diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-17 18:44:18 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-17 18:44:18 +0000 |
| commit | 9aa6e0a134358c681cc5918ec65b1ec9726b778e (patch) | |
| tree | a738921c6cfaf78dabeffc56473fcab921ed1079 /include/llvm/CodeGen/MachineRegisterInfo.h | |
| parent | 72d9bbf11793345bee97bfe97cf954b289b12064 (diff) | |
Merge MRI::isPhysRegOrOverlapUsed() into isPhysRegUsed().
All callers of these functions really want the isPhysRegOrOverlapUsed()
functionality which also checks aliases. For historical reasons, targets
without register aliases were calling isPhysRegUsed() instead.
Change isPhysRegUsed() to also check aliases, and switch all
isPhysRegOrOverlapUsed() callers to isPhysRegUsed().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166117 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/CodeGen/MachineRegisterInfo.h')
| -rw-r--r-- | include/llvm/CodeGen/MachineRegisterInfo.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h index 670640a715..46731978fd 100644 --- a/include/llvm/CodeGen/MachineRegisterInfo.h +++ b/include/llvm/CodeGen/MachineRegisterInfo.h @@ -357,14 +357,13 @@ public: //===--------------------------------------------------------------------===// /// isPhysRegUsed - Return true if the specified register is used in this - /// function. This only works after register allocation. + /// function. Also check for clobbered aliases and registers clobbered by + /// function calls with register mask operands. + /// + /// This only works after register allocation. It is primarily used by + /// PrologEpilogInserter to determine which callee-saved registers need + /// spilling. bool isPhysRegUsed(unsigned Reg) const { - return UsedPhysRegs.test(Reg) || UsedPhysRegMask.test(Reg); - } - - /// isPhysRegOrOverlapUsed - Return true if Reg or any overlapping register - /// is used in this function. - bool isPhysRegOrOverlapUsed(unsigned Reg) const { if (UsedPhysRegMask.test(Reg)) return true; for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) |