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Fix what is _hopefully_ the last corner case for loops.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40503 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-25 23:54:42 +00:00
parent a49ed78c27
commit febc7e3613
2 changed files with 92 additions and 2 deletions
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8
lib/Transforms/Scalar/GVN.cpp
View File

@ -738,8 +738,12 @@ Value *GVN::performPHIConstruction(BasicBlock *BB, LoadInst* orig,
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
if (!visited.count(*PI))
PN->addIncoming(performPHIConstruction(*PI, orig, Phis, visited), *PI);
else
PN->addIncoming(Phis[*PI], *PI);
else {
if (Phis[*PI])
PN->addIncoming(Phis[*PI], *PI);
else
PN->addIncoming(PN, *PI);
}
visited.erase(BB);
bool all_same = PN->getNumIncomingValues() != 1;

86
test/Transforms/GVN/2007-07-25-DominatedLoop.ll Normal file
View File

@ -0,0 +1,86 @@
; RUN: llvm-as < %s | opt -gvn | llvm-dis
%struct.PerlInterpreter = type { i8 }
@PL_sv_count = external global i32 ; <i32*> [#uses=2]
define void @perl_destruct(%struct.PerlInterpreter* %sv_interp) {
entry:
br i1 false, label %cond_next25, label %cond_true16
cond_true16: ; preds = %entry
ret void
cond_next25: ; preds = %entry
br i1 false, label %cond_next33, label %cond_true32
cond_true32: ; preds = %cond_next25
ret void
cond_next33: ; preds = %cond_next25
br i1 false, label %cond_next61, label %cond_true.i46
cond_true.i46: ; preds = %cond_next33
ret void
cond_next61: ; preds = %cond_next33
br i1 false, label %cond_next69, label %cond_true66
cond_true66: ; preds = %cond_next61
ret void
cond_next69: ; preds = %cond_next61
br i1 false, label %Perl_safefree.exit52, label %cond_true.i50
cond_true.i50: ; preds = %cond_next69
ret void
Perl_safefree.exit52: ; preds = %cond_next69
br i1 false, label %cond_next80, label %cond_true77
cond_true77: ; preds = %Perl_safefree.exit52
ret void
cond_next80: ; preds = %Perl_safefree.exit52
br i1 false, label %Perl_safefree.exit56, label %cond_true.i54
cond_true.i54: ; preds = %cond_next80
ret void
Perl_safefree.exit56: ; preds = %cond_next80
br i1 false, label %Perl_safefree.exit60, label %cond_true.i58
cond_true.i58: ; preds = %Perl_safefree.exit56
ret void
Perl_safefree.exit60: ; preds = %Perl_safefree.exit56
br i1 false, label %Perl_safefree.exit64, label %cond_true.i62
cond_true.i62: ; preds = %Perl_safefree.exit60
ret void
Perl_safefree.exit64: ; preds = %Perl_safefree.exit60
br i1 false, label %Perl_safefree.exit68, label %cond_true.i66
cond_true.i66: ; preds = %Perl_safefree.exit64
ret void
Perl_safefree.exit68: ; preds = %Perl_safefree.exit64
br i1 false, label %cond_next150, label %cond_true23.i
cond_true23.i: ; preds = %Perl_safefree.exit68
ret void
cond_next150: ; preds = %Perl_safefree.exit68
%tmp16092 = load i32* @PL_sv_count, align 4 ; <i32> [#uses=0]
br label %cond_next165
bb157: ; preds = %cond_next165
%tmp158 = load i32* @PL_sv_count, align 4 ; <i32> [#uses=0]
br label %cond_next165
cond_next165: ; preds = %bb157, %cond_next150
br i1 false, label %bb171, label %bb157
bb171: ; preds = %cond_next165
ret void
}