:

  %argpack = type <{ i32, i32, i32 }>
  define void @f(%argpack* inalloca %args) {
  entry:
    %a = getelementptr inbounds %argpack, %argpack* %args, i32 0, i32 0
    %b = getelementptr inbounds %argpack, %argpack* %args, i32 0, i32 1
    %c = getelementptr inbounds %argpack, %argpack* %args, i32 0, i32 2
    tail call void @llvm.dbg.declare(metadata i32* %a, ... "a")
    tail call void @llvm.dbg.declare(metadata i32* %c, ... "b")
    tail call void @llvm.dbg.declare(metadata i32* %b, ... "c")

Even though these GEPs can be simplified to a constant offset from EBP
or RSP, we don't do that at -O0, and each GEP is computed into a
register. Registers used to compute argument addresses are typically
spilled and clobbered very quickly after the initial computation, so
live debug variable tracking loses information very quickly if we use
DBG_VALUE instructions.

This change moves processing of dbg.declare between argument lowering
and basic block isel, so that we can ask if an argument has a frame
index or not. If the argument lives in a register as is the case for
byval arguments on some targets, then we don't put it in the side table
and during ISel we emit DBG_VALUE instructions.

Reviewers: aprantl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32980

llvm-svn: 302483
This commit is contained in:
Reid Kleckner 2017-05-08 23:20:27 +00:00
parent 1eaac9f646
commit d320dddb9e
8 changed files with 284 additions and 108 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -1150,14 +1150,14 @@ bool FastISel::selectIntrinsicCall(const IntrinsicInst *II) {
return true;
}
unsigned Offset = 0;
// Byval arguments with frame indices were already handled after argument
// lowering and before isel.
const auto *Arg =
dyn_cast<Argument>(Address->stripInBoundsConstantOffsets());
if (Arg && FuncInfo.getArgumentFrameIndex(Arg) != INT_MAX)
return true;
Optional<MachineOperand> Op;
if (const auto *Arg = dyn_cast<Argument>(Address))
// Some arguments' frame index is recorded during argument lowering.
Offset = FuncInfo.getArgumentFrameIndex(Arg);
if (Offset)
Op = MachineOperand::CreateFI(Offset);
if (!Op)
if (unsigned Reg = lookUpRegForValue(Address))
Op = MachineOperand::CreateReg(Reg, false);

33
lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
View File

@ -85,7 +85,6 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
MF = &mf;
TLI = MF->getSubtarget().getTargetLowering();
RegInfo = &MF->getRegInfo();
MachineModuleInfo &MMI = MF->getMMI();
const TargetFrameLowering *TFI = MF->getSubtarget().getFrameLowering();
unsigned StackAlign = TFI->getStackAlignment();
@ -214,33 +213,6 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
if (!isa<AllocaInst>(I) || !StaticAllocaMap.count(cast<AllocaInst>(&I)))
InitializeRegForValue(&I);
// Collect llvm.dbg.declare information. This is done now instead of
// during the initial isel pass through the IR so that it is done
// in a predictable order.
if (const DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(&I)) {
assert(DI->getVariable() && "Missing variable");
assert(DI->getDebugLoc() && "Missing location");
if (MMI.hasDebugInfo()) {
// Don't handle byval struct arguments or VLAs, for example.
// Non-byval arguments are handled here (they refer to the stack
// temporary alloca at this point).
const Value *Address = DI->getAddress();
if (Address) {
if (const BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
Address = BCI->getOperand(0);
if (const AllocaInst *AI = dyn_cast<AllocaInst>(Address)) {
DenseMap<const AllocaInst *, int>::iterator SI =
StaticAllocaMap.find(AI);
if (SI != StaticAllocaMap.end()) { // Check for VLAs.
int FI = SI->second;
MF->setVariableDbgInfo(DI->getVariable(), DI->getExpression(),
FI, DI->getDebugLoc());
}
}
}
}
}
// Decide the preferred extend type for a value.
PreferredExtendType[&I] = getPreferredExtendForValue(&I);
}
@ -510,12 +482,11 @@ void FunctionLoweringInfo::setArgumentFrameIndex(const Argument *A,
/// If the argument does not have any assigned frame index then 0 is
/// returned.
int FunctionLoweringInfo::getArgumentFrameIndex(const Argument *A) {
DenseMap<const Argument *, int>::iterator I =
ByValArgFrameIndexMap.find(A);
auto I = ByValArgFrameIndexMap.find(A);
if (I != ByValArgFrameIndexMap.end())
return I->second;
DEBUG(dbgs() << "Argument does not have assigned frame index!\n");
return 0;
return INT_MAX;
}
unsigned FunctionLoweringInfo::getCatchPadExceptionPointerVReg(

