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While hoisting common code from if/else, hoist debug info intrinsics if they match.

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llvm-svn: 129078
This commit is contained in:
Devang Patel 2011-04-07 17:27:36 +00:00
parent 3deb96fad7
commit 17670a995c
2 changed files with 71 additions and 8 deletions
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26
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -807,10 +807,15 @@ static bool HoistThenElseCodeToIf(BranchInst *BI) {
BasicBlock::iterator BB2_Itr = BB2->begin();
Instruction *I1 = BB1_Itr++, *I2 = BB2_Itr++;
while (isa<DbgInfoIntrinsic>(I1))
I1 = BB1_Itr++;
while (isa<DbgInfoIntrinsic>(I2))
I2 = BB2_Itr++;
// Skip debug info if it is not identical.
DbgInfoIntrinsic *DBI1 = dyn_cast<DbgInfoIntrinsic>(I1);
DbgInfoIntrinsic *DBI2 = dyn_cast<DbgInfoIntrinsic>(I2);
if (!DBI1 || !DBI2 || !DBI1->isIdenticalToWhenDefined(DBI2)) {
while (isa<DbgInfoIntrinsic>(I1))
I1 = BB1_Itr++;
while (isa<DbgInfoIntrinsic>(I2))
I2 = BB2_Itr++;
}
if (isa<PHINode>(I1) || !I1->isIdenticalToWhenDefined(I2) ||
(isa<InvokeInst>(I1) && !isSafeToHoistInvoke(BB1, BB2, I1, I2)))
return false;
@ -834,11 +839,16 @@ static bool HoistThenElseCodeToIf(BranchInst *BI) {
I2->eraseFromParent();
I1 = BB1_Itr++;
while (isa<DbgInfoIntrinsic>(I1))
I1 = BB1_Itr++;
I2 = BB2_Itr++;
while (isa<DbgInfoIntrinsic>(I2))
I2 = BB2_Itr++;
// Skip debug info if it is not identical.
DbgInfoIntrinsic *DBI1 = dyn_cast<DbgInfoIntrinsic>(I1);
DbgInfoIntrinsic *DBI2 = dyn_cast<DbgInfoIntrinsic>(I2);
if (!DBI1 || !DBI2 || !DBI1->isIdenticalToWhenDefined(DBI2)) {
while (isa<DbgInfoIntrinsic>(I1))
I1 = BB1_Itr++;
while (isa<DbgInfoIntrinsic>(I2))
I2 = BB2_Itr++;
}
} while (I1->isIdenticalToWhenDefined(I2));
return true;

53
test/Transforms/SimplifyCFG/hoist-dbgvalue.ll Normal file
View File

@ -0,0 +1,53 @@
; RUN: opt -simplifycfg -S < %s | FileCheck %s
define i32 @foo(i32 %i) nounwind ssp {
call void @llvm.dbg.value(metadata !{i32 %i}, i64 0, metadata !6), !dbg !7
call void @llvm.dbg.value(metadata !8, i64 0, metadata !9), !dbg !11
%1 = icmp ne i32 %i, 0, !dbg !12
;CHECK: call i32 (...)* @bar()
;CHECK-NEXT: llvm.dbg.value
br i1 %1, label %2, label %4, !dbg !12
; <label>:2 ; preds = %0
%3 = call i32 (...)* @bar(), !dbg !13
call void @llvm.dbg.value(metadata !{i32 %3}, i64 0, metadata !9), !dbg !13
br label %6, !dbg !15
; <label>:4 ; preds = %0
%5 = call i32 (...)* @bar(), !dbg !16
call void @llvm.dbg.value(metadata !{i32 %5}, i64 0, metadata !9), !dbg !16
br label %6, !dbg !18
; <label>:6 ; preds = %4, %2
%k.0 = phi i32 [ %3, %2 ], [ %5, %4 ]
ret i32 %k.0, !dbg !19
}
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare i32 @bar(...)
declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
!llvm.dbg.sp = !{!0}
!0 = metadata !{i32 589870, i32 0, metadata !1, metadata !"foo", metadata !"foo", metadata !"", metadata !1, i32 2, metadata !3, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 false, i32 (i32)* @foo} ; [ DW_TAG_subprogram ]
!1 = metadata !{i32 589865, metadata !"b.c", metadata !"/private/tmp", metadata !2} ; [ DW_TAG_file_type ]
!2 = metadata !{i32 589841, i32 0, i32 12, metadata !"b.c", metadata !"/private/tmp", metadata !"clang", i1 true, i1 false, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
!3 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !4, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
!4 = metadata !{metadata !5}
!5 = metadata !{i32 589860, metadata !2, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
!6 = metadata !{i32 590081, metadata !0, metadata !"i", metadata !1, i32 16777218, metadata !5, i32 0} ; [ DW_TAG_arg_variable ]
!7 = metadata !{i32 2, i32 13, metadata !0, null}
!8 = metadata !{i32 0}
!9 = metadata !{i32 590080, metadata !10, metadata !"k", metadata !1, i32 3, metadata !5, i32 0} ; [ DW_TAG_auto_variable ]
!10 = metadata !{i32 589835, metadata !0, i32 2, i32 16, metadata !1, i32 0} ; [ DW_TAG_lexical_block ]
!11 = metadata !{i32 3, i32 12, metadata !10, null}
!12 = metadata !{i32 4, i32 3, metadata !10, null}
!13 = metadata !{i32 5, i32 5, metadata !14, null}
!14 = metadata !{i32 589835, metadata !10, i32 4, i32 10, metadata !1, i32 1} ; [ DW_TAG_lexical_block ]
!15 = metadata !{i32 6, i32 3, metadata !14, null}
!16 = metadata !{i32 7, i32 5, metadata !17, null}
!17 = metadata !{i32 589835, metadata !10, i32 6, i32 10, metadata !1, i32 2} ; [ DW_TAG_lexical_block ]
!18 = metadata !{i32 8, i32 3, metadata !17, null}
!19 = metadata !{i32 9, i32 3, metadata !10, null}