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Do not add discriminator encoding for debug intrinsics.

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Summary: There are certain requirements for debug location of debug intrinsics, e.g. the scope of the DILocalVariable should be the same as the scope of its debug location. As a result, we should not add discriminator encoding for debug intrinsics.

Reviewers: dblaikie, aprantl

Reviewed By: aprantl

Subscribers: JDevlieghere, aprantl, bjope, sanjoy, llvm-commits

Differential Revision: https://reviews.llvm.org/D39343

llvm-svn: 316703
This commit is contained in:
Dehao Chen 2017-10-26 21:20:52 +00:00
parent fbc5f2a744
commit 91af01a4b7
3 changed files with 15 additions and 7 deletions
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1
lib/Transforms/Utils/LoopUnroll.cpp
View File

@ -544,6 +544,7 @@ LoopUnrollResult llvm::UnrollLoop(
if (Header->getParent()->isDebugInfoForProfiling())
for (BasicBlock *BB : L->getBlocks())
for (Instruction &I : *BB)
if (!isa<DbgInfoIntrinsic>(&I))
if (const DILocation *DIL = I.getDebugLoc())
I.setDebugLoc(DIL->cloneWithDuplicationFactor(Count));

3
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@ -803,7 +803,8 @@ static Instruction *getDebugLocFromInstOrOperands(Instruction *I) {
void InnerLoopVectorizer::setDebugLocFromInst(IRBuilder<> &B, const Value *Ptr) {
if (const Instruction *Inst = dyn_cast_or_null<Instruction>(Ptr)) {
const DILocation *DIL = Inst->getDebugLoc();
if (DIL && Inst->getFunction()->isDebugInfoForProfiling())
if (DIL && Inst->getFunction()->isDebugInfoForProfiling() &&
!isa<DbgInfoIntrinsic>(Inst))
B.SetCurrentDebugLocation(DIL->cloneWithDuplicationFactor(UF * VF));
else
B.SetCurrentDebugLocation(DIL);

14
test/Transforms/LoopVectorize/discriminator.ll
View File

@ -1,7 +1,7 @@
; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %s | FileCheck --check-prefix=LOOPVEC_4_1 %s
; RUN: opt -S -loop-vectorize -force-vector-width=2 -force-vector-interleave=3 < %s | FileCheck --check-prefix=LOOPVEC_2_3 %s
; RUN: opt -S -loop-unroll -unroll-count=5 < %s | FileCheck --check-prefix=LOOPUNROLL_5 %s
; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=4 -loop-unroll -unroll-count=2 < %s | FileCheck --check-prefix=LOOPVEC_UNROLL %s
; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %s | FileCheck --check-prefix=DBG_VALUE --check-prefix=LOOPVEC_4_1 %s
; RUN: opt -S -loop-vectorize -force-vector-width=2 -force-vector-interleave=3 < %s | FileCheck --check-prefix=DBG_VALUE --check-prefix=LOOPVEC_2_3 %s
; RUN: opt -S -loop-unroll -unroll-count=5 < %s | FileCheck --check-prefix=DBG_VALUE --check-prefix=LOOPUNROLL_5 %s
; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=4 -loop-unroll -unroll-count=2 < %s | FileCheck --check-prefix=DBG_VALUE --check-prefix=LOOPVEC_UNROLL %s
; Test if vectorization/unroll factor is recorded in discriminator.
;
@ -16,6 +16,7 @@
@a = local_unnamed_addr global i32* null, align 8
@b = local_unnamed_addr global i32* null, align 8
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
%1 = load i32*, i32** @b, align 8, !dbg !8, !tbaa !9
@ -29,6 +30,8 @@ define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
%6 = getelementptr inbounds i32, i32* %2, i64 %indvars.iv, !dbg !13
%7 = load i32, i32* %6, align 4, !dbg !17, !tbaa !15
%8 = add nsw i32 %7, %5, !dbg !17
;DBG_VALUE: call void @llvm.dbg.declare{{.*}}!dbg ![[DBG:[0-9]*]]
call void @llvm.dbg.declare(metadata i32 %8, metadata !22, metadata !DIExpression()), !dbg !17
store i32 %8, i32* %6, align 4, !dbg !17, !tbaa !15
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !18
%exitcond = icmp eq i64 %indvars.iv.next, 4096, !dbg !19
@ -38,6 +41,7 @@ define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
ret void, !dbg !21
}
;DBG_VALUE: ![[TOP:[0-9]*]] = distinct !DISubprogram(name: "foo"
;LOOPVEC_4_1: discriminator: 17
;LOOPVEC_2_3: discriminator: 25
;LOOPUNROLL_5: discriminator: 21
@ -45,6 +49,7 @@ define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
; are unrolled.
;LOOPVEC_UNROLL: discriminator: 385
;LOOPVEC_UNROLL: discriminator: 9
;DBG_VALUE: ![[DBG]] = {{.*}}, scope: ![[TOP]]
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
@ -68,3 +73,4 @@ define void @_Z3foov() local_unnamed_addr #0 !dbg !6 {
!19 = !DILocation(line: 5, column: 21, scope: !6)
!20 = distinct !{!20, !14}
!21 = !DILocation(line: 7, column: 1, scope: !6)
!22 = !DILocalVariable(name: "a", arg: 1, scope: !6, file: !1, line: 10)