[llvm] r282506 - Propagate DBG_VALUE entries when there are unvisited predecessors
Adrian Prantl via llvm-commits
llvm-commits at lists.llvm.org
Thu Sep 29 08:32:23 PDT 2016
> On Sep 29, 2016, at 12:28 AM, Daniel Berlin <dannyb at google.com> wrote:
>
>
>
> On Wed, Sep 28, 2016 at 11:01 PM, Mehdi Amini <mehdi.amini at apple.com <mailto:mehdi.amini at apple.com>> wrote:
> Hi,
>
> After this commit, an LTO link of llvm-tblgen with debug info is trigger many more calls to strlen().
> It is not calling it 21928214 (~22M) times, versus 12585102 (12.5M) before. And the livedebugvalues pass gets >3x slower (it is still only 3% of the total link time though).
>
> Is it expected?
>
> 3x slower seems a bit much, but it is actually solving the dataflow problem correctly now, instead of just dropping info on the floor somewhat randomly in certain cases.
>
> I expect this is all taken care of by the followup adrian had though, right?
Mehdi, could you try and re-run the benchmark with a revision after r282611? I'm hoping that this offsets the extra cost of r282506.
-- adrian
>
>
> The object file produced is slightly larger (31052564 after vs 30953876 before), which is due to the expected “better” debug info I guess.
>
> —
> Mehdi
>
> > On Sep 27, 2016, at 9:46 AM, Keith Walker via llvm-commits <llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>> wrote:
> >
> > Author: kwalker
> > Date: Tue Sep 27 11:46:07 2016
> > New Revision: 282506
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=282506&view=rev <http://llvm.org/viewvc/llvm-project?rev=282506&view=rev>
> > Log:
> > Propagate DBG_VALUE entries when there are unvisited predecessors
> >
> > Variables are sometimes missing their debug location information in
> > blocks in which the variables should be available. This would occur
> > when one or more predecessor blocks had not yet been visited by the
> > routine which propagated the information from predecessor blocks.
> >
> > This is addressed by only considering predecessor blocks which have
> > already been visited.
> >
> > The solution to this problem was suggested by Daniel Berlin on the
> > LLVM developer mailing list.
> >
> > Differential Revision: https://reviews.llvm.org/D24927 <https://reviews.llvm.org/D24927>
> >
> > Added:
> > llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir
> > Modified:
> > llvm/trunk/lib/CodeGen/LiveDebugValues.cpp
> >
> > Modified: llvm/trunk/lib/CodeGen/LiveDebugValues.cpp
> > URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveDebugValues.cpp?rev=282506&r1=282505&r2=282506&view=diff <http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveDebugValues.cpp?rev=282506&r1=282505&r2=282506&view=diff>
> > ==============================================================================
> > --- llvm/trunk/lib/CodeGen/LiveDebugValues.cpp (original)
> > +++ llvm/trunk/lib/CodeGen/LiveDebugValues.cpp Tue Sep 27 11:46:07 2016
> > @@ -201,7 +201,8 @@ private:
> > VarLocInMBB &OutLocs, VarLocMap &VarLocIDs);
> >
> > bool join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs, VarLocInMBB &InLocs,
> > - const VarLocMap &VarLocIDs);
> > + const VarLocMap &VarLocIDs,
> > + SmallPtrSet<const MachineBasicBlock *, 16> &Visited);
> >
> > bool ExtendRanges(MachineFunction &MF);
> >
> > @@ -368,7 +369,8 @@ bool LiveDebugValues::transfer(MachineIn
> > /// inserting a new DBG_VALUE instruction at the start of the @MBB - if the same
> > /// source variable in all the predecessors of @MBB reside in the same location.
