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Added MachineRegisterInfo::hasOneDef() 

llvm-svn: 161009
This commit is contained in:
Andrew Trick 2012-07-30 23:48:14 +00:00
parent 7f78227ce9
commit 79df0de4fc
1 changed files with 9 additions and 0 deletions
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9
llvm/include/llvm/CodeGen/MachineRegisterInfo.h
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@ -172,6 +172,15 @@ public:
/// specified register (it may be live-in).
bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); }
/// hasOneDef - Return true if there is exactly one instruction defining the
/// specified register.
bool hasOneDef(unsigned RegNo) const {
def_iterator DI = def_begin(RegNo);
if (DI == def_end())
return false;
return ++DI == def_end();
}
/// use_iterator/use_begin/use_end - Walk all uses of the specified register.
typedef defusechain_iterator<true,false,false> use_iterator;
use_iterator use_begin(unsigned RegNo) const {