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Allow null interference cursors to be queried.

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They always report 'no interference'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135843 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-07-23 03:10:17 +00:00
parent 59a4f9af0a
commit c7931fd725
2 changed files with 6 additions and 2 deletions
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5
lib/CodeGen/InterferenceCache.cpp
View File

@ -18,10 +18,13 @@
using namespace llvm; using namespace llvm;
// Static member used for null interference cursors.
InterferenceCache::BlockInterference InterferenceCache::Cursor::NoInterference;
void InterferenceCache::init(MachineFunction *mf, void InterferenceCache::init(MachineFunction *mf,
LiveIntervalUnion *liuarray, LiveIntervalUnion *liuarray,
SlotIndexes *indexes, SlotIndexes *indexes,
const TargetRegisterInfo *tri) { const TargetRegisterInfo *tri) {
MF = mf; MF = mf;
LIUArray = liuarray; LIUArray = liuarray;
TRI = tri; TRI = tri;

3
lib/CodeGen/InterferenceCache.h
View File

@ -138,6 +138,7 @@ public:
class Cursor { class Cursor {
Entry *CacheEntry; Entry *CacheEntry;
BlockInterference *Current; BlockInterference *Current;
static BlockInterference NoInterference;
void setEntry(Entry *E) { void setEntry(Entry *E) {
Current = 0; Current = 0;
@ -175,7 +176,7 @@ public:
/// moveTo - Move cursor to basic block MBBNum. /// moveTo - Move cursor to basic block MBBNum.
void moveToBlock(unsigned MBBNum) { void moveToBlock(unsigned MBBNum) {
Current = CacheEntry->get(MBBNum); Current = CacheEntry ? CacheEntry->get(MBBNum) : &NoInterference;
} }
/// hasInterference - Return true if the current block has any interference. /// hasInterference - Return true if the current block has any interference.