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When the source has a series of assignments, users reasonably want to
have the debugger step through each one individually. Turn off the combine for adjacent stores at -O0 so we get this behavior. Possibly, DAGCombine shouldn't run at all at -O0, but that's for another day; see PR22346. Differential Revision: http://reviews.llvm.org/D7181 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230659 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Paul Robinson
parent
69d2539554
commit
b2f521b647
@ -10055,6 +10055,9 @@ bool DAGCombiner::MergeStoresOfConstantsOrVecElts(
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}
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bool DAGCombiner::MergeConsecutiveStores(StoreSDNode* St) {
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if (OptLevel == CodeGenOpt::None)
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return false;
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EVT MemVT = St->getMemoryVT();
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int64_t ElementSizeBytes = MemVT.getSizeInBits()/8;
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bool NoVectors = DAG.getMachineFunction().getFunction()->hasFnAttribute(
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113
test/CodeGen/X86/dbg-combine.ll
Normal file
113
test/CodeGen/X86/dbg-combine.ll
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@ -0,0 +1,113 @@
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; RUN: llc -mtriple x86_64-pc-linux -O0 < %s | FileCheck %s
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; Make sure that the sequence of debug locations for function foo is correctly
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; generated. More specifically, .loc entries for lines 4,5,6,7 must appear in
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; the correct sequence.
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; $ clang -emit-llvm -S -g dbg-combine.c
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; 1. int foo()
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; 2. {
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; 3. int elems = 3;
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; 4. int array1[elems];
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; 5. array1[0]=0;
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; 6. array1[1]=1;
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; 7. array1[2]=2;
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; 8. int array2[elems];
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; 9. array2[0]=1;
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; 10. return array2[0];
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; 11. }
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; CHECK: .loc 1 4
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; CHECK: .loc 1 5
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; CHECK: .loc 1 6
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; CHECK: .loc 1 7
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; ModuleID = 'dbg-combine.c'
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; Function Attrs: nounwind uwtable
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define i32 @foo() #0 {
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entry:
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%elems = alloca i32, align 4
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%saved_stack = alloca i8*
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%cleanup.dest.slot = alloca i32
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call void @llvm.dbg.declare(metadata i32* %elems, metadata !12, metadata !13), !dbg !14
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store i32 3, i32* %elems, align 4, !dbg !14
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%0 = load i32* %elems, align 4, !dbg !15
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%1 = zext i32 %0 to i64, !dbg !16
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%2 = call i8* @llvm.stacksave(), !dbg !16
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store i8* %2, i8** %saved_stack, !dbg !16
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%vla = alloca i32, i64 %1, align 16, !dbg !16
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call void @llvm.dbg.declare(metadata i32* %vla, metadata !17, metadata !21), !dbg !22
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%arrayidx = getelementptr inbounds i32* %vla, i64 0, !dbg !23
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store i32 0, i32* %arrayidx, align 4, !dbg !24
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%arrayidx1 = getelementptr inbounds i32* %vla, i64 1, !dbg !25
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store i32 1, i32* %arrayidx1, align 4, !dbg !26
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%arrayidx2 = getelementptr inbounds i32* %vla, i64 2, !dbg !27
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store i32 2, i32* %arrayidx2, align 4, !dbg !28
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%3 = load i32* %elems, align 4, !dbg !29
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%4 = zext i32 %3 to i64, !dbg !30
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%vla3 = alloca i32, i64 %4, align 16, !dbg !30
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call void @llvm.dbg.declare(metadata i32* %vla3, metadata !31, metadata !21), !dbg !32
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%arrayidx4 = getelementptr inbounds i32* %vla3, i64 0, !dbg !33
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store i32 1, i32* %arrayidx4, align 4, !dbg !34
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%arrayidx5 = getelementptr inbounds i32* %vla3, i64 0, !dbg !35
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%5 = load i32* %arrayidx5, align 4, !dbg !35
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store i32 1, i32* %cleanup.dest.slot
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%6 = load i8** %saved_stack, !dbg !36
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call void @llvm.stackrestore(i8* %6), !dbg !36
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ret i32 %5, !dbg !36
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind
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declare i8* @llvm.stacksave() #2
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; Function Attrs: nounwind
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declare void @llvm.stackrestore(i8*) #2
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = !{!"0x11\0012\00clang version 3.7.0 (trunk 227074)\000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/home/probinson/projects/scratch/dbg-combine.c] [DW_LANG_C99]
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!1 = !{!"dbg-combine.c", !"/home/probinson/projects/scratch"}
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!2 = !{}
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!3 = !{!4}
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!4 = !{!"0x2e\00foo\00foo\00\001\000\001\000\000\000\000\002", !1, !5, !6, null, i32 ()* @foo, null, null, !2} ; [ DW_TAG_subprogram ] [line 1] [def] [scope 2] [foo]
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!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [/home/probinson/projects/scratch/dbg-combine.c]
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!6 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!7 = !{!8}
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!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 2, !"Debug Info Version", i32 2}
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!11 = !{!"clang version 3.7.0 (trunk 227074)"}
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!12 = !{!"0x100\00elems\003\000", !4, !5, !8} ; [ DW_TAG_auto_variable ] [elems] [line 3]
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!13 = !{!"0x102"} ; [ DW_TAG_expression ]
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!14 = !MDLocation(line: 3, column: 8, scope: !4)
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!15 = !MDLocation(line: 4, column: 15, scope: !4)
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!16 = !MDLocation(line: 4, column: 4, scope: !4)
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!17 = !{!"0x100\00array1\004\000", !4, !5, !18} ; [ DW_TAG_auto_variable ] [array1] [line 4]
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!18 = !{!"0x1\00\000\000\0032\000\000\000", null, null, !8, !19, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
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!19 = !{!20}
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!20 = !{!"0x21\000\00-1"} ; [ DW_TAG_subrange_type ] [unbounded]
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!21 = !{!"0x102\006"} ; [ DW_TAG_expression ] [DW_OP_deref]
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!22 = !MDLocation(line: 4, column: 8, scope: !4)
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!23 = !MDLocation(line: 5, column: 4, scope: !4)
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!24 = !MDLocation(line: 5, column: 13, scope: !4)
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!25 = !MDLocation(line: 6, column: 4, scope: !4)
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!26 = !MDLocation(line: 6, column: 13, scope: !4)
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!27 = !MDLocation(line: 7, column: 4, scope: !4)
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!28 = !MDLocation(line: 7, column: 13, scope: !4)
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!29 = !MDLocation(line: 8, column: 15, scope: !4)
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!30 = !MDLocation(line: 8, column: 4, scope: !4)
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!31 = !{!"0x100\00array2\008\000", !4, !5, !18} ; [ DW_TAG_auto_variable ] [array2] [line 8]
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!32 = !MDLocation(line: 8, column: 8, scope: !4)
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!33 = !MDLocation(line: 9, column: 4, scope: !4)
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!34 = !MDLocation(line: 9, column: 13, scope: !4)
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!35 = !MDLocation(line: 10, column: 11, scope: !4)
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!36 = !MDLocation(line: 11, column: 1, scope: !4)
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