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[Utils] Salvage the debug info of DCE'ed 'sub' instructions

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This salvages 14 debug values in a stage2 build of clang.

llvm-svn: 324974
This commit is contained in:
Vedant Kumar 2018-02-13 01:09:47 +00:00
parent cda75a7d36
commit 2847f38775
2 changed files with 23 additions and 0 deletions
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3
lib/Transforms/Utils/Local.cpp
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@ -1546,6 +1546,9 @@ void llvm::salvageDebugInfo(Instruction &I) {
case Instruction::Add:
applyOffset(DII, Val);
break;
case Instruction::Sub:
applyOffset(DII, -int64_t(Val));
break;
case Instruction::Or:
applyOps(DII, {dwarf::DW_OP_constu, Val, dwarf::DW_OP_or});
break;

20
test/Transforms/InstCombine/debuginfo-variables.ll
View File

@ -24,6 +24,20 @@ define void @test_xor(i32 %A) {
ret void
}
define void @test_sub_neg(i64 %A) {
; CHECK-LABEL: @test_sub_neg(
; CHECK-NEXT: call void @llvm.dbg.value(metadata i64 %A, metadata !27, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !28
%1 = sub i64 %A, -1
ret void
}
define void @test_sub_pos(i64 %A) {
; CHECK-LABEL: @test_sub_pos(
; CHECK-NEXT: call void @llvm.dbg.value(metadata i64 %A, metadata !32, metadata !DIExpression(DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value)), !dbg !33
%1 = sub i64 %A, 1
ret void
}
; CHECK: !8 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 1, type: !9)
; CHECK: !10 = !DILocalVariable(name: "2", scope: !5, file: !1, line: 2, type: !11)
; CHECK: !12 = !DILocation(line: 2, column: 1, scope: !5)
@ -34,3 +48,9 @@ define void @test_xor(i32 %A) {
; CHECK: !22 = !DILocalVariable(name: "4", scope: !20, file: !1, line: 6, type: !9)
; CHECK: !23 = !DILocation(line: 6, column: 1, scope: !20)
; CHECK: !27 = !DILocalVariable(name: "5", scope: !25, file: !1, line: 8, type: !11)
; CHECK: !28 = !DILocation(line: 8, column: 1, scope: !25)
; CHECK: !32 = !DILocalVariable(name: "6", scope: !30, file: !1, line: 10, type: !11)
; CHECK: !33 = !DILocation(line: 10, column: 1, scope: !30)