[LLVMdev] problem trying to write an LLVM register-allocation pass
lhames at gmail.com
Thu Nov 15 11:45:15 PST 2012
Jakob just pointed me to 'MachineOperand::substPhysReg(unsigned preg, const
TargetRegisterInfo& TRI)'. That substitutes the given physreg for a virtreg
operand, taking the subregister index into account. That is what my
examples have been doing manually. Using substPhysReg would allow you to
tidy the Gcra code up slightly.
On Thu, Nov 15, 2012 at 11:21 AM, Lang Hames <lhames at gmail.com> wrote:
> Thanks Jakob. I should have mentioned that earlier. :)
> When you see mismatched sizes on operands it's a fair bet that the subreg
> rewriting has gone wrong. I should have pulled that entirely out of the
> preg search loop in the previous example.
> Fixed version attached.
> - Lang.
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