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Add empty() methods for register def lists.

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llvm-svn: 61890
This commit is contained in:
Dan Gohman 2009-01-07 22:28:56 +00:00
parent c3fe8ccf6d
commit ea82309aa7
1 changed files with 8 additions and 0 deletions
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8
include/llvm/CodeGen/MachineRegisterInfo.h
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@ -81,6 +81,10 @@ public:
} }
static reg_iterator reg_end() { return reg_iterator(0); } static reg_iterator reg_end() { return reg_iterator(0); }
/// reg_empty - Return true if there are no instructions using or defining the
/// specified register (it may be live-in).
bool reg_empty(unsigned RegNo) const { return reg_begin(RegNo) == reg_end(); }
/// def_iterator/def_begin/def_end - Walk all defs of the specified register. /// def_iterator/def_begin/def_end - Walk all defs of the specified register.
typedef defusechain_iterator<false,true> def_iterator; typedef defusechain_iterator<false,true> def_iterator;
def_iterator def_begin(unsigned RegNo) const { def_iterator def_begin(unsigned RegNo) const {
@ -88,6 +92,10 @@ public:
} }
static def_iterator def_end() { return def_iterator(0); } static def_iterator def_end() { return def_iterator(0); }
/// def_empty - Return true if there are no instructions defining the
/// specified register (it may be live-in).
bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); }
/// use_iterator/use_begin/use_end - Walk all uses of the specified register. /// use_iterator/use_begin/use_end - Walk all uses of the specified register.
typedef defusechain_iterator<true,false> use_iterator; typedef defusechain_iterator<true,false> use_iterator;
use_iterator use_begin(unsigned RegNo) const { use_iterator use_begin(unsigned RegNo) const {