> > bool LiveDebugValues::join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs,
> > - VarLocInMBB &InLocs, const VarLocMap &VarLocIDs) {
> > + VarLocInMBB &InLocs, const VarLocMap &VarLocIDs,
> > + SmallPtrSet<const MachineBasicBlock *, 16> &Visited) {
> > DEBUG(dbgs() << "join MBB: " << MBB.getName() << "\n");
> > bool Changed = false;
> >
> > @@ -376,21 +378,32 @@ bool LiveDebugValues::join(MachineBasicB
> >
> > // For all predecessors of this MBB, find the set of VarLocs that
> > // can be joined.
> > + int NumVisited = 0;
> > for (auto p : MBB.predecessors()) {
> > + // Ignore unvisited predecessor blocks. As we are processing
> > + // the blocks in reverse post-order any unvisited block can
> > + // be considered to not remove any incoming values.
> > + if (!Visited.count(p))
> > + continue;
> > auto OL = OutLocs.find(p);
> > // Join is null in case of empty OutLocs from any of the pred.
> > if (OL == OutLocs.end())
> > return false;
> >
> > - // Just copy over the Out locs to incoming locs for the first predecessor.
> > - if (p == *MBB.pred_begin()) {
> > + // Just copy over the Out locs to incoming locs for the first visited
> > + // predecessor, and for all other predecessors join the Out locs.
> > + if (!NumVisited)
> > InLocsT = OL->second;
> > - continue;
> > - }
> > - // Join with this predecessor.
> > - InLocsT &= OL->second;
> > + else
> > + InLocsT &= OL->second;
> > + NumVisited++;
> > }
> >
> > + // As we are processing blocks in reverse post-order we
> > + // should have processed at least one predecessor, unless it
> > + // is the entry block which has no predecessor.
> > + assert((NumVisited || MBB.pred_empty()) &&
> > + "Should have processed at least one predecessor");
> > if (InLocsT.empty())
> > return false;
> >
> > @@ -463,6 +476,7 @@ bool LiveDebugValues::ExtendRanges(Machi
> > // To solve it, we perform join() and transfer() using the two worklist method
> > // until the ranges converge.
> > // Ranges have converged when both worklists are empty.
> > + SmallPtrSet<const MachineBasicBlock *, 16> Visited;
> > while (!Worklist.empty() || !Pending.empty()) {
> > // We track what is on the pending worklist to avoid inserting the same
> > // thing twice. We could avoid this with a custom priority queue, but this
> > @@ -472,8 +486,8 @@ bool LiveDebugValues::ExtendRanges(Machi
> > while (!Worklist.empty()) {
> > MachineBasicBlock *MBB = OrderToBB[Worklist.top()];
> > Worklist.pop();
> > - MBBJoined = join(*MBB, OutLocs, InLocs, VarLocIDs);
> > -
> > + MBBJoined = join(*MBB, OutLocs, InLocs, VarLocIDs, Visited);
> > + Visited.insert(MBB);
> > if (MBBJoined) {
> > MBBJoined = false;
> > Changed = true;
> >
> > Added: llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir
> > URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir?rev=282506&view=auto <http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir?rev=282506&view=auto>
> > ==============================================================================
> > --- llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir (added)
> > +++ llvm/trunk/test/CodeGen/ARM/dbg-range-extension.mir Tue Sep 27 11:46:07 2016
> > @@ -0,0 +1,282 @@
> > +# RUN: llc -mtriple=arm-eabi -run-pass=livedebugvalues %s -o - | FileCheck %s
> > +#
> > +# Check that the debug information for variables are propagated into the correct blocks.
