[LLVMdev] Assertion failed after my storeRegToStackSlot/loadFromStackSlot

Lang Hames lhames at gmail.com
Sun Mar 3 20:24:17 PST 2013

Hi Dmitriy,

As you've seen our current spill code assumes that spill/reloads are single
instructions. I think the best way to work around this is to introduce
load/store pseudo-instructions and expand these after register allocation.


On Sat, Feb 23, 2013 at 12:15 AM, Dmitriy Limonov <earl at excluzive.ws> wrote:

> Hi All.
> I'm writing storeRegToStackSlot and loadFromStackSlot function for my
> Target. This Target can store/load one byte (not all word) from FrameIndex.
> If I need to store 16 bit register I will must to split it to two
> instruction like this:
> BuildMI(MBB, MI, dl, get(Z80::LD8xmr))
>   .addFrameIndex(FrameIndex).**addImm(0)
>   .addReg(SrcReg, 0, Z80::subreg_lo);
> BuildMI(MBB, MI, dl, get(Z80::LD8xmr))
>   .addFrameIndex(FrameIndex).**addImm(1)
>   .addReg(SrcReg, getKillRegState(isKill), Z80::subreg_hi);
> After this store I catch assertion failed: "Instruction not found in
> maps", because only last of this instruction added in Instruction maps.
> How can I avoid assertion failed in this case?
> Best regards, Dmitriy.
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