Displaying 3 results from an estimated 3 matches for "adcreg".
2010 Jan 04
5
[LLVMdev] How to bind a register variable with a given general purpose register?
Hi everyone,
There are 16 GPRs in my RISC, but in fact GPR13 is read-only and connected
to output of an A/D converter.
It would be very convenient if i could bind a register variable with GPR13.
Because i am a newbie i don't know how my llvm backend can support that.
I plan to implement it as below.
A. first declare a global variable in c-code
int ADC asm("GPR13");
B. If
2010 Jan 04
0
[LLVMdev] 答复: [LLVMdev] How to bind a register variable with a given general purpose register?
hi zhu,
i am not sure if your c frontend support "int ADC asm("GPR13");"
i think you could:
1. add a attribute "GPR13"(or a more meaningful name like "adcreg") and
the corresponding handler, so you code "int ADC asm("GPR13");" became
"int ADC __attribute__((GPR13));"
2. add a intrinsic functions like "llvm.zhu.readadcreg()".
3. map any read to the variable marked with __attribute__((GPR13)) to
llvm.zhu.readad...
2010 Jan 04
0
[LLVMdev] 答复: 答复: [LLVMdev] How to bind a register variable with a given general purpose register?
or you can just add a built-in function in c frontend "readadcreg()" and
emit it as llvm.zhu.readadcreg(), so you can just call the built-in
function to get the adc register value.
On 2010-1-4 21:27, Demon(Xiangyang) Zhu 朱向阳 wrote:
> Hi Ether,
>
> Thank you very much. I will try it soon as your description.
>
> Regards
>
> _____________...