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Add a static MachineOperand::clobbersPhysReg().

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It can be necessary to detach a register mask pointer from its
MachineOperand. This method is convenient for checking clobbered
physregs on a detached bitmask pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-02-10 19:23:53 +00:00
parent 6ef7da0197
commit 938200859e
2 changed files with 14 additions and 11 deletions
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16
include/llvm/CodeGen/MachineOperand.h
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@@ -441,12 +441,20 @@ public:
return Contents.OffsetedInfo.Val.SymbolName;
}
/// clobbersPhysReg - Returns true if this RegMask operand clobbers PhysReg.
bool clobbersPhysReg(unsigned PhysReg) const {
assert(isRegMask() && "Wrong MachineOperand accessor");
/// clobbersPhysReg - Returns true if this RegMask clobbers PhysReg.
/// It is sometimes necessary to detach the register mask pointer from its
/// machine operand. This static method can be used for such detached bit
/// mask pointers. clobbersPhysReg - Returns true if this RegMask operand
/// clobbers PhysReg.
static bool clobbersPhysReg(const uint32_t *RegMask, unsigned PhysReg) {
// See TargetRegisterInfo.h.
assert(PhysReg < (1u << 30) && "Not a physical register");
return !(Contents.RegMask[PhysReg / 32] & (1u << PhysReg % 32));
return !(RegMask[PhysReg / 32] & (1u << PhysReg % 32));
}
/// clobbersPhysReg - Returns true if this RegMask operand clobbers PhysReg.
bool clobbersPhysReg(unsigned PhysReg) const {
return clobbersPhysReg(getRegMask(), PhysReg);
}
/// getRegMask - Returns a bit mask of registers preserved by this RegMask