Displaying 3 results from an estimated 3 matches for "instrinisic".
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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?
....readadcreg()".
3. map any read to the variable marked with __attribute__((GPR13)) to
llvm.zhu.readadcreg() instead of "load" instruction
4. assign gpr13 to a special register class like "gpr13class" instead of
gprclass, so gpr13 will not be allocated as other gpr.
5. lower instrinisic functions "llvm.zhu.readadcreg()" to register node
"gpr13" in your backend.
regards
--ether
On 2010-1-4 18:01, Demon(Xiangyang) Zhu 朱向阳 wrote:
> Hi Ether,
>
> The hardware had been fixed now.
> If map it to memory space, it will cost another instruction cycle to...
2010 Jan 04
0
[LLVMdev] 答复: 答复: [LLVMdev] How to bind a register variable with a given general purpose register?
...3. map any read to the variable marked with __attribute__((GPR13)) to
> llvm.zhu.readadcreg() instead of "load" instruction
> 4. assign gpr13 to a special register class like "gpr13class" instead of
> gprclass, so gpr13 will not be allocated as other gpr.
> 5. lower instrinisic functions "llvm.zhu.readadcreg()" to register node
> "gpr13" in your backend.
>
> regards
>
> --ether
>
> On 2010-1-4 18:01, Demon(Xiangyang) Zhu 朱向阳 wrote:
>
>> Hi Ether,
>>
>> The hardware had been fixed now.
>> If map it to m...