10
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -4676,7 +4676,8 @@ bool SelectionDAGBuilder::EmitFuncArgumentDbgValue(
bool IsIndirect = false;
Optional<MachineOperand> Op;
// Some arguments' frame index is recorded during argument lowering.
if (int FI = FuncInfo.getArgumentFrameIndex(Arg))
int FI = FuncInfo.getArgumentFrameIndex(Arg);
if (FI != INT_MAX)
Op = MachineOperand::CreateFI(FI);
if (!Op && N.getNode()) {
@ -4927,6 +4928,13 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
return nullptr;
}
// Byval arguments with frame indices were already handled after argument
// lowering and before isel.
const auto *Arg =
dyn_cast<Argument>(Address->stripInBoundsConstantOffsets());
if (Arg && FuncInfo.getArgumentFrameIndex(Arg) != INT_MAX)
return nullptr;
SDValue &N = NodeMap[Address];
if (!N.getNode() && isa<Argument>(Address))
// Check unused arguments map.

48
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -38,6 +38,7 @@
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachinePassRegistry.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
@ -1145,6 +1146,51 @@ static void createSwiftErrorEntriesInEntryBlock(FunctionLoweringInfo *FuncInfo,
}
}
/// Collect llvm.dbg.declare information. This is done after argument lowering
/// in case the declarations refer to arguments.
static void processDbgDeclares(FunctionLoweringInfo *FuncInfo) {
MachineFunction *MF = FuncInfo->MF;
const DataLayout &DL = MF->getDataLayout();
for (const BasicBlock &BB : *FuncInfo->Fn) {
for (const Instruction &I : BB) {
const DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(&I);
if (!DI)
continue;
assert(DI->getVariable() && "Missing variable");
assert(DI->getDebugLoc() && "Missing location");
const Value *Address = DI->getAddress();
if (!Address)
continue;
// Look through casts and constant offset GEPs. These mostly come from
// inalloca.
APInt Offset(DL.getPointerSizeInBits(0), 0);
Address = Address->stripAndAccumulateInBoundsConstantOffsets(DL, Offset);
// Check if the variable is a static alloca or a byval or inalloca
// argument passed in memory. If it is not, then we will ignore this
// intrinsic and handle this during isel like dbg.value.
int FI = INT_MAX;
if (const auto *AI = dyn_cast<AllocaInst>(Address)) {
auto SI = FuncInfo->StaticAllocaMap.find(AI);
if (SI != FuncInfo->StaticAllocaMap.end())
FI = SI->second;
} else if (const auto *Arg = dyn_cast<Argument>(Address))
FI = FuncInfo->getArgumentFrameIndex(Arg);
if (FI == INT_MAX)
continue;
DIExpression *Expr = DI->getExpression();
if (Offset.getBoolValue())
Expr = DIExpression::prepend(Expr, DIExpression::NoDeref,
Offset.getZExtValue());
MF->setVariableDbgInfo(DI->getVariable(), Expr, FI, DI->getDebugLoc());
}
}
}
/// Propagate swifterror values through the machine function CFG.
static void propagateSwiftErrorVRegs(FunctionLoweringInfo *FuncInfo) {
auto *TLI = FuncInfo->TLI;
@ -1317,6 +1363,8 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
}
createSwiftErrorEntriesInEntryBlock(FuncInfo, FastIS, TLI, TII, SDB);
processDbgDeclares(FuncInfo);
// Iterate over all basic blocks in the function.
for (const BasicBlock *LLVMBB : RPOT) {
if (OptLevel != CodeGenOpt::None) {

