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Avoid dereferencing a NULL pointer.

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Fixes PR13943.

llvm-svn: 164778
This commit is contained in:
Jakob Stoklund Olesen 2012-09-27 16:34:19 +00:00
parent 466ac299d9
commit ffe0e379b9
2 changed files with 36 additions and 1 deletions
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2
lib/CodeGen/LiveRangeEdit.cpp
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@ -87,7 +87,7 @@ bool LiveRangeEdit::allUsesAvailableAt(const MachineInstr *OrigMI,
// We can't remat physreg uses, unless it is a constant.
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) {
if (MRI.isConstantPhysReg(MO.getReg(), VRM->getMachineFunction()))
if (MRI.isConstantPhysReg(MO.getReg(), *OrigMI->getParent()->getParent()))
continue;
return false;
}

35
test/CodeGen/X86/crash.ll
View File

@ -442,3 +442,38 @@ entry:
ret void
}
declare void @_Z6PrintFz(...)
@a = external global i32, align 4
@fn1.g = private unnamed_addr constant [9 x i32*] [i32* null, i32* @a, i32* null, i32* null, i32* null, i32* null, i32* null, i32* null, i32* null], align 16
@e = external global i32, align 4
define void @pr13943() nounwind uwtable ssp {
entry:
%srcval = load i576* bitcast ([9 x i32*]* @fn1.g to i576*), align 16
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%g.0 = phi i576 [ %srcval, %entry ], [ %ins, %for.inc ]
%0 = load i32* @e, align 4
%1 = lshr i576 %g.0, 64
%2 = trunc i576 %1 to i64
%3 = inttoptr i64 %2 to i32*
%cmp = icmp eq i32* undef, %3
%conv2 = zext i1 %cmp to i32
%and = and i32 %conv2, %0
tail call void (...)* @fn3(i32 %and) nounwind
%tobool = icmp eq i32 undef, 0
br i1 %tobool, label %for.inc, label %if.then
if.then: ; preds = %for.cond
ret void
for.inc: ; preds = %for.cond
%4 = shl i576 %1, 384
%mask = and i576 %g.0, -726838724295606890509921801691610055141362320587174446476410459910173841445449629921945328942266354949348255351381262292727973638307841
%5 = and i576 %4, 726838724295606890509921801691610055141362320587174446476410459910173841445449629921945328942266354949348255351381262292727973638307840
%ins = or i576 %5, %mask
br label %for.cond
}
declare void @fn3(...)