> > +#
> > +# Generated from the C source:
> > +#
> > +# int func2(int, int);
> > +# void func(int a) {
> > +# int b = func2(10, 11);
> > +# if (a) {
> > +# int c = func2(12, 13);
> > +# for(int i = 1; i < a; i++) {
> > +# func2(i, i+b);
> > +# }
> > +# func2(b,c);
> > +# }
> > +# func2(b,a);
> > +# }
> > +
> > +# CHECK: [[VAR_A:![0-9]+]] = !DILocalVariable(name: "a",
> > +# CHECK: [[VAR_B:![0-9]+]] = !DILocalVariable(name: "b",
> > +# CHECK: [[VAR_C:![0-9]+]] = !DILocalVariable(name: "c",
> > +# CHECK: [[VAR_I:![0-9]+]] = !DILocalVariable(name: "i",
> > +
> > +# CHECK: bb.0.entry
> > +# CHECK: DBG_VALUE debug-use %r0, debug-use _, [[VAR_A]]
> > +# CHECK: DBG_VALUE debug-use [[REG_A:%r[0-9]+]], debug-use _, [[VAR_A]]
> > +# CHECK: DBG_VALUE debug-use [[REG_B:%r[0-9]+]], debug-use _, [[VAR_B]]
> > +
> > +# CHECK: bb.1.if.then
> > +# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
> > +# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
> > +# CHECK: DBG_VALUE debug-use [[REG_C:%r[0-9]+]], debug-use _, [[VAR_C]]
> > +# CHECK: DBG_VALUE 1, 0, [[VAR_I]]
> > +
> > +# CHECK: bb.2.for.body
> > +# CHECK: DBG_VALUE debug-use [[REG_I:%r[0-9]+]], debug-use _, [[VAR_I]]
> > +# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
> > +# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
> > +# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
> > +# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
> > +
> > +# CHECK: bb.3.for.cond
> > +# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
> > +# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
> > +# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
> > +# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
> > +
> > +# CHECK: bb.4.for.cond.cleanup
> > +# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use _, [[VAR_I]]
> > +# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use _, [[VAR_C]]
> > +# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
> > +# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
> > +
> > +# CHECK: bb.5.if.end
> > +# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use _, [[VAR_B]]
> > +# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use _, [[VAR_A]]
> > +--- |
> > + ; ModuleID = '/data/kwalker/work/OpenSource-llvm/llvm/test/CodeGen/ARM/dbg-range-extension.ll'
> > + source_filename = "/data/kwalker/work/OpenSource-llvm/llvm/test/CodeGen/ARM/dbg-range-extension.ll"
> > + target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
> > + target triple = "arm---eabi"
> > +
> > + ; Function Attrs: minsize nounwind optsize
> > + define void @func(i32 %a) local_unnamed_addr #0 !dbg !8 {
> > + entry:
> > + tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !13, metadata !20), !dbg !21
> > + %call = tail call i32 @func2(i32 10, i32 11) #0, !dbg !22
> > + tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !20), !dbg !23
> > + %tobool = icmp eq i32 %a, 0, !dbg !24
> > + br i1 %tobool, label %if.end, label %if.then, !dbg !25
> > +
> > + if.then: ; preds = %entry
> > + %call1 = tail call i32 @func2(i32 12, i32 13) #0, !dbg !26
> > + tail call void @llvm.dbg.value(metadata i32 %call1, i64 0, metadata !15, metadata !20), !dbg !27
> > + tail call void @llvm.dbg.value(metadata i32 1, i64 0, metadata !18, metadata !20), !dbg !28
> > + br label %for.cond, !dbg !29
> > +
> > + for.cond: ; preds = %for.body, %if.then
> > + %i.0 = phi i32 [ 1, %if.then ], [ %inc, %for.body ]
> > + tail call void @llvm.dbg.value(metadata i32 %i.0, i64 0, metadata !18, metadata !20), !dbg !28
> > + %cmp = icmp slt i32 %i.0, %a, !dbg !30
> > + br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !33
> > +
> > + for.cond.cleanup: ; preds = %for.cond
> > + %call3 = tail call i32 @func2(i32 %call, i32 %call1) #0, !dbg !34
> > + br label %if.end, !dbg !35
> > +
> > + for.body: ; preds = %for.cond
