MachineRegisterInfo: Remove UsedPhysReg infrastructure

We have a detailed def/use lists for every physical register in
MachineRegisterInfo anyway, so there is little use in maintaining an
additional bitset of which ones are used.

Removing it frees us from extra book keeping. This simplifies
VirtRegMap.

Differential Revision: http://reviews.llvm.org/D10911

llvm-svn: 242173

1 files changed, 0 insertions, 2 deletions

diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index 3a21b57f015..2a35c4cf31f 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -1682,8 +1682,6 @@ void X86FrameLowering::adjustForSegmentedStacks(
       .addImm(StackSize);
     BuildMI(allocMBB, DL, TII.get(MOVri), Reg11)
       .addImm(X86FI->getArgumentStackSize());
-    MF.getRegInfo().setPhysRegUsed(Reg10);
-    MF.getRegInfo().setPhysRegUsed(Reg11);
   } else {
     BuildMI(allocMBB, DL, TII.get(X86::PUSHi32))
       .addImm(X86FI->getArgumentStackSize());