CodeGen: Cleanup regmask construction; NFC

- Avoid duplication of regmask size calculation.
- Simplify allocateRegisterMask() call.
- Rename allocateRegisterMask() to allocateRegMask() to be consistent
  with naming in MachineOperand.

llvm-svn: 337986

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
index a376614ade9..dd668bcf619 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -486,6 +486,14 @@ const char *MachineFunction::createExternalSymbolName(StringRef Name) {
   return Dest;
 }
 
+uint32_t *MachineFunction::allocateRegMask() {
+  unsigned NumRegs = getSubtarget().getRegisterInfo()->getNumRegs();
+  unsigned Size = MachineOperand::getRegMaskSize(NumRegs);
+  uint32_t *Mask = Allocator.Allocate<uint32_t>(Size);
+  memset(Mask, 0, Size * sizeof(Mask[0]));
+  return Mask;
+}
+
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 LLVM_DUMP_METHOD void MachineFunction::dump() const {
   print(dbgs());