> > + %0 = add i32 %call, %i.0, !dbg !36
> > + %call2 = tail call i32 @func2(i32 %i.0, i32 %0) #0, !dbg !36
> > + %inc = add nuw nsw i32 %i.0, 1, !dbg !38
> > + tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !18, metadata !20), !dbg !28
> > + br label %for.cond, !dbg !40, !llvm.loop !41
> > +
> > + if.end: ; preds = %for.cond.cleanup, %entry
> > + %call4 = tail call i32 @func2(i32 %call, i32 %a) #0, !dbg !43
> > + ret void, !dbg !44
> > + }
> > +
> > + ; Function Attrs: minsize optsize
> > + declare i32 @func2(i32, i32) local_unnamed_addr #1
> > +
> > + ; Function Attrs: nounwind readnone
> > + declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
> > +
> > + ; Function Attrs: nounwind
> > + declare void @llvm.stackprotector(i8*, i8**) #3
> > +
> > + attributes #0 = { minsize nounwind optsize }
> > + attributes #1 = { minsize optsize }
> > + attributes #2 = { nounwind readnone }
> > + attributes #3 = { nounwind }
> > +
> > + !llvm.dbg.cu <http://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", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
> > + !1 = !DIFile(filename: "loop.c", directory: "/tmp")
> > + !2 = !{}
> > + !3 = !{i32 2, !"Dwarf Version", i32 4}
> > + !4 = !{i32 2, !"Debug Info Version", i32 3}
> > + !5 = !{i32 1, !"wchar_size", i32 4}
> > + !6 = !{i32 1, !"min_enum_size", i32 4}
> > + !7 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git <http://llvm.org/git/clang.git> b8f10df3679b36f51e1de7c4351b82d297825089) (http://llvm.org/git/llvm.git <http://llvm.org/git/llvm.git> c2a5d16d1e3b8c49f5bbb1ff87a76ac4f88edb89)"}
> > + !8 = distinct !DISubprogram(name: "func", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !12)
> > + !9 = !DISubroutineType(types: !10)
> > + !10 = !{null, !11}
> > + !11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
> > + !12 = !{!13, !14, !15, !18}
> > + !13 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
> > + !14 = !DILocalVariable(name: "b", scope: !8, file: !1, line: 3, type: !11)
> > + !15 = !DILocalVariable(name: "c", scope: !16, file: !1, line: 5, type: !11)
> > + !16 = distinct !DILexicalBlock(scope: !17, file: !1, line: 4, column: 9)
> > + !17 = distinct !DILexicalBlock(scope: !8, file: !1, line: 4, column: 6)
> > + !18 = !DILocalVariable(name: "i", scope: !19, file: !1, line: 6, type: !11)
> > + !19 = distinct !DILexicalBlock(scope: !16, file: !1, line: 6, column: 3)
> > + !20 = !DIExpression()
> > + !21 = !DILocation(line: 2, column: 15, scope: !8)
> > + !22 = !DILocation(line: 3, column: 17, scope: !8)
> > + !23 = !DILocation(line: 3, column: 13, scope: !8)
> > + !24 = !DILocation(line: 4, column: 6, scope: !17)
> > + !25 = !DILocation(line: 4, column: 6, scope: !8)
> > + !26 = !DILocation(line: 5, column: 11, scope: !16)
> > + !27 = !DILocation(line: 5, column: 7, scope: !16)
> > + !28 = !DILocation(line: 6, column: 11, scope: !19)
> > + !29 = !DILocation(line: 6, column: 7, scope: !19)
> > + !30 = !DILocation(line: 6, column: 20, scope: !31)
> > + !31 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 1)
> > + !32 = distinct !DILexicalBlock(scope: !19, file: !1, line: 6, column: 3)
> > + !33 = !DILocation(line: 6, column: 3, scope: !31)
> > + !34 = !DILocation(line: 9, column: 3, scope: !16)
> > + !35 = !DILocation(line: 10, column: 2, scope: !16)
> > + !36 = !DILocation(line: 7, column: 4, scope: !37)
> > + !37 = distinct !DILexicalBlock(scope: !32, file: !1, line: 6, column: 30)
> > + !38 = !DILocation(line: 6, column: 26, scope: !39)
> > + !39 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 3)
> > + !40 = !DILocation(line: 6, column: 3, scope: !39)
> > + !41 = distinct !{!41, !42}
> > + !42 = !DILocation(line: 6, column: 3, scope: !16)
> > + !43 = !DILocation(line: 11, column: 2, scope: !8)
> > + !44 = !DILocation(line: 12, column: 1, scope: !8)
> > +
> > +...
