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llvm-mirror/test/DebugInfo/X86/location-range-inlined-xblock.mir
OCHyams 4d679a7eae [DwarfDebug] Improve multi-BB single location detection in validThroughout (3/4) 
With the changes introduced in D86151 we can now check for single locations
which span multiple blocks for inlined scopes and blocks.

D86151 introduced the InstructionOrdering parameter, replacing a scan through
MBB instructions. The functionality to compare instruction positions across
blocks was add there, and this patch just removes the exit checks that were
previously (but no longer) required.

CTMark shows a geomean binary size reduction of 2.2% for RelWithDebInfo builds.
llvm-locstats (using D85636) shows a very small variable location coverage
change in 5 of 10 binaries, but just like in D86151 it is only in the order of
10s of bytes.

Reviewed By: djtodoro

Differential Revision: https://reviews.llvm.org/D86152
2020-08-27 11:52:29 +01:00

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# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
# RUN: | llvm-dwarfdump -v --name local - \
# RUN: | FileCheck %s
#
## Generated with opt -inline -mem2reg, llc -stop-after=livedebugvalues from:
## int glob;
## int ext1(int);
## int ext2(int);
##
## __attribute__((always_inline))
## static int inline_me() {
## int local = glob;
## int r = 0;
## if (local)
## r = ext1(local);
## else
## r = ext2(local);
## return r * local;
## }
##
## int fun(int p) {
## glob = p;
## glob = inline_me();
## return 0;
## }
##
## Check that the location for inlined variable 'local' (RBX), which spans
## multiple basic blocks, is given a single location.
#
# CHECK: DW_AT_location [DW_FORM_exprloc] (DW_OP_reg3 RBX)
# CHECK-NEXT: DW_AT_abstract_origin [DW_FORM_ref4] ({{.*}}"local")
--- |
target triple = "x86_64-unknown-linux-gnu"
@glob = dso_local global i32 0, align 4, !dbg !0
define dso_local i32 @_Z3funi(i32 %p) !dbg !11 {
entry:
call void @llvm.dbg.value(metadata i32 %p, metadata !15, metadata !DIExpression()), !dbg !16
store i32 %p, i32* @glob, align 4, !dbg !17
%0 = load i32, i32* @glob, align 4, !dbg !22
call void @llvm.dbg.value(metadata i32 %0, metadata !27, metadata !DIExpression()), !dbg !30
call void @llvm.dbg.value(metadata i32 0, metadata !28, metadata !DIExpression()), !dbg !30
%tobool.i = icmp ne i32 %0, 0, !dbg !31
br i1 %tobool.i, label %if.then.i, label %if.else.i, !dbg !33
if.then.i: ; preds = %entry
%call.i = call i32 @_Z4ext1i(i32 %0), !dbg !34
call void @llvm.dbg.value(metadata i32 %call.i, metadata !28, metadata !DIExpression()), !dbg !30
br label %_ZL9inline_mev.exit, !dbg !35
if.else.i: ; preds = %entry
%call1.i = call i32 @_Z4ext2i(i32 %0), !dbg !36
call void @llvm.dbg.value(metadata i32 %call1.i, metadata !28, metadata !DIExpression()), !dbg !30
br label %_ZL9inline_mev.exit
_ZL9inline_mev.exit: ; preds = %if.else.i, %if.then.i
%r.0.i = phi i32 [ %call.i, %if.then.i ], [ %call1.i, %if.else.i ], !dbg !37
call void @llvm.dbg.value(metadata i32 %r.0.i, metadata !28, metadata !DIExpression()), !dbg !30
%mul.i = mul nsw i32 %r.0.i, %0, !dbg !38
store i32 %mul.i, i32* @glob, align 4, !dbg !39
ret i32 0, !dbg !40
}
declare !dbg !41 dso_local i32 @_Z4ext1i(i32)
declare !dbg !42 dso_local i32 @_Z4ext2i(i32)
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8, !9}
!llvm.ident = !{!10}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "glob", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.cpp", directory: "/")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 7, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{!"clang version 12.0.0"}
!11 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funi", scope: !3, file: !3, line: 16, type: !12, scopeLine: 16, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !14)
!12 = !DISubroutineType(types: !13)
!13 = !{!6, !6}
!14 = !{!15}
!15 = !DILocalVariable(name: "p", arg: 1, scope: !11, file: !3, line: 16, type: !6)
!16 = !DILocation(line: 0, scope: !11)
!17 = !DILocation(line: 17, column: 8, scope: !11)
