Shrink MachineOperand from 40 to 32 bytes on 64-bit hosts.
Pull an unsigned out of the Contents union such that it has the same size as two
pointers and no padding.
Arrange members such that the Contents union and all pointers can be 8-byte
aligned without padding.
This speeds up code generation by 0.8% on a 64-bit host. 32-bit hosts should be
unaffected.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116857 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index d30e3c9..af714d5 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -102,13 +102,13 @@
if (MachineBasicBlock *MBB = MI->getParent())
if (MachineFunction *MF = MBB->getParent()) {
RemoveRegOperandFromRegInfo();
- Contents.Reg.RegNo = Reg;
+ SmallContents.RegNo = Reg;
AddRegOperandToRegInfo(&MF->getRegInfo());
return;
}
// Otherwise, just change the register, no problem. :)
- Contents.Reg.RegNo = Reg;
+ SmallContents.RegNo = Reg;
}
void MachineOperand::substVirtReg(unsigned Reg, unsigned SubIdx,
@@ -159,7 +159,7 @@
} else {
// Otherwise, change this to a register and set the reg#.
OpKind = MO_Register;
- Contents.Reg.RegNo = Reg;
+ SmallContents.RegNo = Reg;
// If this operand is embedded in a function, add the operand to the
// register's use/def list.