> > +---
> > +name: func
> > +alignment: 2
> > +exposesReturnsTwice: false
> > +legalized: false
> > +regBankSelected: false
> > +selected: false
> > +tracksRegLiveness: false
> > +liveins:
> > + - { reg: '%r0' }
> > +calleeSavedRegisters: [ '%lr', '%d8', '%d9', '%d10', '%d11', '%d12', '%d13',
> > + '%d14', '%d15', '%q4', '%q5', '%q6', '%q7', '%r4',
> > + '%r5', '%r6', '%r7', '%r8', '%r9', '%r10', '%r11',
> > + '%s16', '%s17', '%s18', '%s19', '%s20', '%s21',
> > + '%s22', '%s23', '%s24', '%s25', '%s26', '%s27',
> > + '%s28', '%s29', '%s30', '%s31', '%d8_d10', '%d9_d11',
> > + '%d10_d12', '%d11_d13', '%d12_d14', '%d13_d15',
> > + '%q4_q5', '%q5_q6', '%q6_q7', '%q4_q5_q6_q7', '%r4_r5',
> > + '%r6_r7', '%r8_r9', '%r10_r11', '%d8_d9_d10', '%d9_d10_d11',
> > + '%d10_d11_d12', '%d11_d12_d13', '%d12_d13_d14',
> > + '%d13_d14_d15', '%d8_d10_d12', '%d9_d11_d13', '%d10_d12_d14',
> > + '%d11_d13_d15', '%d8_d10_d12_d14', '%d9_d11_d13_d15',
> > + '%d9_d10', '%d11_d12', '%d13_d14', '%d9_d10_d11_d12',
> > + '%d11_d12_d13_d14' ]
> > +frameInfo:
> > + isFrameAddressTaken: false
> > + isReturnAddressTaken: false
> > + hasStackMap: false
> > + hasPatchPoint: false
> > + stackSize: 24
> > + offsetAdjustment: 0
> > + maxAlignment: 4
> > + adjustsStack: true
> > + hasCalls: true
> > + maxCallFrameSize: 0
> > + hasOpaqueSPAdjustment: false
> > + hasVAStart: false
> > + hasMustTailInVarArgFunc: false
> > +stack:
> > + - { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, callee-saved-register: '%lr' }
> > + - { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '%r11' }
> > + - { id: 2, type: spill-slot, offset: -12, size: 4, alignment: 4, callee-saved-register: '%r7' }
> > + - { id: 3, type: spill-slot, offset: -16, size: 4, alignment: 4, callee-saved-register: '%r6' }
> > + - { id: 4, type: spill-slot, offset: -20, size: 4, alignment: 4, callee-saved-register: '%r5' }
> > + - { id: 5, type: spill-slot, offset: -24, size: 4, alignment: 4, callee-saved-register: '%r4' }
> > +body: |
> > + bb.0.entry:
> > + successors: %bb.5.if.end, %bb.1.if.then
> > + liveins: %r0, %r4, %r5, %r6, %r7, %r11, %lr
> > +
> > + %sp = frame-setup STMDB_UPD %sp, 14, _, killed %r4, killed %r5, killed %r6, killed %r7, killed %r11, killed %lr
> > + frame-setup CFI_INSTRUCTION def_cfa_offset 24
> > + frame-setup CFI_INSTRUCTION offset %lr, -4
> > + frame-setup CFI_INSTRUCTION offset %r11, -8
> > + frame-setup CFI_INSTRUCTION offset %r7, -12
> > + frame-setup CFI_INSTRUCTION offset %r6, -16
> > + frame-setup CFI_INSTRUCTION offset %r5, -20
> > + frame-setup CFI_INSTRUCTION offset %r4, -24
> > + DBG_VALUE debug-use %r0, debug-use _, !13, !20, debug-location !21
> > + %r4 = MOVr killed %r0, 14, _, _
