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Add MachineRegisterInfo::hasOneUse and hasOneNonDBGUse.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97663 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-03-03 21:18:38 +00:00
parent 14c85cbf54
commit 1423c70b8f
3 changed files with 24 additions and 6 deletions
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8
include/llvm/CodeGen/MachineRegisterInfo.h
View File

@ -115,6 +115,10 @@ public:
/// register.
bool use_empty(unsigned RegNo) const { return use_begin(RegNo) == use_end(); }
/// hasOneUse - Return true if there is exactly one instruction using the
/// specified register.
bool hasOneUse(unsigned RegNo) const;
/// use_nodbg_iterator/use_nodbg_begin/use_nodbg_end - Walk all uses of the
/// specified register, skipping those marked as Debug.
typedef defusechain_iterator<true,false,true> use_nodbg_iterator;
@ -129,6 +133,10 @@ public:
return use_nodbg_begin(RegNo) == use_nodbg_end();
}
/// hasOneNonDBGUse - Return true if there is exactly one non-Debug
/// instruction using the specified register.
bool hasOneNonDBGUse(unsigned RegNo) const;
/// replaceRegWith - Replace all instances of FromReg with ToReg in the
/// machine function. This is like llvm-level X->replaceAllUsesWith(Y),
/// except that it also changes any definitions of the register as well.

13
lib/CodeGen/MachineRegisterInfo.cpp
View File

@ -116,6 +116,19 @@ MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
return 0;
}
bool MachineRegisterInfo::hasOneUse(unsigned RegNo) const {
use_iterator UI = use_begin(RegNo);
if (UI == use_end())
return false;
return ++UI == use_end();
}
bool MachineRegisterInfo::hasOneNonDBGUse(unsigned RegNo) const {
use_nodbg_iterator UI = use_nodbg_begin(RegNo);
if (UI == use_nodbg_end())
return false;
return ++UI == use_nodbg_end();
}
#ifndef NDEBUG
void MachineRegisterInfo::dumpUses(unsigned Reg) const {

9
lib/CodeGen/TwoAddressInstructionPass.cpp
View File

@ -454,13 +454,10 @@ MachineInstr *findOnlyInterestingUse(unsigned Reg, MachineBasicBlock *MBB,
const TargetInstrInfo *TII,
bool &IsCopy,
unsigned &DstReg, bool &IsDstPhys) {
MachineRegisterInfo::use_nodbg_iterator UI = MRI->use_nodbg_begin(Reg);
if (UI == MRI->use_nodbg_end())
return 0;
MachineInstr &UseMI = *UI;
if (++UI != MRI->use_nodbg_end())
// More than one use.
if (!MRI->hasOneNonDBGUse(Reg))
// None or more than one use.
return 0;
MachineInstr &UseMI = *MRI->use_nodbg_begin(Reg);
if (UseMI.getParent() != MBB)
return 0;
unsigned SrcReg;