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Correctly update dom-tree after loop vectorizer.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221009 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Zolotukhin 2014-10-31 22:28:03 +00:00
parent 021153f536
commit cf19403e39
2 changed files with 143 additions and 1 deletions
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2
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -3428,7 +3428,7 @@ void InnerLoopVectorizer::updateAnalysis() {
DT->addNewBlock(LoopMiddleBlock, LoopBypassBlocks[1]);
DT->addNewBlock(LoopScalarPreHeader, LoopBypassBlocks[0]);
DT->changeImmediateDominator(LoopScalarBody, LoopScalarPreHeader);
DT->changeImmediateDominator(LoopExitBlock, LoopMiddleBlock);
DT->changeImmediateDominator(LoopExitBlock, LoopBypassBlocks[0]);
DEBUG(DT->verifyDomTree());
}

142
test/Transforms/LoopVectorize/incorrect-dom-info.ll Normal file
View File

@ -0,0 +1,142 @@
; This test is based on one of benchmarks from SPEC2006. It exposes a bug with
; incorrect updating of the dom-tree.
; RUN: opt < %s -loop-vectorize -verify-dom-info
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
@PL_utf8skip = external constant [0 x i8]
; Function Attrs: nounwind ssp uwtable
define void @Perl_pp_quotemeta() #0 {
%len = alloca i64, align 8
br i1 undef, label %2, label %1
; <label>:1 ; preds = %0
br label %3
; <label>:2 ; preds = %0
br label %3
; <label>:3 ; preds = %2, %1
br i1 undef, label %34, label %4
; <label>:4 ; preds = %3
br i1 undef, label %5, label %6
; <label>:5 ; preds = %4
br label %6
; <label>:6 ; preds = %5, %4
br i1 undef, label %7, label %8
; <label>:7 ; preds = %6
br label %8
; <label>:8 ; preds = %7, %6
br i1 undef, label %.preheader, label %9
.preheader: ; preds = %9, %8
br i1 undef, label %.loopexit, label %.lr.ph
; <label>:9 ; preds = %8
br i1 undef, label %thread-pre-split.preheader, label %.preheader
thread-pre-split.preheader: ; preds = %9
br i1 undef, label %thread-pre-split._crit_edge, label %.lr.ph21
.thread-pre-split.loopexit_crit_edge: ; preds = %19
%scevgep.sum = xor i64 %umax, -1
%scevgep45 = getelementptr i8* %d.020, i64 %scevgep.sum
br label %thread-pre-split.loopexit
thread-pre-split.loopexit: ; preds = %11, %.thread-pre-split.loopexit_crit_edge
%d.1.lcssa = phi i8* [ %scevgep45, %.thread-pre-split.loopexit_crit_edge ], [ %d.020, %11 ]
br i1 false, label %thread-pre-split._crit_edge, label %.lr.ph21
.lr.ph21: ; preds = %26, %thread-pre-split.loopexit, %thread-pre-split.preheader
%d.020 = phi i8* [ undef, %26 ], [ %d.1.lcssa, %thread-pre-split.loopexit ], [ undef, %thread-pre-split.preheader ]
%10 = phi i64 [ %28, %26 ], [ undef, %thread-pre-split.loopexit ], [ undef, %thread-pre-split.preheader ]
br i1 undef, label %11, label %22
; <label>:11 ; preds = %.lr.ph21
%12 = getelementptr inbounds [0 x i8]* @PL_utf8skip, i64 0, i64 undef
%13 = load i8* %12, align 1
%14 = zext i8 %13 to i64
%15 = icmp ugt i64 %14, %10
%. = select i1 %15, i64 %10, i64 %14
br i1 undef, label %thread-pre-split.loopexit, label %.lr.ph28
.lr.ph28: ; preds = %11
%16 = xor i64 %10, -1
%17 = xor i64 %14, -1
%18 = icmp ugt i64 %16, %17
%umax = select i1 %18, i64 %16, i64 %17
br label %19
; <label>:19 ; preds = %19, %.lr.ph28
%ulen.126 = phi i64 [ %., %.lr.ph28 ], [ %20, %19 ]
%20 = add i64 %ulen.126, -1
%21 = icmp eq i64 %20, 0
br i1 %21, label %.thread-pre-split.loopexit_crit_edge, label %19
; <label>:22 ; preds = %.lr.ph21
br i1 undef, label %26, label %23
; <label>:23 ; preds = %22
br i1 undef, label %26, label %24
; <label>:24 ; preds = %23
br i1 undef, label %26, label %25
; <label>:25 ; preds = %24
br label %26
; <label>:26 ; preds = %25, %24, %23, %22
%27 = load i64* %len, align 8
%28 = add i64 %27, -1
br i1 undef, label %thread-pre-split._crit_edge, label %.lr.ph21
thread-pre-split._crit_edge: ; preds = %26, %thread-pre-split.loopexit, %thread-pre-split.preheader
br label %.loopexit
.lr.ph: ; preds = %33, %.preheader
br i1 undef, label %29, label %thread-pre-split5
; <label>:29 ; preds = %.lr.ph
br i1 undef, label %33, label %30
; <label>:30 ; preds = %29
br i1 undef, label %33, label %31
thread-pre-split5: ; preds = %.lr.ph
br i1 undef, label %33, label %31
; <label>:31 ; preds = %thread-pre-split5, %30
br i1 undef, label %33, label %32
; <label>:32 ; preds = %31
br label %33
; <label>:33 ; preds = %32, %31, %thread-pre-split5, %30, %29
br i1 undef, label %.loopexit, label %.lr.ph
.loopexit: ; preds = %33, %thread-pre-split._crit_edge, %.preheader
br label %35
; <label>:34 ; preds = %3
br label %35
; <label>:35 ; preds = %34, %.loopexit
br i1 undef, label %37, label %36
; <label>:36 ; preds = %35
br label %37
; <label>:37 ; preds = %36, %35
ret void
}
attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.ident = !{!0}
!0 = metadata !{metadata !"clang version 3.6.0 "}