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Avoid creating bad PHI instructions when BR is being const-folded.

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llvm-svn: 97836
This commit is contained in:
Jakob Stoklund Olesen 2010-03-05 21:49:10 +00:00
parent 5c83d9b9b8
commit 67476519d7
2 changed files with 44 additions and 0 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -1038,6 +1038,8 @@ SelectionDAGISel::FinishBasicBlock() {
MachineInstr *PHI = SDB->PHINodesToUpdate[i].first;
assert(PHI->isPHI() &&
"This is not a machine PHI node that we are updating!");
if (!BB->isSuccessor(PHI->getParent()))
continue;
PHI->addOperand(MachineOperand::CreateReg(SDB->PHINodesToUpdate[i].second,
false));
PHI->addOperand(MachineOperand::CreateMBB(BB));

42
test/CodeGen/X86/2010-03-05-ConstantFoldCFG.ll Normal file
View File

@ -0,0 +1,42 @@
; RUN: llc < %s -verify-machineinstrs
;
; When BRCOND is constant-folded to BR, make sure that PHI nodes don't get
; spurious operands when the CFG is trimmed.
;
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.2"
define fastcc void @_ZSt16__introsort_loopIPdl17less_than_functorEvT_S2_T0_T1_(double* %__first, double* %__last, i64 %__depth_limit) nounwind ssp {
entry:
br i1 undef, label %bb1, label %bb2
bb1: ; preds = %entry
ret void
bb2: ; preds = %entry
br label %bb2.outer.i
bb2.outer.i: ; preds = %bb9.i, %bb2
br i1 undef, label %bb1.i, label %bb5.preheader.i
bb1.i: ; preds = %bb1.i, %bb2.outer.i
%indvar5.i = phi i64 [ %tmp, %bb1.i ], [ 0, %bb2.outer.i ] ; <i64> [#uses=1]
%tmp = add i64 %indvar5.i, 1 ; <i64> [#uses=2]
%scevgep.i = getelementptr double* undef, i64 %tmp ; <double*> [#uses=0]
br i1 undef, label %bb1.i, label %bb5.preheader.i
bb5.preheader.i: ; preds = %bb1.i, %bb2.outer.i
br label %bb5.i
bb5.i: ; preds = %bb5.i, %bb5.preheader.i
br i1 undef, label %bb5.i, label %bb7.i6
bb7.i6: ; preds = %bb5.i
br i1 undef, label %bb9.i, label %_ZSt21__unguarded_partitionIPdd17less_than_functorET_S2_S2_T0_T1_.exit
bb9.i: ; preds = %bb7.i6
br label %bb2.outer.i
_ZSt21__unguarded_partitionIPdd17less_than_functorET_S2_S2_T0_T1_.exit: ; preds = %bb7.i6
unreachable
}