12
test/CodeGen/X86/2010-01-18-DbgValue.ll
View File

@ -1,14 +1,18 @@
; RUN: llc -march=x86 -O0 < %s | FileCheck %s
; Currently, dbg.declare generates a DEBUG_VALUE comment. Eventually it will
; generate DWARF and this test will need to be modified or removed.
; RUN: llc -march=x86 -O0 < %s -filetype=obj | llvm-dwarfdump - | FileCheck %s
; CHECK-LABEL: .debug_info contents:
; CHECK-LABEL: DW_TAG_subprogram
; CHECK: DW_AT_name [DW_FORM_strp] ( {{.*}}"foo")
; CHECK: DW_TAG_formal_parameter
; CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (<0x2> 91 08 )
; CHECK-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"my_r0")
%struct.Pt = type { double, double }
%struct.Rect = type { %struct.Pt, %struct.Pt }
define double @foo(%struct.Rect* byval %my_r0) nounwind ssp !dbg !1 {
entry:
;CHECK: DEBUG_VALUE
%retval = alloca double ; <double*> [#uses=2]
%0 = alloca double ; <double*> [#uses=2]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]

51
test/CodeGen/X86/2012-11-30-handlemove-dbg.ll
View File

@ -1,51 +0,0 @@
; RUN: llc < %s -mtriple=x86_64-apple-macosx -enable-misched \
; RUN: -verify-machineinstrs | FileCheck %s
;
; Test LiveInterval update handling of DBG_VALUE.
; rdar://12777252.
;
; CHECK: %entry
; CHECK: DEBUG_VALUE: subdivp:hg
; CHECK: j
%struct.node.0.27 = type { i16, double, [3 x double], i32, i32 }
%struct.hgstruct.2.29 = type { %struct.bnode.1.28*, [3 x double], double, [3 x double] }
%struct.bnode.1.28 = type { i16, double, [3 x double], i32, i32, [3 x double], [3 x double], [3 x double], double, %struct.bnode.1.28*, %struct.bnode.1.28* }
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
define signext i16 @subdivp(%struct.node.0.27* nocapture %p, double %dsq, double %tolsq, %struct.hgstruct.2.29* nocapture byval align 8 %hg) nounwind uwtable readonly ssp !dbg !14 {
entry:
call void @llvm.dbg.declare(metadata %struct.hgstruct.2.29* %hg, metadata !4, metadata !DIExpression()), !dbg !DILocation(scope: !14)
%type = getelementptr inbounds %struct.node.0.27, %struct.node.0.27* %p, i64 0, i32 0
%0 = load i16, i16* %type, align 2
%cmp = icmp eq i16 %0, 1
br i1 %cmp, label %return, label %for.cond.preheader
for.cond.preheader: ; preds = %entry
%arrayidx6.1 = getelementptr inbounds %struct.hgstruct.2.29, %struct.hgstruct.2.29* %hg, i64 0, i32 1, i64 1
%cmp22 = fcmp olt double 0.000000e+00, %dsq
%conv24 = zext i1 %cmp22 to i16
br label %return
return: ; preds = %for.cond.preheader, %entry
%retval.0 = phi i16 [ %conv24, %for.cond.preheader ], [ 0, %entry ]
ret i16 %retval.0
}
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!12}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 168918) (llvm/trunk 168920)", isOptimized: true, emissionKind: FullDebug, file: !11, enums: !2, retainedTypes: !2, globals: !2)
!2 = !{}
!4 = !DILocalVariable(name: "hg", line: 725, arg: 4, scope: !14, file: !5, type: !6)
!5 = !DIFile(filename: "MultiSource/Benchmarks/Olden/bh/newbh.c", directory: "MultiSource/Benchmarks/Olden/bh")
!6 = !DIDerivedType(tag: DW_TAG_typedef, name: "hgstruct", line: 492, file: !11, baseType: !7)
!7 = !DICompositeType(tag: DW_TAG_structure_type, line: 487, size: 512, align: 64, file: !11)
!11 = !DIFile(filename: "MultiSource/Benchmarks/Olden/bh/newbh.c", directory: "MultiSource/Benchmarks/Olden/bh")
!12 = !{i32 1, !"Debug Info Version", i32 3}
!14 = distinct !DISubprogram(name: "subdivp", isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !11, scope: !5, type: !15)
!15 = !DISubroutineType(types: !16)
!16 = !{null}

