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Fix a bug in dead spill slot elimination. 

llvm-svn: 47687
This commit is contained in:
Evan Cheng 2008-02-27 19:57:11 +00:00
parent e5e32ec8f7
commit fdc732ab9a
3 changed files with 72 additions and 0 deletions
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4
llvm/include/llvm/CodeGen/MachineFrameInfo.h
View File

@ -216,6 +216,8 @@ public:
int64_t getObjectOffset(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
assert(!isDeadObjectIndex(ObjectIdx) &&
"Getting frame offset for a dead object?");
return Objects[ObjectIdx+NumFixedObjects].SPOffset;
}
@ -225,6 +227,8 @@ public:
void setObjectOffset(int ObjectIdx, int64_t SPOffset) {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
assert(!isDeadObjectIndex(ObjectIdx) &&
"Setting frame offset for a dead object?");
Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset;
}

2
llvm/lib/CodeGen/VirtRegMap.cpp
View File

@ -914,6 +914,7 @@ bool LocalSpiller::PrepForUnfoldOpti(MachineBasicBlock &MBB,
Ops.push_back(Idx);
MachineInstr *FoldedMI = TII->foldMemoryOperand(MF, NewMI, Ops, SS);
if (FoldedMI) {
VRM.addSpillSlotUse(SS, FoldedMI);
if (!VRM.hasPhys(UnfoldVR))
VRM.assignVirt2Phys(UnfoldVR, UnfoldPR);
VRM.virtFolded(VirtReg, FoldedMI, VirtRegMap::isRef);
@ -1414,6 +1415,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
MBB.insert(MII, NewMIs[0]);
NewStore = NewMIs[1];
MBB.insert(MII, NewStore);
VRM.addSpillSlotUse(SS, NewStore);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;

66
llvm/test/CodeGen/X86/2008-02-27-DeadSlotElimBug.ll Normal file
View File

@ -0,0 +1,66 @@
; RUN: llvm-as < %s | llc -march=x86
%struct.CompAtom = type <{ %struct.Position, float, i32 }>
%struct.Lattice = type { %struct.Position, %struct.Position, %struct.Position, %struct.Position, %struct.Position, %struct.Position, %struct.Position, i32, i32, i32 }
%struct.Position = type { double, double, double }
define fastcc %struct.CompAtom* @_ZNK7Lattice6createEP8CompAtomii(%struct.Lattice* %this, %struct.CompAtom* %d, i32 %n, i32 %i) {
entry:
%tmp18 = tail call i8* @_Znam( i32 0 ) ; <i8*> [#uses=1]
%tmp1819 = bitcast i8* %tmp18 to %struct.CompAtom* ; <%struct.CompAtom*> [#uses=4]
%tmp3286 = icmp eq i32 %n, 0 ; <i1> [#uses=1]
br i1 %tmp3286, label %bb35, label %bb24
bb24: ; preds = %bb24, %entry
%tmp9.0.reg2mem.0.rec = phi i32 [ %indvar.next, %bb24 ], [ 0, %entry ] ; <i32> [#uses=3]
%tmp3.i.i = getelementptr %struct.CompAtom* %tmp1819, i32 %tmp9.0.reg2mem.0.rec, i32 0, i32 1 ; <double*> [#uses=0]
%tmp5.i.i = getelementptr %struct.CompAtom* %tmp1819, i32 %tmp9.0.reg2mem.0.rec, i32 0, i32 2 ; <double*> [#uses=1]
store double -9.999900e+04, double* %tmp5.i.i, align 4
%indvar.next = add i32 %tmp9.0.reg2mem.0.rec, 1 ; <i32> [#uses=2]
%exitcond = icmp eq i32 %indvar.next, %n ; <i1> [#uses=1]
br i1 %exitcond, label %bb35, label %bb24
bb35: ; preds = %bb24, %entry
%tmp42 = sdiv i32 %i, 9 ; <i32> [#uses=1]
%tmp43 = add i32 %tmp42, -1 ; <i32> [#uses=1]
%tmp4344 = sitofp i32 %tmp43 to double ; <double> [#uses=1]
%tmp17.i76 = mul double %tmp4344, 0.000000e+00 ; <double> [#uses=1]
%tmp48 = sdiv i32 %i, 3 ; <i32> [#uses=1]
%tmp49 = srem i32 %tmp48, 3 ; <i32> [#uses=1]
%tmp50 = add i32 %tmp49, -1 ; <i32> [#uses=1]
%tmp5051 = sitofp i32 %tmp50 to double ; <double> [#uses=1]
%tmp17.i63 = mul double %tmp5051, 0.000000e+00 ; <double> [#uses=1]
%tmp55 = srem i32 %i, 3 ; <i32> [#uses=1]
%tmp56 = add i32 %tmp55, -1 ; <i32> [#uses=1]
%tmp5657 = sitofp i32 %tmp56 to double ; <double> [#uses=1]
%tmp15.i49 = getelementptr %struct.Lattice* %this, i32 0, i32 0, i32 0 ; <double*> [#uses=1]
%tmp16.i50 = load double* %tmp15.i49, align 4 ; <double> [#uses=1]
%tmp17.i = mul double %tmp5657, %tmp16.i50 ; <double> [#uses=1]
%tmp20.i39 = add double %tmp17.i, %tmp17.i63 ; <double> [#uses=1]
%tmp20.i23 = add double %tmp20.i39, %tmp17.i76 ; <double> [#uses=1]
br i1 false, label %bb58.preheader, label %bb81
bb58.preheader: ; preds = %bb35
%smax = select i1 false, i32 1, i32 %n ; <i32> [#uses=1]
br label %bb58
bb58: ; preds = %bb58, %bb58.preheader
%tmp20.i7 = getelementptr %struct.CompAtom* %d, i32 0, i32 2 ; <i32*> [#uses=2]
%tmp25.i = getelementptr %struct.CompAtom* %tmp1819, i32 0, i32 2 ; <i32*> [#uses=2]
%tmp74.i = load i32* %tmp20.i7, align 1 ; <i32> [#uses=1]
%tmp82.i = and i32 %tmp74.i, 134217728 ; <i32> [#uses=1]
%tmp85.i = or i32 0, %tmp82.i ; <i32> [#uses=1]
store i32 %tmp85.i, i32* %tmp25.i, align 1
%tmp88.i = load i32* %tmp20.i7, align 1 ; <i32> [#uses=1]
%tmp95.i = and i32 %tmp88.i, -268435456 ; <i32> [#uses=1]
%tmp97.i = or i32 0, %tmp95.i ; <i32> [#uses=1]
store i32 %tmp97.i, i32* %tmp25.i, align 1
%tmp6.i = add double 0.000000e+00, %tmp20.i23 ; <double> [#uses=0]
%exitcond96 = icmp eq i32 0, %smax ; <i1> [#uses=1]
br i1 %exitcond96, label %bb81, label %bb58
bb81: ; preds = %bb58, %bb35
ret %struct.CompAtom* %tmp1819
}
declare i8* @_Znam(i32)