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Fix a crash in the pre-alloc splitter exposed by recent codegen changes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65121 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-02-20 10:02:23 +00:00
parent 3b2c01723c
commit 4cafbb58e2
2 changed files with 77 additions and 0 deletions
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6
lib/CodeGen/PreAllocSplitting.cpp
View File

@ -224,6 +224,9 @@ PreAllocSplitting::findSpillPoint(MachineBasicBlock *MBB, MachineInstr *MI,
if (RefsInMBB.empty() && !DefMI) {
MachineBasicBlock::iterator MII = MBB->begin();
MachineBasicBlock::iterator EndPt = MI;
if (MII == EndPt) return Pt;
do {
++MII;
unsigned Index = LIs->getInstructionIndex(MII);
@ -303,6 +306,9 @@ PreAllocSplitting::findRestorePoint(MachineBasicBlock *MBB, MachineInstr *MI,
if (RefsInMBB.empty() && LastIdx >= EndIdx) {
MachineBasicBlock::iterator MII = MBB->getFirstTerminator();
MachineBasicBlock::iterator EndPt = MI;
if (MII == EndPt) return Pt;
--MII;
do {
unsigned Index = LIs->getInstructionIndex(MII);

71
test/CodeGen/X86/2009-02-20-PreAllocSplit-Crash.ll Normal file
View File

@ -0,0 +1,71 @@
; RUN: llvm-as < %s | llc -march=x86 -mtriple=i386-apple-darwin8 -pre-alloc-split
define i32 @main() nounwind {
bb4.i.thread:
br label %bb5.i4
bb16: ; preds = %bb111.i
%phitmp = add i32 %indvar.reg2mem.4, 1 ; <i32> [#uses=2]
switch i32 %indvar.reg2mem.4, label %bb100.i [
i32 0, label %bb5.i4
i32 1, label %bb5.i4
i32 2, label %bb5.i4
i32 5, label %bb.i14.i
i32 6, label %bb.i14.i
i32 7, label %bb.i14.i
]
bb5.i4: ; preds = %bb16, %bb16, %bb16, %bb4.i.thread
br i1 false, label %bb102.i, label %bb103.i
bb.i14.i: ; preds = %bb16, %bb16, %bb16
%0 = malloc [600 x i32] ; <[600 x i32]*> [#uses=0]
%1 = icmp eq i32 %phitmp, 7 ; <i1> [#uses=1]
%tl.0.i = select i1 %1, float 1.000000e+02, float 1.000000e+00 ; <float> [#uses=1]
%2 = icmp eq i32 %phitmp, 8 ; <i1> [#uses=1]
%tu.0.i = select i1 %2, float 1.000000e+02, float 1.000000e+00 ; <float> [#uses=1]
br label %bb30.i
bb30.i: ; preds = %bb36.i, %bb.i14.i
%i.1173.i = phi i32 [ 0, %bb.i14.i ], [ %indvar.next240.i, %bb36.i ] ; <i32> [#uses=3]
%3 = icmp eq i32 0, %i.1173.i ; <i1> [#uses=1]
br i1 %3, label %bb33.i, label %bb34.i
bb33.i: ; preds = %bb30.i
store float %tl.0.i, float* null, align 4
br label %bb36.i
bb34.i: ; preds = %bb30.i
%4 = icmp eq i32 0, %i.1173.i ; <i1> [#uses=1]
br i1 %4, label %bb35.i, label %bb36.i
bb35.i: ; preds = %bb34.i
store float %tu.0.i, float* null, align 4
br label %bb36.i
bb36.i: ; preds = %bb35.i, %bb34.i, %bb33.i
%indvar.next240.i = add i32 %i.1173.i, 1 ; <i32> [#uses=1]
br label %bb30.i
bb100.i: ; preds = %bb16
ret i32 0
bb102.i: ; preds = %bb5.i4
br label %bb103.i
bb103.i: ; preds = %bb102.i, %bb5.i4
%indvar.reg2mem.4 = phi i32 [ 0, %bb5.i4 ], [ 0, %bb102.i ] ; <i32> [#uses=2]
%n.0.reg2mem.1.i = phi i32 [ 0, %bb102.i ], [ 0, %bb5.i4 ] ; <i32> [#uses=1]
%5 = icmp eq i32 0, 0 ; <i1> [#uses=1]
br i1 %5, label %bb111.i, label %bb108.i
bb108.i: ; preds = %bb103.i
ret i32 0
bb111.i: ; preds = %bb103.i
%6 = icmp sgt i32 %n.0.reg2mem.1.i, 7 ; <i1> [#uses=1]
br i1 %6, label %bb16, label %bb112.i
bb112.i: ; preds = %bb111.i
unreachable
}