62
test/CodeGen/X86/dbg-baseptr.ll
View File

@ -1,4 +1,5 @@
; RUN: llc -o - %s | FileCheck %s
; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump - | FileCheck %s --check-prefix=DWARF
; This test checks that parameters on the stack pointer are correctly
; referenced by debug info.
target triple = "x86_64--"
@ -7,24 +8,54 @@ target triple = "x86_64--"
@ptr = external global i32*
%struct.s = type { i32, i32, i32, i32, i32 }
; Simple case: no FP, use offset from RSP.
; CHECK-LABEL: f0:
; CHECK: DEBUG_VALUE: f:input <- [%RSP+8]
; CHECK-NOT: pushq
; CHECK: movl $42, %eax
; CHECK: retq
define i32 @f0(%struct.s* byval align 8 %input) !dbg !8 {
call void @llvm.dbg.declare(metadata %struct.s* %input, metadata !4, metadata !17), !dbg !18
ret i32 42
ret i32 42, !dbg !18
}
; DWARF-LABEL: .debug_info contents:
; DWARF-LABEL: DW_TAG_subprogram
; DWARF: DW_AT_frame_base [DW_FORM_exprloc] (<0x1> 57 )
; 0x57 -> RSP
; DWARF: DW_AT_name [DW_FORM_strp] ( {{.*}}"f0")
; DWARF: DW_TAG_formal_parameter
; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (<0x2> 91 08 )
; DW_OP_fbreg (0x91) 0x08
; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"input")
; Dynamic alloca forces the use of RBP as the base pointer
; CHECK-LABEL: f1:
; CHECK: DEBUG_VALUE: f:input <- [%RBP+16]
; CHECK: pushq %rbp
; CHECK: movl $42, %eax
; CHECK: popq %rbp
; CHECK: retq
define i32 @f1(%struct.s* byval align 8 %input) !dbg !19 {
%val = load i64, i64* @glob
; this alloca should force FP usage.
%stackspace = alloca i32, i64 %val, align 1
store i32* %stackspace, i32** @ptr
call void @llvm.dbg.declare(metadata %struct.s* %input, metadata !20, metadata !17), !dbg !21
ret i32 42
ret i32 42, !dbg !21
}
; DWARF-LABEL: DW_TAG_subprogram
; DWARF: DW_AT_frame_base [DW_FORM_exprloc] (<0x1> 56 )
; 0x56 -> RBP
; DWARF: DW_AT_name [DW_FORM_strp] ( {{.*}}"f1")
; DWARF: DW_TAG_formal_parameter
; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (<0x2> 91 10 )
; DW_OP_fbreg (0x91) 0x10
; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"input")
; CHECK-LABEL: f2:
; Just check that we are indeed aligning the stack and setting up a base pointer
; in RBX.
@ -34,17 +65,24 @@ define i32 @f1(%struct.s* byval align 8 %input) !dbg !19 {
; CHECK: andq $-64, %rsp
; CHECK: subq $64, %rsp
; CHECK: movq %rsp, %rbx
; The parameter should still be referenced through RBP though.
; CHECK-NOT: DEBUG_VALUE: f:input <- [%RBX
; CHECK: DEBUG_VALUE: f:input <- [%RBP+16]
define i32 @f2(%struct.s* byval align 8 %input) !dbg !22 {
%val = load i64, i64* @glob
%stackspace = alloca i32, i64 %val, align 64
store i32* %stackspace, i32** @ptr
call void @llvm.dbg.declare(metadata %struct.s* %input, metadata !23, metadata !17), !dbg !24
ret i32 42
ret i32 42, !dbg !24
}
; "input" should still be referred to through RBP.
; DWARF-LABEL: DW_TAG_subprogram
; DWARF: DW_AT_frame_base [DW_FORM_exprloc] (<0x1> 56 )
; 0x56 -> RBP
; DWARF: DW_AT_name [DW_FORM_strp] ( {{.*}}"f2")
; DWARF: DW_TAG_formal_parameter
; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (<0x2> 91 10 )
; DW_OP_fbreg (0x91) 0x10
; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"input")
declare void @llvm.dbg.declare(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
@ -52,7 +90,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)
!0 = !{i32 2, !"Dwarf Version", i32 4}
!1 = !{i32 2, !"Debug Info Version", i32 3}
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, emissionKind: FullDebug)
!3 = !DIFile(filename: "dbg-baseptr.ll", directory: "/")
!4 = !DILocalVariable(name: "input", arg: 1, scope: !8, file: !3, line: 5, type: !9)
!5 = !{}
@ -60,7 +98,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)
!6 = !DISubroutineType(types: !7)
!7 = !{!10, !9}
!8 = distinct !DISubprogram(name: "f", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, variables: !5)
!8 = distinct !DISubprogram(name: "f0", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, unit: !2, variables: !5)
!9 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", elements: !11)
!10 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
@ -74,9 +112,9 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)
!17 = !DIExpression()
!18 = !DILocation(line: 5, scope: !8)
!19 = distinct !DISubprogram(name: "f", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, variables: !5)
!19 = distinct !DISubprogram(name: "f1", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, variables: !5)
!20 = !DILocalVariable(name: "input", arg: 1, scope: !19, file: !3, line: 5, type: !9)
!21 = !DILocation(line: 5, scope: !19)
!22 = distinct !DISubprogram(name: "f", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, variables: !5)
!22 = distinct !DISubprogram(name: "f2", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, variables: !5)
!23 = !DILocalVariable(name: "input", arg: 1, scope: !22, file: !3, line: 5, type: !9)
!24 = !DILocation(line: 5, scope: !22)