!22 = !DILocation(line: 7, column: 15, scope: !23, inlinedAt: !29)
!23 = distinct !DISubprogram(name: "inline_me", linkageName: "_ZL9inline_mev", scope: !3, file: !3, line: 6, type: !24, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !26)
!24 = !DISubroutineType(types: !25)
!25 = !{!6}
!26 = !{!27, !28}
!27 = !DILocalVariable(name: "local", scope: !23, file: !3, line: 7, type: !6)
!28 = !DILocalVariable(name: "r", scope: !23, file: !3, line: 8, type: !6)
!29 = distinct !DILocation(line: 18, column: 10, scope: !11)
!30 = !DILocation(line: 0, scope: !23, inlinedAt: !29)
!31 = !DILocation(line: 9, column: 7, scope: !32, inlinedAt: !29)
!32 = distinct !DILexicalBlock(scope: !23, file: !3, line: 9, column: 7)
!33 = !DILocation(line: 9, column: 7, scope: !23, inlinedAt: !29)
!34 = !DILocation(line: 10, column: 9, scope: !32, inlinedAt: !29)
!35 = !DILocation(line: 10, column: 5, scope: !32, inlinedAt: !29)
!36 = !DILocation(line: 12, column: 9, scope: !32, inlinedAt: !29)
!37 = !DILocation(line: 0, scope: !32, inlinedAt: !29)
!38 = !DILocation(line: 13, column: 12, scope: !23, inlinedAt: !29)
!39 = !DILocation(line: 18, column: 8, scope: !11)
!40 = !DILocation(line: 19, column: 3, scope: !11)
!41 = !DISubprogram(name: "ext1", linkageName: "_Z4ext1i", scope: !3, file: !3, line: 2, type: !12, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !4)
!42 = !DISubprogram(name: "ext2", linkageName: "_Z4ext2i", scope: !3, file: !3, line: 3, type: !12, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !4)
...
---
name: _Z3funi
body: |
bb.0.entry:
successors: %bb.1(0x50000000), %bb.2(0x30000000)
liveins: $edi, $rbx
DBG_VALUE $edi, $noreg, !15, !DIExpression(), debug-location !16
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 16
CFI_INSTRUCTION offset $rbx, -16
$ebx = MOV32rr $edi
DBG_VALUE $ebx, $noreg, !15, !DIExpression(), debug-location !16
MOV32mr $rip, 1, $noreg, @glob, $noreg, $edi, debug-location !17 :: (store 4 into @glob)
DBG_VALUE $ebx, $noreg, !27, !DIExpression(), debug-location !30
DBG_VALUE 0, $noreg, !28, !DIExpression(), debug-location !30
TEST32rr $edi, $edi, implicit-def $eflags, debug-location !31
JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !33
bb.1.if.then.i:
successors: %bb.3(0x80000000)
liveins: $ebx
DBG_VALUE $ebx, $noreg, !27, !DIExpression(), debug-location !30
DBG_VALUE $ebx, $noreg, !15, !DIExpression(), debug-location !16
DBG_VALUE 0, $noreg, !28, !DIExpression(), debug-location !30
$edi = MOV32rr $ebx, debug-location !34
CALL64pcrel32 @_Z4ext1i, csr_64, implicit $rsp, implicit $ssp, implicit $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !34
DBG_VALUE $eax, $noreg, !28, !DIExpression(), debug-location !30
JMP_1 %bb.3
bb.2.if.else.i:
successors: %bb.3(0x80000000)
liveins: $ebx
DBG_VALUE $ebx, $noreg, !27, !DIExpression(), debug-location !30
DBG_VALUE $ebx, $noreg, !15, !DIExpression(), debug-location !16
DBG_VALUE 0, $noreg, !28, !DIExpression(), debug-location !30
$edi = MOV32rr $ebx, debug-location !36
CALL64pcrel32 @_Z4ext2i, csr_64, implicit $rsp, implicit $ssp, implicit $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !36
DBG_VALUE $eax, $noreg, !28, !DIExpression(), debug-location !30
bb.3._ZL9inline_mev.exit:
liveins: $eax, $ebx
DBG_VALUE $ebx, $noreg, !27, !DIExpression(), debug-location !30
DBG_VALUE $ebx, $noreg, !15, !DIExpression(), debug-location !16
DBG_VALUE $eax, $noreg, !28, !DIExpression(), debug-location !30
DBG_VALUE $eax, $noreg, !28, !DIExpression(), debug-location !30
renamable $eax = nsw IMUL32rr killed renamable $eax, killed renamable $ebx, implicit-def dead $eflags, debug-location !38
MOV32mr $rip, 1, $noreg, @glob, $noreg, killed renamable $eax, debug-location !39 :: (store 4 into @glob)
$eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, debug-location !40
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !40
DBG_VALUE $edi, $noreg, !15, !DIExpression(DW_OP_LLVM_entry_value, 1), debug-location !16
CFI_INSTRUCTION def_cfa_offset 8, debug-location !40
RETQ $eax, debug-location !40
...
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