[LLVMdev] Increasing TargetRegisterInfo::FirstVirtualRegister?

[Jakob Stoklund Olesen]

On Jan 9, 2011, at 3:15 PM, Jakob Stoklund Olesen wrote:

> So I moved the virtual register range to 2^31 growing upwards.

Note that this allows the index translation in an IndexedMap to be optimized away completely in 32-bit builds.

MachineRegisterInfo::setRegClass(unsigned Reg, const TargetRegisterClass *RC) {
  const TargetRegisterClass *OldRC = VRegInfo[Reg].first;

Becomes:

movl		12(%ebp), %esi 
movl		8(%ebp), %eax
movl		(%eax), %ecx
movl		(%ecx,%esi,8), %edx

The high bit on the virtual register number falls off in the address computation.

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