158
test/DebugInfo/X86/dbg-declare-inalloca.ll Normal file
View File

@ -0,0 +1,158 @@
; RUN: llc -O0 < %s | FileCheck %s --check-prefix=CHECK --check-prefix=DEBUG
; RUN: llc < %s | FileCheck %s
; IR generated by the following source:
; struct NonTrivial {
; NonTrivial();// : x(42) {}
; ~NonTrivial();// {}
; int x;
; };
; extern "C" void g(int);// {}
; extern "C" void h(int);// {}
; extern "C" void f(NonTrivial a, int b, int unused, int c) {
; if (b) {
; g(c);
; } else {
; h(a.x);
; }
; (void)unused;
; }
; //int main() {
; // NonTrivial x;
; // f(x, 1, 2, 3);
; //}
;
; Remove C++ comments to have a complete, debuggable program.
; We don't need (or want) DBG_VALUE instructions to describe the location of
; inalloca arguments. We want frame indices in the side table, especially at
; -O0, because they are reliable across the entire function and don't require
; any propagation or analysis.
; CHECK: _f: # @f
; CHECK: Lfunc_begin0:
; CHECK-NOT: DEBUG_VALUE
; CHECK: [[start:Ltmp[0-9]+]]:
; CHECK-NOT: DEBUG_VALUE
; CHECK: cmpl
; CHECK: calll _g
; CHECK: calll _h
; CHECK: jmp "??1NonTrivial@@QAE@XZ"
; CHECK: [[end:Ltmp[0-9]+]]:
; CHECK: Lfunc_end0:
; FIXME: Optimized debug info should preserve this.
; DEBUG: .short 4414 # Record kind: S_LOCAL
; DEBUG: .asciz "a"
; DEBUG: .cv_def_range [[start]] [[end]]
; CHECK: .short 4414 # Record kind: S_LOCAL
; CHECK: .asciz "b"
; CHECK: .cv_def_range [[start]] [[end]]
; CHECK: .short 4414 # Record kind: S_LOCAL
; CHECK: .asciz "c"
; CHECK: .cv_def_range [[start]] [[end]]
; ModuleID = 't.cpp'
source_filename = "t.cpp"
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i386-pc-windows-msvc19.10.24728"
%struct.NonTrivial = type { i32 }
; Function Attrs: nounwind
define void @f(<{ %struct.NonTrivial, i32, i32, i32 }>* inalloca) local_unnamed_addr #0 !dbg !7 {
entry:
%a = getelementptr inbounds <{ %struct.NonTrivial, i32, i32, i32 }>, <{ %struct.NonTrivial, i32, i32, i32 }>* %0, i32 0, i32 0
%b = getelementptr inbounds <{ %struct.NonTrivial, i32, i32, i32 }>, <{ %struct.NonTrivial, i32, i32, i32 }>* %0, i32 0, i32 1
tail call void @llvm.dbg.declare(metadata i32* %c, metadata !20, metadata !24), !dbg !25
tail call void @llvm.dbg.declare(metadata i32* %b, metadata !22, metadata !24), !dbg !26
tail call void @llvm.dbg.declare(metadata %struct.NonTrivial* %a, metadata !23, metadata !24), !dbg !27
%1 = load i32, i32* %b, align 4, !dbg !28, !tbaa !30
%tobool = icmp eq i32 %1, 0, !dbg !28
br i1 %tobool, label %if.else, label %if.then, !dbg !34
if.then: ; preds = %entry
%c = getelementptr inbounds <{ %struct.NonTrivial, i32, i32, i32 }>, <{ %struct.NonTrivial, i32, i32, i32 }>* %0, i32 0, i32 3
%2 = load i32, i32* %c, align 4, !dbg !35, !tbaa !30
tail call void @g(i32 %2) #4, !dbg !37
br label %if.end, !dbg !38
if.else: ; preds = %entry
%x = getelementptr inbounds <{ %struct.NonTrivial, i32, i32, i32 }>, <{ %struct.NonTrivial, i32, i32, i32 }>* %0, i32 0, i32 0, i32 0, !dbg !39
%3 = load i32, i32* %x, align 4, !dbg !39, !tbaa !41
tail call void @h(i32 %3) #4, !dbg !43
br label %if.end
if.end: ; preds = %if.else, %if.then
