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[LoopSimplify] Set proper debug location in loop backedge blocks.

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Set debug location for terminator instruction in loop backedge block
(which is an unconditional jump to loop header). We can't copy debug
location from original backedges, as there can be several of them,
with different debug info locations. So, we follow the approach of
SplitBlockPredecessors, and copy the debug info from first non-PHI
instruction in the header (i.e. destination block).

This is yet another change for PR23837.

llvm-svn: 240999
This commit is contained in:
Alexey Samsonov 2015-06-29 21:30:14 +00:00
parent d6c4d72807
commit e322012e46
2 changed files with 29 additions and 12 deletions
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3
lib/Transforms/Utils/LoopSimplify.cpp
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@ -386,8 +386,9 @@ static BasicBlock *insertUniqueBackedgeBlock(Loop *L, BasicBlock *Preheader,
// Create and insert the new backedge block...
BasicBlock *BEBlock = BasicBlock::Create(Header->getContext(),
Header->getName()+".backedge", F);
Header->getName() + ".backedge", F);
BranchInst *BETerminator = BranchInst::Create(Header, BEBlock);
BETerminator->setDebugLoc(Header->getFirstNonPHI()->getDebugLoc());
DEBUG(dbgs() << "LoopSimplify: Inserting unique backedge block "
<< BEBlock->getName() << "\n");

38
test/Transforms/LoopSimplify/single-backedge.ll
View File

@ -5,19 +5,35 @@
; RUN: opt < %s -indvars -S | FileCheck %s
; CHECK: Loop.backedge:
; CHECK-NOT: br
; CHECK: br label %Loop
; CHECK: br label %Loop, !dbg [[BACKEDGE_LOC:![0-9]+]]
; CHECK: [[BACKEDGE_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}})
define i32 @test(i1 %C) {
; <label>:0
br label %Loop
Loop: ; preds = %BE2, %BE1, %0
%IV = phi i32 [ 1, %0 ], [ %IV2, %BE1 ], [ %IV2, %BE2 ] ; <i32> [#uses=2]
store i32 %IV, i32* null
%IV2 = add i32 %IV, 2 ; <i32> [#uses=2]
br i1 %C, label %BE1, label %BE2
BE1: ; preds = %Loop
br label %Loop
BE2: ; preds = %Loop
br label %Loop
br label %Loop, !dbg !6
Loop: ; preds = %BE2, %BE1, %0
%IV = phi i32 [ 1, %0 ], [ %IV2, %BE1 ], [ %IV2, %BE2 ] ; <i32> [#uses=2]
store i32 %IV, i32* null, !dbg !7
%IV2 = add i32 %IV, 2, !dbg !8 ; <i32> [#uses=2]
br i1 %C, label %BE1, label %BE2, !dbg !9
BE1: ; preds = %Loop
br label %Loop, !dbg !10
BE2: ; preds = %n br label %Loop
br label %Loop, !dbg !11
}
!llvm.module.flags = !{!0, !1}
!0 = !{i32 2, !"Dwarf Version", i32 4}
!1 = !{i32 2, !"Debug Info Version", i32 3}
!2 = !{}
!3 = !DISubroutineType(types: !2)
!4 = !DIFile(filename: "atomic.cpp", directory: "/tmp")
!5 = !DISubprogram(name: "test", scope: !4, file: !4, line: 99, type: !3, isLocal: false, isDefinition: true, scopeLine: 100, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!6 = !DILocation(line: 100, column: 1, scope: !5)
!7 = !DILocation(line: 101, column: 1, scope: !5)
!8 = !DILocation(line: 102, column: 1, scope: !5)
!9 = !DILocation(line: 103, column: 1, scope: !5)
!10 = !DILocation(line: 104, column: 1, scope: !5)
!11 = !DILocation(line: 105, column: 1, scope: !5)