Part 1.

- Change register allocation hint to a pair of unsigned integers. The hint type is zero (which means prefer the register specified as second part of the pair) or entirely target dependent.
- Allow targets to specify alternative register allocation orders based on allocation hint.

Part 2.
- Use the register allocation hint system to implement more aggressive load / store multiple formation.
- Aggressively form LDRD / STRD. These are formed *before* register allocation. It has to be done this way to shorten live interval of base and offset registers. e.g.
v1025 = LDR v1024, 0
v1026 = LDR v1024, 0
=>
v1025,v1026 = LDRD v1024, 0

If this transformation isn't done before allocation, v1024 will overlap v1025 which means it more difficult to allocate a register pair.

- Even with the register allocation hint, it may not be possible to get the desired allocation. In that case, the post-allocation load / store multiple pass must fix the ldrd / strd instructions. They can either become ldm / stm instructions or back to a pair of ldr / str instructions.

This is work in progress, not yet enabled.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73381 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMCodeEmitter.cpp

@@ -900,6 +900,10 @@ void Emitter<CodeEmitter>::emitMiscLoadStoreInstruction(const MachineInstr &MI,
   // Set first operand
   Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
 
+  // Skip LDRD and STRD's second operand.
+  if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
+    ++OpIdx;
+
   // Set second operand
   if (ImplicitRn)
     // Special handling for implicit use (e.g. PC).