tail call x86_thiscallcc void @"\01??1NonTrivial@@QAE@XZ"(%struct.NonTrivial* nonnull %a) #4, !dbg !44
ret void, !dbg !44
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @g(i32) local_unnamed_addr
declare void @h(i32) local_unnamed_addr
; Function Attrs: nounwind
declare x86_thiscallcc void @"\01??1NonTrivial@@QAE@XZ"(%struct.NonTrivial*) unnamed_addr #3
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone speculatable }
attributes #3 = { nounwind }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "e41e3fda2a91b52e121ed6c29a209eae")
!2 = !{}
!3 = !{i32 1, !"NumRegisterParameters", i32 0}
!4 = !{i32 2, !"CodeView", i32 1}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{!"clang version 5.0.0 "}
!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 8, type: !8, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !19)
!8 = !DISubroutineType(types: !9)
!9 = !{null, !10, !13, !13, !13}
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "NonTrivial", file: !1, line: 1, size: 32, elements: !11, identifier: ".?AUNonTrivial@@")
!11 = !{!12, !14, !18}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !10, file: !1, line: 4, baseType: !13, size: 32)
!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!14 = !DISubprogram(name: "NonTrivial", scope: !10, file: !1, line: 2, type: !15, isLocal: false, isDefinition: false, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true)
!15 = !DISubroutineType(cc: DW_CC_BORLAND_thiscall, types: !16)
!16 = !{null, !17}
!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 32, flags: DIFlagArtificial | DIFlagObjectPointer)
!18 = !DISubprogram(name: "~NonTrivial", scope: !10, file: !1, line: 3, type: !15, isLocal: false, isDefinition: false, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true)
!19 = !{!20, !21, !22, !23}
!20 = !DILocalVariable(name: "c", arg: 4, scope: !7, file: !1, line: 8, type: !13)
!21 = !DILocalVariable(name: "unused", arg: 3, scope: !7, file: !1, line: 8, type: !13)
!22 = !DILocalVariable(name: "b", arg: 2, scope: !7, file: !1, line: 8, type: !13)
!23 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 8, type: !10)
!24 = !DIExpression()
!25 = !DILocation(line: 8, column: 56, scope: !7)
!26 = !DILocation(line: 8, column: 37, scope: !7)
!27 = !DILocation(line: 8, column: 30, scope: !7)
!28 = !DILocation(line: 9, column: 7, scope: !29)
!29 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7)
!30 = !{!31, !31, i64 0}
!31 = !{!"int", !32, i64 0}
!32 = !{!"omnipotent char", !33, i64 0}
!33 = !{!"Simple C++ TBAA"}
!34 = !DILocation(line: 9, column: 7, scope: !7)
!35 = !DILocation(line: 10, column: 7, scope: !36)
!36 = distinct !DILexicalBlock(scope: !29, file: !1, line: 9, column: 10)
!37 = !DILocation(line: 10, column: 5, scope: !36)
!38 = !DILocation(line: 11, column: 3, scope: !36)
!39 = !DILocation(line: 12, column: 9, scope: !40)
!40 = distinct !DILexicalBlock(scope: !29, file: !1, line: 11, column: 10)
!41 = !{!42, !31, i64 0}
!42 = !{!"?AUNonTrivial@@", !31, i64 0}
!43 = !DILocation(line: 12, column: 5, scope: !40)
!44 = !DILocation(line: 15, column: 1, scope: !7)