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Fix a memory bug: increment an iterator of a deleted machine instr.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48853 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-27 01:27:25 +00:00
parent 7c1483bc6f
commit 7a963fa8ee
2 changed files with 31 additions and 2 deletions
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9
lib/CodeGen/TwoAddressInstructionPass.cpp
View File

@ -200,7 +200,8 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
for (MachineFunction::iterator mbbi = MF.begin(), mbbe = MF.end();
mbbi != mbbe; ++mbbi) {
for (MachineBasicBlock::iterator mi = mbbi->begin(), me = mbbi->end();
mi != me; ++mi) {
mi != me; ) {
MachineBasicBlock::iterator nmi = next(mi);
const TargetInstrDesc &TID = mi->getDesc();
bool FirstTied = true;
@ -298,7 +299,10 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
// then one instruction.
Sunk = Sink3AddrInstruction(mbbi, New, regB, mi);
mbbi->erase(mi); // Nuke the old inst.
if (!Sunk) mi = New;
if (!Sunk) {
mi = New;
nmi = next(mi);
}
++NumConvertedTo3Addr;
// Done with this instruction.
break;
@ -337,6 +341,7 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
DOUT << "\t\trewrite to:\t"; DEBUG(mi->print(*cerr.stream(), &TM));
}
mi = nmi;
}
}

24
test/CodeGen/X86/2008-03-25-TwoAddrPassBug.ll Normal file
View File

@ -0,0 +1,24 @@
; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2
define void @t() {
entry:
%tmp455 = shufflevector <4 x float> zeroinitializer, <4 x float> undef, <4 x i32> < i32 1, i32 0, i32 3, i32 2 > ; <<4 x float>> [#uses=1]
%tmp457 = mul <4 x float> zeroinitializer, %tmp455 ; <<4 x float>> [#uses=2]
%tmp461 = shufflevector <4 x float> %tmp457, <4 x float> undef, <4 x i32> zeroinitializer ; <<4 x float>> [#uses=1]
%tmp465 = shufflevector <4 x float> %tmp457, <4 x float> undef, <4 x i32> < i32 1, i32 1, i32 1, i32 1 > ; <<4 x float>> [#uses=1]
%tmp466 = sub <4 x float> %tmp461, %tmp465 ; <<4 x float>> [#uses=1]
%tmp536 = shufflevector <4 x float> zeroinitializer, <4 x float> %tmp466, <4 x i32> < i32 0, i32 4, i32 1, i32 5 > ; <<4 x float>> [#uses=1]
%tmp542 = shufflevector <4 x float> %tmp536, <4 x float> zeroinitializer, <4 x i32> < i32 6, i32 7, i32 2, i32 3 > ; <<4 x float>> [#uses=1]
%tmp580 = bitcast <4 x float> %tmp542 to <4 x i32> ; <<4 x i32>> [#uses=1]
%tmp582 = and <4 x i32> %tmp580, zeroinitializer ; <<4 x i32>> [#uses=1]
%tmp591 = or <4 x i32> %tmp582, zeroinitializer ; <<4 x i32>> [#uses=1]
%tmp592 = bitcast <4 x i32> %tmp591 to <4 x float> ; <<4 x float>> [#uses=1]
%tmp609 = fdiv <4 x float> < float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00 >, %tmp592 ; <<4 x float>> [#uses=1]
%tmp652 = shufflevector <4 x float> %tmp609, <4 x float> undef, <4 x i32> < i32 3, i32 3, i32 3, i32 3 > ; <<4 x float>> [#uses=1]
%tmp662 = mul <4 x float> zeroinitializer, %tmp652 ; <<4 x float>> [#uses=1]
%tmp678 = shufflevector <4 x float> %tmp662, <4 x float> undef, <4 x i32> < i32 1, i32 1, i32 1, i32 1 > ; <<4 x float>> [#uses=1]
%tmp753 = mul <4 x float> zeroinitializer, %tmp678 ; <<4 x float>> [#uses=1]
%tmp754 = sub <4 x float> zeroinitializer, %tmp753 ; <<4 x float>> [#uses=1]
store <4 x float> %tmp754, <4 x float>* null, align 16
unreachable
}