> > + DBG_VALUE debug-use %r4, debug-use _, !13, !20, debug-location !21
> > + %r0 = MOVi 10, 14, _, _, debug-location !22
> > + %r1 = MOVi 11, 14, _, _, debug-location !22
> > + BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def %r0, debug-location !22
> > + %r5 = MOVr killed %r0, 14, _, _, debug-location !22
> > + DBG_VALUE debug-use %r5, debug-use _, !14, !20, debug-location !23
> > + CMPri %r4, 0, 14, _, implicit-def %cpsr, debug-location !25
> > + Bcc %bb.5.if.end, 0, killed %cpsr
> > +
> > + bb.1.if.then:
> > + successors: %bb.3.for.cond
> > + liveins: %r4, %r5
> > +
> > + %r0 = MOVi 12, 14, _, _, debug-location !26
> > + %r1 = MOVi 13, 14, _, _, debug-location !26
> > + BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def %r0, debug-location !26
> > + %r6 = MOVr killed %r0, 14, _, _, debug-location !26
> > + DBG_VALUE debug-use %r6, debug-use _, !15, !20, debug-location !27
> > + %r7 = MOVi 1, 14, _, _
> > + DBG_VALUE 1, 0, !18, !20, debug-location !28
> > + B %bb.3.for.cond
> > +
> > + bb.2.for.body:
> > + successors: %bb.3.for.cond
> > + liveins: %r4, %r5, %r6, %r7
> > +
> > + %r1 = ADDrr %r5, %r7, 14, _, _, debug-location !36
> > + %r0 = MOVr %r7, 14, _, _, debug-location !36
> > + BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def dead %r0, debug-location !36
> > + %r7 = ADDri killed %r7, 1, 14, _, _, debug-location !38
> > + DBG_VALUE debug-use %r7, debug-use _, !18, !20, debug-location !28
> > +
> > + bb.3.for.cond:
> > + successors: %bb.2.for.body, %bb.4.for.cond.cleanup
> > + liveins: %r4, %r5, %r6, %r7
> > +
> > + DBG_VALUE debug-use %r7, debug-use _, !18, !20, debug-location !28
> > + CMPrr %r7, %r4, 14, _, implicit-def %cpsr, debug-location !33
> > + Bcc %bb.2.for.body, 11, killed %cpsr, debug-location !33
> > +
> > + bb.4.for.cond.cleanup:
> > + successors: %bb.5.if.end
> > + liveins: %r4, %r5, %r6
> > +
> > + %r0 = MOVr %r5, 14, _, _, debug-location !34
> > + %r1 = MOVr killed %r6, 14, _, _, debug-location !34
> > + BL @func2, csr_aapcs, implicit-def dead %lr, implicit %sp, implicit killed %r0, implicit killed %r1, implicit-def %sp, implicit-def dead %r0, debug-location !34
> > +
> > + bb.5.if.end:
> > + liveins: %r4, %r5
> > +
> > + %r0 = MOVr killed %r5, 14, _, _, debug-location !43
> > + %r1 = MOVr killed %r4, 14, _, _, debug-location !43
> > + %sp = LDMIA_UPD %sp, 14, _, def %r4, def %r5, def %r6, def %r7, def %r11, def %lr, debug-location !43
> > + TAILJMPd @func2, implicit %sp, implicit %sp, implicit killed %r0, implicit killed %r1, debug-location !43
> > +
> > +...
> >
> >
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits <http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits>
>
>
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