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Special copy SUnit's do not have SDNode's.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45787 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-01-09 23:01:55 +00:00
parent ec1213fbbb
commit 19107563af
2 changed files with 34 additions and 2 deletions
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4
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
View File

@ -1208,13 +1208,13 @@ static unsigned calcMaxScratches(const SUnit *SU) {
for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
if (I->isCtrl) continue; // ignore chain preds
if (I->Dep->Node->getOpcode() != ISD::CopyFromReg)
if (!I->Dep->Node || I->Dep->Node->getOpcode() != ISD::CopyFromReg)
Scratches++;
}
for (SUnit::const_succ_iterator I = SU->Succs.begin(), E = SU->Succs.end();
I != E; ++I) {
if (I->isCtrl) continue; // ignore chain succs
if (I->Dep->Node->getOpcode() != ISD::CopyToReg)
if (!I->Dep->Node || I->Dep->Node->getOpcode() != ISD::CopyToReg)
Scratches += 10;
}
return Scratches;

32
test/CodeGen/X86/2008-01-08-SchedulerCrash.ll Normal file
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@ -0,0 +1,32 @@
; RUN: llvm-as < %s | llc -march=x86
%struct.indexentry = type { i32, i8*, i8*, i8*, i8*, i8* }
define i32 @_bfd_stab_section_find_nearest_line(i32 %offset) nounwind {
entry:
%tmp910 = add i32 0, %offset ; <i32> [#uses=1]
br i1 true, label %bb951, label %bb917
bb917: ; preds = %entry
ret i32 0
bb951: ; preds = %bb986, %entry
%tmp955 = sdiv i32 0, 2 ; <i32> [#uses=3]
%tmp961 = getelementptr %struct.indexentry* null, i32 %tmp955, i32 0 ; <i32*> [#uses=1]
br i1 true, label %bb986, label %bb967
bb967: ; preds = %bb951
ret i32 0
bb986: ; preds = %bb951
%tmp993 = load i32* %tmp961, align 4 ; <i32> [#uses=1]
%tmp995 = icmp ugt i32 %tmp993, %tmp910 ; <i1> [#uses=2]
%tmp1002 = add i32 %tmp955, 1 ; <i32> [#uses=1]
%low.0 = select i1 %tmp995, i32 0, i32 %tmp1002 ; <i32> [#uses=1]
%high.0 = select i1 %tmp995, i32 %tmp955, i32 0 ; <i32> [#uses=1]
%tmp1006 = icmp eq i32 %low.0, %high.0 ; <i1> [#uses=1]
br i1 %tmp1006, label %UnifiedReturnBlock, label %bb951
UnifiedReturnBlock: ; preds = %bb986
ret i32 1
}